Hi,
I am writing some simple upload functionality for an application. I
can''t figure out how to check if file@field is empty. Currently I am
trying to use an if statement, so the post action will only occure if
''upload'' is not nil. I have also tried using the .blank method
with no
success.
Any advice would be great.
Thanks in advance,
Jen.
If statement:
#posts to the data model.
if !:upload.nil?
post = Upload.save(params[:upload])
puts "file uploaded"
render ''upload''
repo.commit_all(''params[:message]'')
else
redirect_to ''upload''
end
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On 21 June 2011 13:31, Jen <jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> Hi, > I am writing some simple upload functionality for an application. I can''t > figure out how to check if file@field is empty. Currently I am trying to use > an if statement, so the post action will only occure if ''upload'' is not nil. > I have also tried using the .blank method with no success. > > Any advice would be great. > Thanks in advance, > Jen. > > If statement: > #posts to the data model. > if !:upload.nil?Are you trying to check whether param[:upload] has a value? Is so then you can use if !params[:upload].blank? blank? returns true for nil or an empty string. nil? returns true for nil but false for empty string. Colin> post = Upload.save(params[:upload]) > puts "file uploaded" > render ''upload'' > repo.commit_all(''params[:message]'') > else > redirect_to ''upload'' > end > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > >-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
It would be better to delegate that job to Upload model. Then you could write something like this: #posts to the data model. post = Upload.new(params[:upload]) if post.save puts "file uploaded" render ''upload'' repo.commit_all(params[:message]) else redirect_to ''upload'' end -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/74m04USkgCsJ. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Hi, I have been experimenting with the code from the replies to this post so far, but still can''t achieve what I want. If a file is selected it is uploaded just fine. However if no file is selected the application spits out the following error: NoMethodError in UploadController#create undefined method `original_filename'' for nil:NilClass |Rails.root: /home/resource_portal/website| Application Trace <http://localhost:3000/upload#> | Framework Trace <http://localhost:3000/upload#> | Full Trace <http://localhost:3000/upload#> |rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'' app/models/upload.rb:13:in `save'' app/controllers/upload_controller.rb:13:in `create'' rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/implicit_render.rb:4:in `send_action'' rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in `process_action'' rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/rendering.rb:11:in `process_action'' | ... I''m guessing I therefore need to be able to validate whether there is something in ''file_field'' before the post action happens, but I''m not sure how to do this. Any other suggestions would be great! Also Now I''m confused about the best place for this code to go. I was originally just putting one if statement in my controller, but as this is validation I guess it should go in the model. I should probably also point out that files are not being stored in a database. Instead I am using GIT to version them and keep track of their history. My current code is attached. Thanks, Jen. On 21/06/11 13:46, Chirag Singhal wrote:> It would be better to delegate that job to Upload model. > Then you could write something like this: > > #posts to the data model. > post = Upload.new(params[:upload]) > if post.save > puts "file uploaded" > render ''upload'' > repo.commit_all(params[:message]) > else > redirect_to ''upload'' > end > -- > You received this message because you are subscribed to the Google > Groups "Ruby on Rails: Talk" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/rubyonrails-talk/-/74m04USkgCsJ. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en.-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On 21 June 2011 19:14, Jen <jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> Hi, > I have been experimenting with the code from the replies to this post so > far, but still can''t achieve what I want. If a file is selected it is > uploaded just fine. However if no file is selected the application spits out > the following error: > NoMethodError in UploadController#create > > undefined method `original_filename'' for nil:NilClass > > Rails.root: /home/resource_portal/website > > Application Trace | Framework Trace | Full Trace > > rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in > `method_missing'' > app/models/upload.rb:13:in `save'' > app/controllers/upload_controller.rb:13:in `create''You said that you have taken note of the previous replies, but looking at the code in upload_controller.rb you have not tested params[:upload] before calling Upload.save in the create action, which was the point of your original question I think. As I previously suggested you need to use something like if !params[:upload].blank? to prevent save being called when params[:upload] is nil or empty. What else you need to do in that action when it is empty I do not know as I do not know the details of what you want to achieve. Colin> rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/implicit_render.rb:4:in > `send_action'' > rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in > `process_action'' > rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/rendering.rb:11:in > `process_action'' > > ... > > I''m guessing I therefore need to be able to validate whether there is > something in ''file_field'' before the post action happens, but I''m not sure > how to do this. Any other suggestions would be great! > > Also Now I''m confused about the best place for this code to go. I was > originally just putting one if statement in my controller, but as this is > validation I guess it should go in the model. > > I should probably also point out that files are not being stored in a > database. Instead I am using GIT to version them and keep track of their > history. > My current code is attached. > > Thanks, > Jen. > > > On 21/06/11 13:46, Chirag Singhal wrote: > > It would be better to delegate that job to Upload model. > Then you could write something like this: > #posts to the data model. > post = Upload.new(params[:upload]) > if post.save > puts "file uploaded" > render ''upload'' > repo.commit_all(params[:message]) > else > redirect_to ''upload'' > end > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/rubyonrails-talk/-/74m04USkgCsJ. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. >-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Hi Colin,
I did try implementing your suggestion in a previous experiment, which
game me the same result. If I click the ''save upload'' button
and have
not selected a file to upload the application falls over with the same
error as in my previous post. I need some way of checking whether
file_field is blank, and if it is prompting the user to select a file.
I am not sure where in the process of attempting to submit a file this
check needs to happen, though I assume it is before the post occurs.
If this explanation is not clear enough please let me know and I will
attempt to explain it better.
I am not sure if the fact that I am not using a database impacts on
this. As stated in my previous post the files are uploaded to a
directory, then committed to a git repo.
Thanks in advance for any further help,
Jen.
Note the code below does work, as long as a file is selected for upload.
Controller code:
def create
repo =
Grit::Repo.new("/home/resource_portal/website/public/data/upload")
if !params[:upload].blank?
#posts to the data model.
post = Upload.save(params[:upload]), (params[:message])
puts "file uploaded"
repo.commit_all(:message)
render ''upload''
else
flash.now[:error] = "Please select a file to upload"
redirect_to ''upload''
end
end
end
On 21/06/11 20:26, Colin Law wrote:> On 21 June 2011 19:14,
Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> Hi,
>> I have been experimenting with the code from the replies to this post
so
>> far, but still can''t achieve what I want. If a file is
selected it is
>> uploaded just fine. However if no file is selected the application
spits out
>> the following error:
>> NoMethodError in UploadController#create
>>
>> undefined method `original_filename'' for nil:NilClass
>>
>> Rails.root: /home/resource_portal/website
>>
>> Application Trace | Framework Trace | Full Trace
>>
>>
rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
>> `method_missing''
>> app/models/upload.rb:13:in `save''
>> app/controllers/upload_controller.rb:13:in `create''
> You said that you have taken note of the previous replies, but looking
> at the code in upload_controller.rb you have not tested
> params[:upload] before calling Upload.save in the create action, which
> was the point of your original question I think. As I previously
> suggested you need to use something like
> if !params[:upload].blank?
> to prevent save being called when params[:upload] is nil or empty.
> What else you need to do in that action when it is empty I do not know
> as I do not know the details of what you want to achieve.
>
> Colin
>
>>
rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/implicit_render.rb:4:in
>> `send_action''
>>
rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in
>> `process_action''
>>
rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/rendering.rb:11:in
>> `process_action''
>>
>> ...
>>
>> I''m guessing I therefore need to be able to validate whether
there is
>> something in ''file_field'' before the post action
happens, but I''m not sure
>> how to do this. Any other suggestions would be great!
>>
>> Also Now I''m confused about the best place for this code to
go. I was
>> originally just putting one if statement in my controller, but as this
is
>> validation I guess it should go in the model.
>>
>> I should probably also point out that files are not being stored in a
>> database. Instead I am using GIT to version them and keep track of
their
>> history.
>> My current code is attached.
>>
>> Thanks,
>> Jen.
>>
>>
>> On 21/06/11 13:46, Chirag Singhal wrote:
>>
>> It would be better to delegate that job to Upload model.
>> Then you could write something like this:
>> #posts to the data model.
>> post = Upload.new(params[:upload])
>> if post.save
>> puts "file uploaded"
>> render ''upload''
>> repo.commit_all(params[:message])
>> else
>> redirect_to ''upload''
>> end
>> --
>> You received this message because you are subscribed to the Google
Groups
>> "Ruby on Rails: Talk" group.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msg/rubyonrails-talk/-/74m04USkgCsJ.
>> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>> To unsubscribe from this group, send email to
>>
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>>
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On 21 June 2011 22:11, Jen <jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> Hi Colin, > I did try implementing your suggestion in a previous experiment, which game > me the same result. > If I click the ''save upload'' button and have not > selected a file to upload the application falls over with the same error as > in my previous post. I need some way of checking whether file_field is > blank, and if it is prompting the user to select a file.It could not possibly give you exactly the same error on the same line of code, as the test would have prevented that line from being executed. It may have been a similar error on a different line of code. As I said before you can test for the field blank or nil using params[:upload].blank? Colin> > I am not sure where in the process of attempting to submit a file this check > needs to happen, though I assume it is before the post occurs. > > If this explanation is not clear enough please let me know and I will > attempt to explain it better. > > I am not sure if the fact that I am not using a database impacts on this. As > stated in my previous post the files are uploaded to a directory, then > committed to a git repo. > > Thanks in advance for any further help, > Jen. > > Note the code below does work, as long as a file is selected for upload. > Controller code: > def create > repo = Grit::Repo.new("/home/resource_portal/website/public/data/upload") > if !params[:upload].blank? > #posts to the data model. > post = Upload.save(params[:upload]), (params[:message]) > puts "file uploaded" > repo.commit_all(:message) > render ''upload'' > else > flash.now[:error] = "Please select a file to upload" > redirect_to ''upload'' > end > end > end > > On 21/06/11 20:26, Colin Law wrote: >> >> On 21 June 2011 19:14, Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: >>> >>> Hi, >>> I have been experimenting with the code from the replies to this post so >>> far, but still can''t achieve what I want. If a file is selected it is >>> uploaded just fine. However if no file is selected the application spits >>> out >>> the following error: >>> NoMethodError in UploadController#create >>> >>> undefined method `original_filename'' for nil:NilClass >>> >>> Rails.root: /home/resource_portal/website >>> >>> Application Trace | Framework Trace | Full Trace >>> >>> >>> rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in >>> `method_missing'' >>> app/models/upload.rb:13:in `save'' >>> app/controllers/upload_controller.rb:13:in `create'' >> >> You said that you have taken note of the previous replies, but looking >> at the code in upload_controller.rb you have not tested >> params[:upload] before calling Upload.save in the create action, which >> was the point of your original question I think. As I previously >> suggested you need to use something like >> if !params[:upload].blank? >> to prevent save being called when params[:upload] is nil or empty. >> What else you need to do in that action when it is empty I do not know >> as I do not know the details of what you want to achieve. >> >> Colin >> >>> >>> rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/implicit_render.rb:4:in >>> `send_action'' >>> >>> rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/abstract_controller/base.rb:151:in >>> `process_action'' >>> >>> rake-0.8.7/ruby/1.9.1/gems/actionpack-3.0.3/lib/action_controller/metal/rendering.rb:11:in >>> `process_action'' >>> >>> ... >>> >>> I''m guessing I therefore need to be able to validate whether there is >>> something in ''file_field'' before the post action happens, but I''m not >>> sure >>> how to do this. Any other suggestions would be great! >>> >>> Also Now I''m confused about the best place for this code to go. I was >>> originally just putting one if statement in my controller, but as this is >>> validation I guess it should go in the model. >>> >>> I should probably also point out that files are not being stored in a >>> database. Instead I am using GIT to version them and keep track of their >>> history. >>> My current code is attached. >>> >>> Thanks, >>> Jen. >>> >>> >>> On 21/06/11 13:46, Chirag Singhal wrote: >>> >>> It would be better to delegate that job to Upload model. >>> Then you could write something like this: >>> #posts to the data model. >>> post = Upload.new(params[:upload]) >>> if post.save >>> puts "file uploaded" >>> render ''upload'' >>> repo.commit_all(params[:message]) >>> else >>> redirect_to ''upload'' >>> end >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Ruby on Rails: Talk" group. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msg/rubyonrails-talk/-/74m04USkgCsJ. >>> To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org >>> To unsubscribe from this group, send email to >>> rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org >>> For more options, visit this group at >>> http://groups.google.com/group/rubyonrails-talk?hl=en. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Ruby on Rails: Talk" group. >>> To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org >>> To unsubscribe from this group, send email to >>> rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org >>> For more options, visit this group at >>> http://groups.google.com/group/rubyonrails-talk?hl=en. >>> > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > >-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
As Colin said, you shouldn''t be getting the exact same error at the exact same place. Would be good to check it out. Based on the code you posted, you are not using ActiveRecord features in Upload model, so do away with it and use ActiveModel instead. Here''s a great Railscast on this - http://railscasts.com/episodes/219-active-model I have modified the code a little bit to use ActiveModel instead of ActiveRecord. This should work fine. Here it is - https://gist.github.com/1039543 There are still some issue with the code with respect to following standards. You should rename the index action to be ''new'', because that''s what it is doing. Similarly, change the view file from upload.rhtml to new.html.erb Name of the controller should be plural, so it should be uploads controller. I am also assuming that you have a route in place in your routes.rb for upload, if not, it should have something like this: resource :upload -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/rSyybUgdcXwJ. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Thanks for the tip on active models! I don''t know much about the different types but I think this may be the answer to my problems. Though I have not been very exact with giving exact line nums etc for my errors I do understand if statements and what I am trying to do. Thanks to everyone else for help and suggestions so far. Hopefully I''ll solve it tomorrow! Thanks, Jen. On 22/06/11 06:14, Chirag Singhal wrote:> As Colin said, you shouldn''t be getting the exact same error at the > exact same place. Would be good to check it out. > > Based on the code you posted, you are not using ActiveRecord features > in Upload model, so do away with it and use ActiveModel instead. > Here''s a great Railscast on this > - http://railscasts.com/episodes/219-active-model > > I have modified the code a little bit to use ActiveModel instead of > ActiveRecord. This should work fine. > Here it is - https://gist.github.com/1039543 > > There are still some issue with the code with respect to following > standards. You should rename the index action to be ''new'', because > that''s what it is doing. Similarly, change the view file from > upload.rhtml to new.html.erb > Name of the controller should be plural, so it should be uploads > controller. > > I am also assuming that you have a route in place in your routes.rb > for upload, if not, it should have something like this: > resource :upload > -- > You received this message because you are subscribed to the Google > Groups "Ruby on Rails: Talk" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/rubyonrails-talk/-/rSyybUgdcXwJ. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en.-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.