Hi Guys First time on the list and pretty new to the rails way of doing things, yup I know sorry.. another newbie! anyway, apologies out of the way, this is the problem I am having... I have purchased the "Agile Development with Rails" book and have just started running through the ''Depot'' demo application. I have got to page 57... I have my project files all set up in Textmate, I have the databases setup, with a table called products in depot_development ready to go with all the right fields in it. I have changed my passwords using OLDPASSWORD command (i recieved the errors described in the book until i did this) but when I run "ruby script/generate scaffold Product Admin" from with in my depot directory as instructed I get the following error ... You have a nil object when you didn''t expect it! You might have expected an instance of Array. The error occured while evaluating nil.each now I have searched and searched for why this should be... and looked at the errata ... no joy :( ... what exactly is the error trying to tell me? I kind of get the idea that it is saying that files are missing.. but i thought that is what the "generate scaffold" command was going to do? please, any help that anyone can offer would be greatly appreciated. go easy on the new guy please hehehe 3Quid email - threequid@gmail.com ----------------------------------- msn - threequid@gmail.com aim - threequid@mac.com ----------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060403/1bf5d505/attachment.html
3quid wrote: <snip>> when I run "ruby script/generate scaffold Product > Admin" from with in my depot directory as > instructed I get the following error ...> You have a nil object when you didn''t expect it! > You might have expected an instance of Array. > The error occured while evaluating nil.each"ruby script\...." gets run from the command line in a Command Window. The error message is one you''d see in a browser when you''re running an app (very common error, actually). If you''d fill in the gaps, it''ll probably be a very easy fix. Best regards, Bill
Hi Bill / Everyone Thanks for replying, i am getting that error message via the command line. Don''t know if that helps diagnose what the problem is? the book doesnt mention creating any files in the app''s directory before running the command.. is it the case that I should? The only file I have edited in there is database.yml so that it can connect to MySQL. Thats all the book instructs you to do other than create the databases/tables which it said could be done in a GUI app. I used phpMyAdmin .. could this be the problem? sorry if i am being an ass :) 3Quid email - threequid@gmail.com ----------------------------------- msn - threequid@gmail.com aim - threequid@mac.com ----------------------------------- On 3 Apr 2006, at 13:47:54, Bill Walton wrote:> 3quid wrote: > <snip> > >> when I run "ruby script/generate scaffold Product >> Admin" from with in my depot directory as >> instructed I get the following error ... > >> You have a nil object when you didn''t expect it! >> You might have expected an instance of Array. >> The error occured while evaluating nil.each > > "ruby script\...." gets run from the command line in a Command > Window. The > error message is one you''d see in a browser when you''re running an > app (very > common error, actually). If you''d fill in the gaps, it''ll probably > be a > very easy fix. > > Best regards, > Bill > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060403/d7808696/attachment.html
Hi 3quid,
----- Original Message -----
From: 3quid
To: rails@lists.rubyonrails.org
Sent: 2006-04-03 8:25 AM
Subject: Re: [Rails] newbie generate scaffold
Hi Bill / Everyone
Thanks for replying, i am getting that error message via the command line.
Don''t know if that helps diagnose what the problem is?
[BW] It''s a start. Personally, I''ve never seen that at the
command line before. Makes it an interesting (to me) problem.
the book doesnt mention creating any files in the app''s directory
before running the command.. is it the case that I should? The only file I have
edited in there is database.yml so that it can connect to MySQL. Thats all the
book instructs you to do
[BW] That''s all it should take. Only additional step I''ve
seen necessary to date is, on a Windows machine, you might have to grant db
rights to the ODBC@localhost user. But that throws a whole different error.
other than create the databases/tables which it said could be done in a GUI
app. I used phpMyAdmin .. could this be the problem?
[BW] Could be. Probably not, but it''s worth ruling out. Have you
tried creating the database from the command line and tables via script?
[BW] Also, what''s your system environment? What version of RoR are
you using?
sorry if i am being an ass :)
[BW] Not at all. And, just FFR, groveling''s not required here ;-)
Best regards,
Bill
3Quid
email - threequid@gmail.com
-----------------------------------
msn - threequid@gmail.com
aim - threequid@mac.com
-----------------------------------
On 3 Apr 2006, at 13:47:54, Bill Walton wrote:
3quid wrote:
<snip>
when I run "ruby script/generate scaffold Product
Admin" from with in my depot directory as
instructed I get the following error ...
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
"ruby script\...." gets run from the command line in a Command
Window. The
error message is one you''d see in a browser when you''re
running an app (very
common error, actually). If you''d fill in the gaps, it''ll
probably be a
very easy fix.
Best regards,
Bill
_______________________________________________
Rails mailing list
Rails@lists.rubyonrails.org
http://lists.rubyonrails.org/mailman/listinfo/rails
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_______________________________________________
Rails mailing list
Rails@lists.rubyonrails.org
http://lists.rubyonrails.org/mailman/listinfo/rails
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ok noted re:grovelling! hehe yeh all the references to the error I could find referred to the browser displaying it. i have granted rights to the user that I have specified in the databse.yml file and as you say that would spit out a different error. when i get home I will try recreating the databases/table but I dont see why it would be the issue. My system is MacOSX 10.4.5, MySQL 4.1, RoR 1.1 .. (i have done the rbconfig repair that is needed for OSX10.4 Tiger) 3Quid email - threequid@gmail.com ----------------------------------- msn - threequid@gmail.com aim - threequid@mac.com ----------------------------------- On 3 Apr 2006, at 15:09:16, Bill Walton wrote:> Hi 3quid, > ----- Original Message ----- > From: 3quid > To: rails@lists.rubyonrails.org > Sent: 2006-04-03 8:25 AM > Subject: Re: [Rails] newbie generate scaffold > > Hi Bill / Everyone > > Thanks for replying, i am getting that error message via the > command line. Don''t know if that helps diagnose what the problem is? > [BW] It''s a start. Personally, I''ve never seen that at the > command line before. Makes it an interesting (to me) problem. > > > the book doesnt mention creating any files in the app''s directory > before running the command.. is it the case that I should? The only > file I have edited in there is database.yml so that it can connect > to MySQL. Thats all the book instructs you to do > > [BW] That''s all it should take. Only additional step I''ve seen > necessary to date is, on a Windows machine, you might have to grant > db rights to the ODBC@localhost user. But that throws a whole > different error. > > other than create the databases/tables which it said could be done > in a GUI app. I used phpMyAdmin .. could this be the problem? > [BW] Could be. Probably not, but it''s worth ruling out. Have you > tried creating the database from the command line and tables via > script? > > [BW] Also, what''s your system environment? What version of RoR > are you using? > > sorry if i am being an ass :) > [BW] Not at all. And, just FFR, groveling''s not required here ;-) > > Best regards, > Bill > > 3Quid > email - threequid@gmail.com > ----------------------------------- > msn - threequid@gmail.com > aim - threequid@mac.com > ----------------------------------- > > > On 3 Apr 2006, at 13:47:54, Bill Walton wrote: > >> 3quid wrote: >> <snip> >> >>> when I run "ruby script/generate scaffold Product >>> Admin" from with in my depot directory as >>> instructed I get the following error ... >> >>> You have a nil object when you didn''t expect it! >>> You might have expected an instance of Array. >>> The error occured while evaluating nil.each >> >> "ruby script\...." gets run from the command line in a Command >> Window. The >> error message is one you''d see in a browser when you''re running an >> app (very >> common error, actually). If you''d fill in the gaps, it''ll >> probably be a >> very easy fix. >> >> Best regards, >> Bill >> _______________________________________________ >> Rails mailing list >> Rails@lists.rubyonrails.org >> http://lists.rubyonrails.org/mailman/listinfo/rails > > > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060403/7ad6aa91/attachment.html
3quid wrote:> You have a nil object when you didn''t expect it! > You might have expected an instance of Array. > The error occured while evaluating nil.eachHi, Could you send the whole error ? ie is there a trace ? Adding -t to the command line will generate more output. Presumably ''script/generate model Product'' worked earlier in the utorial. Does ''script/generate controller Admin'' work ? (trying to narrow it down :-) Alan -- Posted via http://www.ruby-forum.com/.
Hi Bill/Alan/Everyone
if i run the command as mentioned before, with -t ... I get this in
return.
Alan - as far as running those other commands you suggested. I tried
them and they seem to run fine.. but I hadnt run them when i got this
output below, as the book''s tutorial doesnt mention running anything
before "ruby script/generate scaffold Product Admin" except when we
made the app using "rails depot"
very confused ... this is the output i got ...
desktop:/users/3quid/rails/depot 3quid$ ruby script/generate scaffold
Product Admin -t
exists app/controllers/
exists app/helpers/
exists app/views/admin
exists test/functional/
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
identical app/models/product.rb
identical test/unit/product_test.rb
identical test/fixtures/products.yml
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
connection_adapters/mysql_adapter.rb:293:in `columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:696:in `columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:1963:in `attributes_from_column_definition''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:1347:in `initialize_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
callbacks.rb:236:in `initialize''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:182:in `new''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:182:in
`model_instance''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:164:in
`create_sandbox''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:85:in `manifest''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:85:in `call''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:106:in `render_template_part''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:284:in `complex_template''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:47:in `send''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:47:in `send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:46:in `each''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:46:in `send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:31:in `replay''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:41:in `invoke!''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
scripts/../scripts.rb:31:in `run''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/commands/generate.rb:6
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require__''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.0/lib/active_support/
dependencies.rb:136:in `require''
script/generate:3
3Quid
email - threequid@gmail.com
-----------------------------------
msn - threequid@gmail.com
aim - threequid@mac.com
-----------------------------------
On 3 Apr 2006, at 16:36:01, Alan Francis wrote:
> 3quid wrote:
>> You have a nil object when you didn''t expect it!
>> You might have expected an instance of Array.
>> The error occured while evaluating nil.each
>
> Hi,
>
> Could you send the whole error ? ie is there a trace ? Adding -t to
> the command line will generate more output.
>
> Presumably ''script/generate model Product'' worked earlier
in the
> utorial. Does ''script/generate controller Admin'' work ?
(trying to
> narrow it down :-)
>
> Alan
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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i am getting the exact same error:
b00ty:/Library/WebServer/Documents/Rails/depot chris$ ruby
script/generate scaffold Product Admin
exists app/controllers/
exists app/helpers/
exists app/views/admin
exists test/functional/
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
identical app/models/product.rb
identical test/unit/product_test.rb
identical test/fixtures/products.yml
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
b00ty:/Library/WebServer/Documents/Rails/depot chris$
also, on page 57 of the _agile_ book.
i was getting a different error, before i uppt to 5.0 from 4.0 of MySQL,
as none of the "fixes" were fixing anything. =D
--
Posted via http://www.ruby-forum.com/.
yup i know hehe.. i replied to your post! glad (sort of) to see its
not just me!
when i add -t to the end of the scaffold command, as suggested by one
of the guys on here get the below ... does anybody know how we can
solve this problem? or any more people experiencing the same problem
with this section of the book?
desktop:/users/3quid/rails/depot 3quid$ ruby script/generate scaffold
Product Admin -t
exists app/controllers/
exists app/helpers/
exists app/views/admin
exists test/functional/
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
identical app/models/product.rb
identical test/unit/product_test.rb
identical test/fixtures/products.yml
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
connection_adapters/mysql_adapter.rb:293:in `columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:696:in `columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:1963:in `attributes_from_column_definition''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
base.rb:1347:in `initialize_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/
callbacks.rb:236:in `initialize''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:182:in `new''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:182:in
`model_instance''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:164:in
`create_sandbox''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:85:in `manifest''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
generators/components/scaffold/scaffold_generator.rb:85:in `call''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:106:in `render_template_part''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:284:in `complex_template''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:47:in `send''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:47:in `send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:46:in `each''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:46:in `send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
manifest.rb:31:in `replay''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
commands.rb:41:in `invoke!''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/
scripts/../scripts.rb:31:in `run''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/commands/generate.rb:6
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require__''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.0/lib/active_support/
dependencies.rb:136:in `require''
script/generate:3
Would appreciate any help that anyone can offer. I am pretty sure I
have updated/fixed/patched ruby, ruby gems and the mysql bindings,
unless somebody can telll from that error output that i was not
successful with some of that?
thanks
3Quid
email - threequid@gmail.com
-----------------------------------
msn - threequid@gmail.com
aim - threequid@mac.com
-----------------------------------
On 5 Apr 2006, at 06:11:25, Chris Corwin wrote:
> i am getting the exact same error:
>
> b00ty:/Library/WebServer/Documents/Rails/depot chris$ ruby
> script/generate scaffold Product Admin
> exists app/controllers/
> exists app/helpers/
> exists app/views/admin
> exists test/functional/
> dependency model
> exists app/models/
> exists test/unit/
> exists test/fixtures/
> identical app/models/product.rb
> identical test/unit/product_test.rb
> identical test/fixtures/products.yml
> You have a nil object when you didn''t expect it!
> You might have expected an instance of Array.
> The error occured while evaluating nil.each
> b00ty:/Library/WebServer/Documents/Rails/depot chris$
>
>
>
> also, on page 57 of the _agile_ book.
>
> i was getting a different error, before i uppt to 5.0 from 4.0 of
> MySQL,
> as none of the "fixes" were fixing anything. =D
>
>
>
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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Are you both working on the same platform? More info is better.
Thanks,
Bill
----- Original Message -----
From: 3quid
To: rails@lists.rubyonrails.org
Sent: 2006-04-05 2:15 AM
Subject: Re: [Rails] Re: Re: newbie generate scaffold
yup i know hehe.. i replied to your post! glad (sort of) to see its not just
me!
when i add -t to the end of the scaffold command, as suggested by one of the
guys on here get the below ... does anybody know how we can solve this problem?
or any more people experiencing the same problem with this section of the book?
desktop:/users/3quid/rails/depot 3quid$ ruby script/generate scaffold Product
Admin -t
exists app/controllers/
exists app/helpers/
exists app/views/admin
exists test/functional/
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
identical app/models/product.rb
identical test/unit/product_test.rb
identical test/fixtures/products.yml
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/connection_adapters/mysql_adapter.rb:293:in
`columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/base.rb:696:in
`columns''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/base.rb:1963:in
`attributes_from_column_definition''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/base.rb:1347:in
`initialize_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/callbacks.rb:236:in
`initialize''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/generators/components/scaffold/scaffold_generator.rb:182:in
`new''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/generators/components/scaffold/scaffold_generator.rb:182:in
`model_instance''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/generators/components/scaffold/scaffold_generator.rb:164:in
`create_sandbox''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/generators/components/scaffold/scaffold_generator.rb:85:in
`manifest''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/generators/components/scaffold/scaffold_generator.rb:85:in
`call''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/commands.rb:106:in
`render_template_part''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/commands.rb:284:in
`complex_template''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/manifest.rb:47:in
`send''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/manifest.rb:47:in
`send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/manifest.rb:46:in
`each''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/manifest.rb:46:in
`send_actions''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/manifest.rb:31:in
`replay''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/commands.rb:41:in
`invoke!''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/rails_generator/scripts/../scripts.rb:31:in
`run''
/usr/lib/ruby/gems/1.8/gems/rails-1.1.0/lib/commands/generate.rb:6
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require__''
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.0/lib/active_support/dependencies.rb:136:in
`require''
script/generate:3
Would appreciate any help that anyone can offer. I am pretty sure I have
updated/fixed/patched ruby, ruby gems and the mysql bindings, unless somebody
can telll from that error output that i was not successful with some of that?
thanks
3Quid
email - threequid@gmail.com
-----------------------------------
msn - threequid@gmail.com
aim - threequid@mac.com
-----------------------------------
On 5 Apr 2006, at 06:11:25, Chris Corwin wrote:
i am getting the exact same error:
b00ty:/Library/WebServer/Documents/Rails/depot chris$ ruby
script/generate scaffold Product Admin
exists app/controllers/
exists app/helpers/
exists app/views/admin
exists test/functional/
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
identical app/models/product.rb
identical test/unit/product_test.rb
identical test/fixtures/products.yml
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
b00ty:/Library/WebServer/Documents/Rails/depot chris$
also, on page 57 of the _agile_ book.
i was getting a different error, before i uppt to 5.0 from 4.0 of MySQL,
as none of the "fixes" were fixing anything. =D
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3quid wrote:> yup i know hehe.. i replied to your post! glad (sort of) to see its > not just me! > > when i add -t to the end of the scaffold command, as suggested by one > of the guys on here get the below ... does anybody know how we can > solve this problem? or any more people experiencing the same problem > with this section of the book? >The -t will probably need to either after ''generate'' or after ''scaffold'' as it''s a flag. You''d do ''ls -l dirname'' rather than ''ls dirname -l'', I''m guessing script/generate scaffold -t args.... works for me. A. -- Posted via http://www.ruby-forum.com/.
Oops, hold on, it did work anyway as you got the full trace :-)
Some thoughts.
The line where the failure occurs is trying to retrieve the column
definition for Product. - "SHOW FIELDS FROM #{table_name}" This
happens
when the generator tries to call Product.new
Can you show me the SQL and/or migration you''re using for the products
table ?
Also, fire up mysql from the command line.
mysql -u root
use depot_development;
show tables;
show fields from products;
does the table exist ?
If you start script/console, and type:
Product.new
does it work ?
I note that this section of the book is immedately after altering the
sql file to recreate the products table. Perhaps this didn''t work as
expected ?
A.
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Alan Francis wrote:> I note that this section of the book is immedately after altering the > sql file to recreate the products table. Perhaps this didn''t work as > expected ?Perhaps the drop worked, but the create failed for some reason... -- Posted via http://www.ruby-forum.com/.
ok i will try that when i get home.. i know for a fact that the table is there as i checked using phpMyAdmin but haven''t looked at the table using the command line. script/console ? is that from mySQL or is that from my RoR app directory? (sorry that is probably a stupid question!) 3Quid email - threequid@gmail.com ----------------------------------- msn - threequid@gmail.com aim - threequid@mac.com ----------------------------------- On 5 Apr 2006, at 13:45:25, Alan Francis wrote:> Oops, hold on, it did work anyway as you got the full trace :-) > > Some thoughts. > > The line where the failure occurs is trying to retrieve the column > definition for Product. - "SHOW FIELDS FROM #{table_name}" This > happens > when the generator tries to call Product.new > > Can you show me the SQL and/or migration you''re using for the products > table ? > > Also, fire up mysql from the command line. > > mysql -u root > use depot_development; > show tables; > show fields from products; > > does the table exist ? > > If you start script/console, and type: > > Product.new > > does it work ? > > I note that this section of the book is immedately after altering the > sql file to recreate the products table. Perhaps this didn''t work as > expected ? > > A. > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060405/df82aafc/attachment-0001.html
3quid wrote:> ok i will try that when i get home.. > > i know for a fact that the table is there as i checked using > phpMyAdmin but haven''t looked at the table using the command line. > > script/console ? is that from mySQL or is that from my RoR app > directory? (sorry that is probably a stupid question!) >In your RAILS root, where you run script/generate from, run scriptconsole instead. This gives you an interactive session where you can play with your models/database. You can do, for example, "Product.find(:all)" ''quit'' to quit :-) A. -- Posted via http://www.ruby-forum.com/.
FYI script/console can be tough to get working on OSX, if you have trouble with that you may try running your Product unit test which would effectively tell you the same thing (whether Rails can connect to MySQL, and is your Product model sane) Create an empty test database with the correct name and edit your config/database.yml then try the command: rake clone_structure_to_test If that works, you know you can connect. Then try: ruby test/unit/product_test.rb If that works then everything is probably inline for your model. If that doesn''t find the problem, you may want to generate a new rails app to mess around with see if you can generate models and controllers in the new app. Also which version of Ruby are you running (ruby-v), should be at least: ruby 1.8.4 (2005-12-24) [powerpc-darwin7.9.0] jeff On 4/5/06, Alan Francis <alancfrancis@gmail.com> wrote:> 3quid wrote: > > ok i will try that when i get home.. > > > > i know for a fact that the table is there as i checked using > > phpMyAdmin but haven''t looked at the table using the command line. > > > > script/console ? is that from mySQL or is that from my RoR app > > directory? (sorry that is probably a stupid question!) > > > > In your RAILS root, where you run script/generate from, run > scriptconsole instead. This gives you an interactive session where you > can play with your models/database. > > You can do, for example, "Product.find(:all)" > > ''quit'' to quit :-) > > A. > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >
> mysql -u root > use depot_development; > show tables; > show fields from products; > > does the table exist ?yes that all worked fine, database, tables and fields all present and correct.> If you start script/console, and type: > > Product.new > > does it work ?desktop:/users/3quid/Rails/depot 3quid$ script/console Loading development environment. >> Product.new NoMethodError: You have a nil object when you didn''t expect it! You might have expected an instance of Array. The error occured while evaluating nil.each from /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/ active_record/connection_adapters/mysql_adapter.rb:293:in `columns'' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/ active_record/base.rb:696:in `columns'' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/ active_record/base.rb:1963:in `attributes_from_column_definition'' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/ active_record/base.rb:1347:in `initialize_without_callbacks'' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/ active_record/callbacks.rb:236:in `initialize'' from (irb):1:in `new'' from (irb):1 >> thats as far as it gets.> Can you show me the SQL and/or migration you''re using for the products > table ?this is in db/migrate/001_create_products.rb .... class CreateProducts < ActiveRecord::Migration def self.up create_table :products do |t| # t.column :name, :string end end def self.down drop_table :products end end this is the MySQL i used to create the tables in the first place drop table if exists products; create table products ( id int not null auto_increment, title varchar(100) not null, description text not null, image_url varchar(200) not null, price decimal(10,2) not null, primary key (id) ); thanks for your help dude.. i am pretty confused hehe 3Quid email - threequid@gmail.com ----------------------------------- msn - threequid@gmail.com aim - threequid@mac.com ----------------------------------- On 5 Apr 2006, at 13:45:25, Alan Francis wrote:> If you start script/console, and type: > > Product.new > > does it work ?-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060405/e6365689/attachment-0001.html
3quid wrote:> yes that all worked fine, database, tables and fields all present and > correct.Okay. Weird. I was kind of hoping it wouldn''t :-) What does your database.yml look like ?>> Product.new >> >> does it work ? > > desktop:/users/3quid/Rails/depot 3quid$ script/console > Loading development environment. > >> Product.new > NoMethodError: You have a nil object when you didn''t expect it! > You might have expected an instance of Array. > The error occured while evaluating nil.each> thats as far as it gets.Hmmm. That''s DEFINITELY suggesting that the table exists but has no columns.> >> Can you show me the SQL and/or migration you''re using for the products >> table ?Okay the migration was created automatically, and if you''re just following the tutorial, probably isn''t being used.> this is the MySQL i used to create the tables in the first place > > drop table if exists products; > create table products ( > id int not null auto_increment, > title varchar(100) not null, > description text not null, > image_url varchar(200) not null, > price decimal(10,2) not null, > primary key (id) > ); > > thanks for your help dude.. i am pretty confused heheI can''t see anything wrong there :-( grrr. So lets try this, a new rails app. $ rails mynewapp $ cd mynewapp $ mysqladmin -u root create mynewapp_development; $ script/generate model Product <edit db/migration/001_create_product.rb> <remove the # from the # t.column :name, :string line and quit> $ rake migrate $ script/generate scaffold Product Admin That''ll use migrations rather than the raw sql to create the (much simplified table). Let me know how you get on :-) Alan A. -- Posted via http://www.ruby-forum.com/.
On 4/3/06, 3quid <threequid@gmail.com> wrote:> Hi Guys > > First time on the list and pretty new to the rails way of doing things, yup > I know sorry.. another newbie! > > anyway, apologies out of the way, this is the problem I am having... > > I have purchased the "Agile Development with Rails" book and have just > started running through the ''Depot'' demo application. > > I have got to page 57... > > I have my project files all set up in Textmate, I have the databases setup, > with a table called products in depot_development ready to go with all the > right fields in it. I have changed my passwords using OLDPASSWORD command (i > recieved the errors described in the book until i did this) but when I run > "ruby script/generate scaffold Product Admin" from with in my depot > directory as instructed I get the following error ... > > You have a nil object when you didn''t expect it! > You might have expected an instance of Array. > The error occured while evaluating nil.eachHi. Can you run ''show tables;'' from the mysql prompt (after selecting your database) and then ''desc products;''? After that (assuming they work) try: ruby script/console>> ActiveRecord::Base.connection.execute("SHOW FIELDS FROM products")You should get a Mysql::Result back. The stack traces you posted indicate that this is specifically what''s failing, so if you can narrow it down to this one code snippet it might help get to the bottom of the problem. -- Chad Fowler http://chadfowler.com http://pragmaticprogrammer.com/titles/fr_rr/ (Rails Recipes - In Beta!) http://pragmaticprogrammer.com/titles/mjwti/ (My Job Went to India, and All I Got Was This Lousy Book) http://rubycentral.org http://rubygarden.org http://rubygems.rubyforge.org (over three million gems served!)