问题
I am working on a dynamically nested form using the cocoon gem. I have two models
class CrossTable < ActiveRecord::Base
attr_accessible :title, :table_name, :database, :folder_label_id, :foreign_fields_attributes
belongs_to :folder_label
has_many :foreign_fields
accepts_nested_attributes_for :foreign_fields
validates :title, :table_name, :database, :folder_label_id, presence: true
end
class ForeignField < ActiveRecord::Base
attr_accessible :cross_table_id, :column_name, :description
belongs_to :cross_table
has_many :filter_sets
end
I have cocoon and jquery-rails in the gemfile I added //=require cocoon to the application.js file
And here is my form partial
<%= simple_form_for @table do |f| %>
<%= f.input :title %>
<%= f.input :folder_label_id, :collection => @folders, :label_method => :title, :value_method => :id %>
<br><br>
<%= f.input :table_name %>
<%= f.input :database %>
<%= f.simple_fields_for :foreign_fields do |fields| %>
<%= render 'foreign_field_fields', :f => fields %>
<div id='links'>
<%= link_to_add_association 'Add Field', f, :foreign_fields %>
</div>
<% end %>
<%= f.button :submit %>
<% end %>
@table is an instance of the cross table model. Nothing in the foreign_field_fields partial shows up and link_to_add_association does nothing, and I get no errors. How can I start debugging this? Does anyone spot an error?
回答1:
You wrote the link_to_add_association
inside the simple_fields_for
, which will loop over all :foreign_fields
and execute the given block. So if there are no foreign-fields yet, the link_to_add_association
is never shown.
You should write your view as follows (as documented):
<%= simple_form_for @table do |f| %>
<%= f.input :title %>
<%= f.input :folder_label_id, :collection => @folders, :label_method => :title, :value_method => :id %>
<br><br>
<%= f.input :table_name %>
<%= f.input :database %>
<%= f.simple_fields_for :foreign_fields do |fields| %>
<%= render 'foreign_field_fields', :f => fields %>
<% end %>
<div id='links'>
<%= link_to_add_association 'Add Field', f, :foreign_fields %>
</div>
<%= f.button :submit %>
<% end %>
Hope this helps.
来源:https://stackoverflow.com/questions/11813161/no-errors-and-no-output-for-rails-cocoon-gem