Rails Controller include record and it's children -

in rails app, create list view includes master record , it's children.

workorder model:

  belongs_to :parent, :class_name => "workorder", :foreign_key => "parent_id"   has_many :children, :class_name => "workorder", :foreign_key => "parent_id" 

this attempt:

  def index17     @workorder = params[:workorder_id]     @workorders =  workorder.find(@workorder)     @workorders = @workorders + workorder.find(@workorder).children       end 

i'm trying make master first record , of it's children.

rails doesn't "+":

undefined method `+' #<workorder:0x007fefcddf85f8> 

thanks help!

something should work:

def index17   @workorder_id = params[:workorder_id]   @workorder =  workorder.find(@workorder_id)   @workorders = [@workorder, @workorder.children].flatten end 

this create flat list, parent first, followed children.

alternatively, if you'd try rails / sql magic, can order parent_id column, so:

@workorders = workorder.where("parent_id = ? or (parent_id null , id = ?)", params[:workorder_id], params[:workorder_id]).order(:parent_id) 

consequently, parent on top (because null column ordered first, followed each of children. advantage version has is 1 less query on database, , @ least 1 less line of code; both of nice.