Model form within another model's form in Ruby on Rails -

Model form within another model's form in Ruby on Rails -

i have content model, playlist model , bring together association in model called playlistitem.

this how they're connected:

class content < activerecord::base has_many :playlist_items has_many :playlists, through: :playlist_items end class playlist < activerecord::base has_many :playlist_items, -> { order 'position asc' } has_many :contents, through: :playlist_items end class playlistitem < activerecord::base belongs_to :content belongs_to :playlist end

when edit playlist, form shows field name, that's attribute has. want able add together content playlist (in position, that's playlistitems attribute) within form.

how can that?

this code have now:

<%= form_for(@playlist) |f| %> <div class="field"> <%= f.label :name %><br> <%= f.text_field :name %> </div> <%= f.fields_for :playlist_items |builder| %> <fieldset> <%= builder.label :content, "content id" %><br> <%= builder.text_area :content_id %> </fieldset> <% end %> <div class="actions"> <%= f.submit %> </div> <% end %>

first, can allow playlist model take nested attributes playlist_items.

class playlist < activerecord::base has_many :playlist_items, -> { order 'position asc' } has_many :contents, through: :playlist_items accepts_nested_attributes_for :playlist_items end

then, can add together content_id collection select, create drop downwards selection of contents each playlist item.

<%= f.fields_for :playlist_items |builder| %> <%= builder.label :position %><br> <%= builder.integer :position %><br> <%= builder.label :content %><br> <%= builder.collection_select :content_id, @contents, :id, :title, include_blank: 'please select' %> <% end %>

finally, in controller, you'll need allow playlist items attributes passed params, , set @contents instance variable.

class playlistcontroller < applicationcontroller before_action :load_contents, only: [:new, :edit] def edit @playlist = playlist.find(params[:id]) # build 10 playlist_items added playlist 10.times do; @playlist.playlist_items.build; end end private def load_contents @contents = content.all # or query specific contents you'd end def playlist_params params.require(:playlist).permit(:name, playlist_items_attributes: [:id, :position, :content_id]) end end

remember you'll need build each playlist item you'd use. can in new , edit methods desire.

ruby-on-rails ruby forms model associations