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PORails checkboxes for nested attributes return an array, not hash -- getting HashWIthIndifferentAccessError
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  1. PORails checkboxes for nested attributes return an array, not hash -- getting HashWIthIndifferentAccessError
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    copied!<p>I have Committee and Meeting objects. When creating a Meeting, I want to associate a Committee or Committees at the same time. CommitteeMeeting is a nested attribute of Meeting.</p> <p>Following the solution <a href="https://stackoverflow.com/questions/727300/nested-object-w-checkboxes-mass-assignment-even-with-accepts-nested-attribute?rq=1">here</a> almost exactly, I get the following parameters:</p> <pre><code>--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess utf8: ✓ authenticity_token: us1hzugov7DDIpKNobOZJbuk14KsIsoz3uJRZEy2VRc= meeting: !ruby/hash:ActiveSupport::HashWithIndifferentAccess date: '2001-01-03' room_id: '1' committee_meetings_attributes: !ruby/hash:ActiveSupport::HashWithIndifferentAccess '0': !ruby/hash:ActiveSupport::HashWithIndifferentAccess committee_id: '1' '1': !ruby/hash:ActiveSupport::HashWithIndifferentAccess committee_id: '2' commit: Create meeting action: create controller: meetings </code></pre> <p>The committee_meeting_attributes are properly nested, but in an array, which seems to be what is causing the error. Rails is expecting a hash. The solution I'm using as a reference gets a hash in the parameters.</p> <pre><code> {"user"=&gt;{"password_confirmation"=&gt;"[FILTERED]", "roles_attributes"=&gt;{"id"=&gt;"2"}, ... </code></pre> <p>In <a href="https://stackoverflow.com/questions/3765810/why-is-accepts-nested-attributes-for-not-working-for-me-rails-3">this question</a>, the developer got a similar error in his parameters, but his problem was not having the nested attributes accessible in the parent model. I do have the nested attributes accessible in the model.</p> <p>Here is the view:</p> <pre><code>&lt;% provide(:title, 'Create site') %&gt; &lt;h1&gt;Create meeting&lt;/h1&gt; &lt;div class="row"&gt; &lt;div class="span6 offset3"&gt; &lt;%= form_for(@meeting) do |f| %&gt; &lt;%= render :partial =&gt; 'shared/error_messages', :locals =&gt; {:object =&gt; @meeting} %&gt; &lt;%= f.label :date %&gt; &lt;%= f.text_field :date %&gt; &lt;% @rooms.each do |room| %&gt; &lt;%= f.radio_button :room_id, room.id %&gt; &lt;%= room.name %&gt;&lt;br /&gt; &lt;% end %&gt; &lt;%= f.fields_for :committee_meetings do |builder| %&gt; &lt;% committee = Committee.find(builder.object.committee_id) %&gt; &lt;li&gt;&lt;%= builder.check_box :committee_id, { :checked =&gt; false }, builder.object.committee_id %&gt; &lt;%= builder.label :committee_id, "#{committee.name}" %&gt; &lt;/li&gt; &lt;% end %&gt; &lt;%= f.submit "Create meeting", class: "btn btn-large btn-primary" %&gt; &lt;% end %&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>Here is the Meetings controller:</p> <pre><code>class MeetingsController &lt; ApplicationController def create @rooms = Room.all @committees = Committee.all @meeting = Meeting.new(params[:meeting]) @meeting.creator_id = current_user.id @meeting.updater_id = current_user.id if @meeting.save flash[:success] = "You have succesfully created a meeting on #{@meeting.date} in #{@meeting.room.site.name}, #{@meeting.room.name}!" redirect_to root_url else render 'new' end end def new @rooms = Room.all @meeting = Meeting.new @committees = Committee.all end </code></pre> <p>Here is the model:</p> <pre><code>class Meeting &lt; ActiveRecord::Base attr_accessible :creator_id, :date, :room_id, :updater_id, :committee_meetings_attributes has_many :committee_meetings accepts_nested_attributes_for :committee_meetings, :allow_destroy =&gt; true has_many :committees, through: :committee_meetings belongs_to :room belongs_to :creator, :class_name =&gt; 'User' belongs_to :updater, :class_name =&gt; 'User' end </code></pre>
 

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