Thank you for your code. I couldn't have done it without you. I understand how to add some reference for same table.
2012/6/18 Patrick Mulder <[email protected]> > On Mon, Jun 18, 2012 at 7:38 AM, tanizawa <[email protected]> wrote: > > hi > > > > I am tanizawa > > I am searching how to add reference of two same table. > > Please teach me how to add . > > exmple: > > class CreateLocationjs < ActiveRecord::Migration > > def change > > create_table :locationjs do |t| > > t.references :locationm <----start point > > <--- I want to add end point > > field. > > > > Not sure what your exact question is, but this example below > references a location 2 times: > > # Create models: > rails g model location name:string > rails g model route > > # Add associations between models: > in Location, add: > has_many :routes > > in Route, add: > belongs_to :location_start, :class_name => Location, :foreign_key > => "location_start_id" > belongs_to :location_end, :class_name => Location, :foreign_key > => "location_end_id" > > # Define foreign keys in db migration: > > class CreateRoutes < ActiveRecord::Migration > def change > create_table :routes do |t| > t.references :location_start > t.references :location_end > > t.timestamps > end > end > end > > # Now in console: > munich = Location.new > munich.name = "Munich"; munich.save! > > tokyo = Location.new > tokyo.name = "Tokyo"; tokyo.save! > > route = Route.new > route.location_start = munich > route.location_end = tokyo > route.save! > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
