Error during the creation of hidden fields for nested objects

Question

I am using rails 2.3.5. I have a Blog model and Blog has many comments. This is my Blog controller show action

def show
  @blog = Blog.find(params[:id])
  @comment = Comment.new
end

I would display the Blog and at the end would have an option for creating comment. So I add this in blogs/show.html.erb.

<% form_remote_for  @comment do |f| %>
      <%= f.label :content %>
      <%= f.text_area :content, :rows => 6 %>
      <%= f.hidden_field :blog => @blog %>
      <%= f.submit %>
  <% end %>

But i get the following error when i run this NoMethodError in Blogs#show

Showing app/views/blogs/show.html.erb where line #270 raised:

undefined method `blog#<Blog:0xb677d8d0>' for #<Comment:0xb67762b0>

Extracted source (around line #270):

Arun Kumar Arjunan · Accepted Answer · 2011-08-23 09:00:47Z

2

Comment model should have belongs_to :blog

Blog model should have has_many :comments

Initialize the comment in the controller like this:

@blog.comments.new

The view should be like this:

<%= f.hidden_field :blog_id %>

answered Aug 23, 2011 at 9:00

Arun Kumar Arjunan

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1 Comment

Dnyan Waychal Over a year ago

to '@comment' only with '@comment = @blog.comments.build'

Dnyan Waychal · Accepted Answer · 2011-08-23 09:03:05Z

1

you have to hide the id of the blog not the blog object.

<%= f.hidden_field :blog_id%>

answered Aug 23, 2011 at 9:03

Dnyan Waychal

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Comments

Chowlett · Accepted Answer · 2011-08-23 09:09:17Z

0

The problem is your f.hidden_field line. The first parameter should be the attribute name of the @comment you want in the field, but in your code it's a Hash.

I'd suggest adjusting your show action to set @comment = @blog.comments.build, and change the view to read f.hidden_field :blog_id.

answered Aug 23, 2011 at 9:09

Chowlett

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