Error

gistfile1.txt

Controller Update
def update
  	@channel = Channel.find(params[:id])
        @channel.attributes = params[:channel]
		if @channel.save! #@channel.update_attributes(params[:channel])
			redirect_to @channel, notice: 'Channel was successfully updated.'
		else
			render action: 'edit'
		end
	end

Error Log

Processing by ChannelsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"LneNpGZw5NG4cr71ZYY0yWj/3w70BJhPpBpwV502i2k=", "channel"=>{"channel_name"=>"National Agentsas", "internal_flag"=>"Y", "multiple_inventory_clusters"=>"Y", "multiple_inventory_trans_types"=>"Y", "channel_mappings_attributes"=>{"0"=>{"src_channel"=>"INDIRECT_AGENT", "channel_name"=>"National Agents", "src_file_type"=>"INVENTORY", "id"=>"INDIRECT_AGENT"}, "1"=>{"src_channel"=>"Charlie", "channel_name"=>"National Agents", "src_file_type"=>"BID", "id"=>"Charlie"}}}, "commit"=>"Update Channel", "id"=>"2"}
  Channel Load (2.0ms)  SELECT "channels".* FROM "channels" WHERE "channels"."id" = 2 LIMIT 1
  ChannelMapping Load (0.0ms)  SELECT "channel_mappings".* FROM "channel_mappings" WHERE "channel_mappings"."channel_name" = 'National Agentsas' AND "channel_mappings"."src_channel" IN ('INDIRECT_AGENT', 'Charlie')
      An error occurred while [App Name] Exception - channels-update:
      Type: ActiveRecord::RecordNotFound
      Message:  Couldn't find ChannelMapping with ID=INDIRECT_AGENT for Channel with ID=2
      Backtrace:
/Users/ankitgupta/.rvm/gems/jruby-1.7.3/gems/activerecord-3.2.13/lib/active_record/nested_attributes.rb:463:in `raise_nested_attributes_record_not_found'
/Users/ankitgupta/.rvm/gems/jruby-1.7.3/gems/activerecord-3.2.13/lib/active_record/nested_attributes.rb:428:in `assign_nested_attributes_for_collection_association'
org/jruby/RubyArray.java:1613:in `each'
/Users/ankitgupta/.rvm/gems/jruby-1.7.3/gems/activerecord-3.2.13/lib/active_record/nested_attributes.rb:401:in `assign_nested_attributes_for_collection_association'
/Users/ankitgupta/.rvm/gems/jruby-1.7.3/gems/activerecord-3.2.13/lib/active_record/nested_attributes.rb:295:in `channel_mappings_attributes='