Fields_for inserts 2 identical rows to the connecting table (has_many :through)

Rails
1

My models are TranslationKey, TranslationValue and KeyValue.

Here is the relevant part in the log: (the last two lines are
identical inserts!)

Processing TranslationKeysController#create (for 127.0.0.1 at
2010-05-04 22:13:31) [POST]
Parameters: {“commit”=>“Create”, “authenticity_token”=>“J+dt/
qHwHkbKygh0wBPnXPLtpkb3Pb8URxGucEbpLa0=”,
“translation_key”=>{“name”=>“key1”,
“translation_values_attributes”=>{“0”=>{“text”=>“value1”}}}}

INSERT INTO translation_keys (name, created_at, updated_at)
VALUES(‘key1’, ‘2010-05-04 22:13:31’, ‘2010-05-04 22:13:31’)
INSERT INTO translation_values (created_at, updated_at, text,
language_id) VALUES(‘2010-05-04 22:13:31’, ‘2010-05-04 22:13:31’,
‘value1’, NULL)
INSERT INTO key_values (translation_key_id,
translation_value_id, created_at, updated_at) VALUES(16, 27,
‘2010-05-04 22:13:31’, ‘2010-05-04 22:13:31’)
INSERT INTO key_values (translation_key_id,
translation_value_id, created_at, updated_at) VALUES(16, 27,
‘2010-05-04 22:13:31’, ‘2010-05-04 22:13:31’)

And here is the new template:

<% form_for(@key) do |f| %>
<% if f.error_messages.length > 0 %>


<%= error_messages_for :translation_key, :header_message =>
‘Error’, :message => ‘’ %>

<% end %>

<%= f.label :name, 'Key name' %>
<%= f.text_field :name %>

<% f.fields_for :translation_values do |value_fields| %> <%= value_fields.label :text, 'Content' %>
<%= value_fields.text_area :text %> <% end %>

<%= f.submit 'Create' %>

<% end %>
2

btw, my new action has this:

@key = TranslationKey.new
@key.translation_values.build