*I Copied this from StackOverflow since I did not get any response there.
There is an update at the end. *
I am not sure why my checkboxes for a has_many through are not saving. This
is a rather complex form (An online application for a language summer
program) so in addition to regular applicant information, I am collecting
attributes of a LanguageBackgroundAndInterest model using a fields_for.
Part of these attributes are the books that the applicant used to learn the
language. The code looks like this:
<%= f.fields_for :language_background_and_interest do |builder| %>
<div class="field">
<%= hidden_field_tag "language_background_and_interest[book_ids][]" %>
<% Book.all.each do |book| %>
<br><%= check_box_tag "language_background_and_interest[book_ids][]",
book.id %>
<%= book.name.humanize %>
<% end %>
</div>
<% end %>
Both the language_background_and_interest and books are joined together
using a has_many_through like so:
class LanguageBackgroundAndInterest < ActiveRecord::Base
attr_accessible :book_ids
has_many :language_background_books
has_many :books, through: :language_background_booksend
class Book < ActiveRecord::Base
attr_accessible :name, :publisher
has_many :language_background_books
has_many :language_background_and_interests, through:
:language_background_booksend
# Join Tableclass LanguageBackgroundBook < ActiveRecord::Base
attr_accessible :language_background_and_interest_id, :book_id
belongs_to :language_background_and_interest
belongs_to :bookend
I am not sure why the books from the checkboxes don't get assigned to the
appropriate background model. Any ideas?
PS: Granted, this design is rather ambiguous (Why not make books belong to
an applicant?), but I currently want to put up a prototype and I am also
constrained by a dubious requirement. So I need this working.
Update:
I appended the word "attributes" bellow to the language_background model in
the hope that the books_ids array gets inserted properly into the params
hash with the other attributes. Inspecting the development.log, I can see
the key language_background_and_interest_attributes twice: One for all the
other data which get successfully saved, and one for the book_ids array
which apparently gets ignored. Any ideas?
<%= f.fields_for :language_background_and_interest do |builder| %>
<div class="field">
<%= hidden_field_tag
"language_background_and_interest_attributes[book_ids][]" %>
<% Book.all.each do |book| %>
<br><%= check_box_tag
"language_background_and_interest_attributes[book_ids][]", book.id %>
<%= book.name.humanize %>
<% end %>
</div>
<% end %>
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