Although the code seems to be right, when I try to send the form, the values of the multiple select aren't being sent.If I just remove the multiple option, everything works as expected considering just one value, but it's important to store more than one tag per transaction.
Do you have any ideas about what could be happening here?
Model
Transaction.rb
class Transaction < ActiveRecord::Base has_and_belongs_to_many :tags Tag.rb
class tag < ActiveRecord::Base has_and_belongs_to_many :transactions
View
<%= form.collection_select :tag_ids, @tags, :id, :name, {}, {:multiple => true} %>
Result:
<select id="transaction_tag_ids" multiple="multiple" name="transaction[tag_ids][]"> <option value="1">..</option> </select>
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