[Rails 3.0.9] I have trouble about fields_for

rubyonrails-talk
1

Hi,all. I'm new bee to Rails and I have trouble about fields_for method.. It isn't show up between the <%= f.fields ~ <% end %>

Please teach me some advice. Thanks!

#new/_form.html.erb <%= form_for(@user) do |f| %>

  <div class="field">     <%= f.label :name %><br />     <%= f.text_field :name %>   </div>

<!-- Below the code doesn't show up.(<%= f.fields ... <% end %>) -->

    <%= f.fields_for :entry do |entry_form| %>

      Title:<br/>     <%= entry_form.text_field :title %>

    <% end %>     <br/>     <%= f.submit "Create" %> <% end %>

# user.rb

class Entry < ActiveRecord::Base   belongs_to :user end

# entry.rb

class User < ActiveRecord::Base   has_many :entries   accepts_nested_attributes_for :entries

end

2

You can't refer entries as entry in your form. I think you want a has_one relationship between user and entry.

3

<%= f.fields_for :entries do |entry_form| %>

4

if user has_many entries then in the form you can do fields_for :entries

5

Thanks Maruo,Sammer! I edit the entry to entries. And I add new Action to

@post.tags build

then it worked fine!

But I don’t know @post.tags.build mean. Please teach me about this mean?

#post_controller.rb

def new

@post = Post.new

@post.tags.build

tags is table name.

table name : tags

table columns *tag_name

tnanks!