Undefined method `model_name' for NilClass:Class in a form_for

Rails
1

Hi! I know that there are other topics about this issue, I read them and
I’m always blocked. Here is the error message:

undefined method `model_name’ for NilClass:Class

Extracted source (around line #30):

27:
28:

Add Translation


29:
30: <%= form_for @new_trad do |f| %>
31: Locale: <%= f.text_field :locale %>
32: Key : <%= f.text_field :key %>
33: Value : <%= f.text_field :value %>

The new method in TranslationsController:

def new
@new_trad = Translations.new
end

Tell me if other informations are needed.
Thanks in advance!

ps: Sorry for my bad english :slight_smile:

2

Michael P. wrote in post #1001495:

Just a guess, but you might want:
@new_trad = Translation.new

No, it’s Translations and I forgot to tell that it’s not an ActiveRecord
model.

3

On 27 May 2011 13:21, Louis W. [email protected] wrote:

undefined method `model_name’ for NilClass:Class

30: <%= form_for @new_trad do |f| %>

This means that the @new_trad object is probably nil.

def new
@new_trad = Translations.new
end

Just a guess, but you might want:
@new_trad = Translation.new

If that’s not it, I’d recommend checking out the guides on debugging
and put a breakpoint in the view.

4

On 27 May 2011 14:23, Louis W. [email protected] wrote:

Michael P. wrote in post #1001495:

Just a guess, but you might want:
@new_trad = Translation.new

No, it’s Translations and I forgot to tell that it’s not an ActiveRecord
model.

Right… so the form_for stuff won’t work then, unless you add all the
methods it needs that a “normal” model would inherit from AR::Base (or
probably won’t work at all - use a form_tag instead…)

5

Michael P. wrote in post #1001516:

Right… so the form_for stuff won’t work then, unless you add all the
methods it needs that a “normal” model would inherit from AR::Base (or
probably won’t work at all - use a form_tag instead…)

Thanks you, i tried with form_tag and it works.