Strange thing in Rails views

Hello people,

I am developing an app with Rails 4.0.x and I have a strange bug in its
view. Say I have a partial like this

%p= @bject,name # would work perfectly

= render @object.friends # It won’t fetch this relation

%p= @object,name # It would say can’t find name for nil class

For some reason the above stuff happens. However in the rails console,
all
would work fine. Kinda confused.

Would be great if any one could throw light on this. Don’ know if this
is a
Rails bug where state of instance variable gets forgotten after some
time.

On 1 April 2014 06:11, Karthikeyan A K [email protected] wrote:

Hello people,

I am developing an app with Rails 4.0.x and I have a strange bug in its
view. Say I have a partial like this

%p= @bject,name # would work perfectly

Does using @object,name also work (not @bject which you have written
above)?

= render @object.friends # It won’t fetch this relation

What do you mean it will not fetch the relation? What is the error
message?

%p= @object,name # It would say can’t find name for nil class

Then @object is nil. Perhaps you should be using @bject.

Note that when posting code it is better to copy/paste then there will
be no confusion about what the code actually is.

For some reason the above stuff happens. However in the rails console, all
would work fine. Kinda confused.

Would be great if any one could throw light on this. Don’ know if this is a
Rails bug where state of instance variable gets forgotten after some time.

My experience is that bugs in compilers/frameworks/OSs are very rarely
the cause of problems. 99.999% it is one’s own code that is at fault.

Colin

On Tue, Apr 1, 2014 at 2:04 PM, Colin L. [email protected] wrote:

Actually the variable name is not @Object. Its some thing else. Have
checked spelling, copied and pasted it. But nope. It won’t work.

= render @object.friends # It won’t fetch this relation

What do you mean it will not fetch the relation? What is the error
message?

There shows no error, it just returns nil object. If I give @
obj.friends.first.name , it would say undefined method first for nil
object!

%p= @object,name # It would say can’t find name for nil class

Then @object is nil. Perhaps you should be using @bject.

Note that when posting code it is better to copy/paste then there will
be no confusion about what the code actually is.

Yup copied, pasted and banged my head on desk a 1000 times.

Say if in the action if I keep @object2 = Person.find params[:id] and if
I
use @object2 in code, it works perfectly everywhere. This bug is
repeatable
on server and my local system running ruby 2.1.0 and Rails 4.3.

Some how rails is forgetting what @object is in the middle of view.

For some reason the above stuff happens. However in the rails console, all
would work fine. Kinda confused.

Would be great if any one could throw light on this. Don’ know if this is
a
Rails bug where state of instance variable gets forgotten after some time.

My experience is that bugs in compilers/frameworks/OSs are very rarely

On 1 April 2014 11:50, Karthikeyan A K [email protected] wrote:

%p= @bject,name # would work perfectly
= render @object.friends # It won’t fetch this relation

%p= @object,name # It would say can’t find name for nil class

Then @object is nil. Perhaps you should be using @bject.

Note that when posting code it is better to copy/paste then there will
be no confusion about what the code actually is.

Yup copied, pasted and banged my head on desk a 1000 times.

I meant that you should copy/paste the code here rather than typing
something similar for us to look at.

Say if in the action if I keep @object2 = Person.find params[:id] and if I
use @object2 in code, it works perfectly everywhere. This bug is repeatable
on server and my local system running ruby 2.1.0 and Rails 4.3.

Some how rails is forgetting what @object is in the middle of view.

I don’t think it is at all likely that it is forgetting it, but if you
don’t show us the actual failing code then it is difficult to help.
You could try inserting puts statements in the code (which will appear
in the server log) between the point at which it knows the variable
and the point at which you think it has forgotten, in order to see
which bit of code is causing it to be ‘forgotten’.

As I said it is most likely something in your code that is causing the
problem, but if you do not show us the actual code (just the failing
area) then it is difficult to help.

Colin

On Tuesday, 1 April 2014 06:50:20 UTC-4, Karthikeyan A K wrote:

view. Say I have a partial like this

Yup copied, pasted and banged my head on desk a 1000 times.

Say if in the action if I keep @object2 = Person.find params[:id] and if I
use @object2 in code, it works perfectly everywhere. This bug is repeatable
on server and my local system running ruby 2.1.0 and Rails 4.3.

Some how rails is forgetting what @object is in the middle of view.

I’m going to assume the “3” in “4.3” is a typo - otherwise, say hi to
the
future people for me. :slight_smile:

Anyways, the usual cause of weird name-specific behavior is that you’ve
picked a name which is used internally by part of Rails. Sanitizing your
example to “@object” rather than the real name is going to make this
difficult to troubleshoot…

–Matt J.

Ya possibly. Any way did a work around. Thanks a lot for your replies.

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs