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Hussein Patwa

2007-Jun-07 19:22 UTC

Rake Migrate failing - but can''t find syntax errors

Hello,

I''m following a guide on creating a migration, but the migrate is
failing due to the following errors:

Line 7: Unexpected ''\n'' expecting tCOLON2 or
''{'' or ''.''
Line 14: $END expecting KEND

But I can''t find any mistakes.

Any help appreciated.

I use sometimes notepad and sometimes crimson editor for my programming
development.  If there''s a better editor that would not cause these
problems (as they don''t seem to be typing erors) I''d
appreciate the
help.

I pasted this straight from Crimson Editor:

class CreatePosts < ActiveRecord::Migration
def self.up
create_table :posts do |t|
t.column :title, :string
t.column :body, :text
t.column :created_at, :string
t.lock_version, :integer
end
end

def self.down
drop_table :posts
end
end

H.

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Mel Riffe

2007-Jun-07 19:33 UTC

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Re: Rake Migrate failing - but can''t find syntax errors

This looks strange => t.lock_version, :integer

Is the comma needed?

I''m learning too and have never used t.lock_version.

-Mel


On 6/7/07, Hussein Patwa
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> Hello,
>
> I''m following a guide on creating a migration, but the migrate is
> failing due to the following errors:
>
> Line 7: Unexpected ''\n'' expecting tCOLON2 or
''{'' or ''.''
> Line 14: $END expecting KEND
>
> But I can''t find any mistakes.
>
> Any help appreciated.
>
> I use sometimes notepad and sometimes crimson editor for my programming
> development.  If there''s a better editor that would not cause
these
> problems (as they don''t seem to be typing erors) I''d
appreciate the
> help.
>
> I pasted this straight from Crimson Editor:
>
> class CreatePosts < ActiveRecord::Migration
> def self.up
> create_table :posts do |t|
> t.column :title, :string
> t.column :body, :text
> t.column :created_at, :string
> t.lock_version, :integer
> end
> end
>
> def self.down
> drop_table :posts
> end
> end
>
> H.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Hussein Patwa

2007-Jun-07 22:48 UTC

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Re: Rake Migrate failing - but can''t find syntax errors

Ok, good news but at the same time bad news.

Good news is that it''s working.  I removed the lock_version statement 
after loading the file into a windows version of emacs, and also just 
removed anything after the last end statement (even though I couldn''t 
find anything) and now it migrates fine.

Bad news, I don''t know why the lock_version was having that effect, I 
found the statement through google that was supposed to be, well a 
locking mechanism to ensure the same database item couldnt be edited at 
the same time by two users.  I can only suppose it didn''t work.  Why I 
don''t know.

I hate these types of errors, particularly the $END and KEND as I don''t
know what they mean.  I don''t have any other editors than notepad, 
Editpad Pro and Crimson Editor, and iit seems that even these put hidden 
characters in that mess things up.  Any recommendations for a no 
nonsense editor would be welcome.  I do need something that is 
accessible though as I''m partially sighted, so something easy to use.

H.

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Rob Biedenharn

2007-Jun-08 00:12 UTC

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Re: Rake Migrate failing - but can''t find syntax errors

On Jun 7, 2007, at 6:48 PM, Hussein Patwa wrote:> I hate these types of errors, particularly the $END and KEND as I  
> don''t
> know what they mean.  I don''t have any other editors than notepad,
> Editpad Pro and Crimson Editor, and iit seems that even these put  
> hidden
> characters in that mess things up.  Any recommendations for a no
> nonsense editor would be welcome.  I do need something that is
> accessible though as I''m partially sighted, so something easy to
use.
>
> H.
These are tokens from the parser:  kSOMETHING usually means that a  
token that looks like something is involved, in this case kEND is the  
"end" of some block/loop/if construct.  The $ (or $END) often means  
the end of the file.  They''re not literally "$END" or
"kEND" in the
source so your editor will do just fine.

-Rob


Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org



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Chris Gernon

2007-Jun-08 14:34 UTC

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Re: Rake Migrate failing - but can''t find syntax errors

> t.lock_version, :integer
This is definitely the problem. I believe you meant:

t.column lock_version, :integer

However, please don''t add this without actually understanding
optimistic
locking. It won''t automatically take care of everything involved with
making sure two people aren''t editing a record at the same time - it
just causes an ActiveRecord::StaleObjectError when trying to save the
record if it has changed since the user loaded it. Your application
still has to handle that error.

For more information:
http://api.rubyonrails.com/classes/ActiveRecord/Locking/Optimistic.html
http://wiki.rubyonrails.org/rails/pages/MagicFieldNames
http://www.ruby-forum.com/topic/61754

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Mel Riffe

2007-Jun-08 14:41 UTC

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Re: Rake Migrate failing - but can''t find syntax errors

Thanks Chris for clearing that up - at least for me.

--Mel


On 6/8/07, Chris Gernon
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> > t.lock_version, :integer
>
> This is definitely the problem. I believe you meant:
>
> t.column lock_version, :integer
>
> However, please don''t add this without actually understanding
optimistic
> locking. It won''t automatically take care of everything involved
with
> making sure two people aren''t editing a record at the same time -
it
> just causes an ActiveRecord::StaleObjectError when trying to save the
> record if it has changed since the user loaded it. Your application
> still has to handle that error.
>
> For more information:
> http://api.rubyonrails.com/classes/ActiveRecord/Locking/Optimistic.html
> http://wiki.rubyonrails.org/rails/pages/MagicFieldNames
> http://www.ruby-forum.com/topic/61754
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Rails - Jun 2007 - Rake Migrate failing - but can't find syntax errors

Rake Migrate failing - but can''t find syntax errors

Re: Rake Migrate failing - but can''t find syntax errors

Re: Rake Migrate failing - but can''t find syntax errors

Re: Rake Migrate failing - but can''t find syntax errors

Re: Rake Migrate failing - but can''t find syntax errors

Re: Rake Migrate failing - but can''t find syntax errors