Rails 4 form - no implicit conversion of Model into String

Question

After adding a helper method and edit my form, I\'m getting this error

TypeError in Posts#create

Showing /Users/jim/project/test/app/views/posts/_form.html.erb          


        

Answer 1

I have found the problem thanks to @sissy comment.

I should pass @question = cookies[:question] instead of @question = Question.where(id: params[:post][:question_id]).first in my create action of my posts controller

Thanks everyone for your help.

Answer 2

Your helper seems suspicious to me -- you're passing a Ruby object and trying to parse it as JSON

I think the @sissy comment is spot on - I think it's an issue with your passing the object at different stages. And considering you're getting the error when you receive errors on Post.save, sissy will likely be correct

Further, I'd imagine the fundamental problem would be this:

@question ->

     !ruby/object:Question
      attributes:
         -- title: x
         -- created_at: y
         -- updated_at: z

If you're parsing JSON, surely this would try to translate !ruby/object:Question into an array element, meaning it needs to be a String in order for it to work

---

Fix

I would fix it by changing the helper to this:

#app/helpers/questions_helper.rb
def show_random(post)
   returned_post = Post.random_question(post)
   returned_post.title
end

#app/models/post.rb
Class Post < ActiveRecord::Base
    def self.random_question(post)
        joins(:question).where(#your conditions here)
    end
end

You could then use:

<%= show_random(@post) %>