谁属于谁-嵌套模型-Rails

Question

Suppose I have a user table and a campaign table (with a user_id column) and that each campaign has one creator (who is a user), and a list of members, who are also (users). So I have

class UsersController < ApplicationController
  has_many :campaigns

and

class CampaignsController < ApplicationController

  belongs_to :user 
  has_many :users 
  accept_nested_attributes_for :users

but I get an error : ActionController::RoutingError (undefined method belongs_to' for CampaignsController:Class)`

Answer 1

the model relationship must be declared in your model file, not in your controller . it should be :

class User < ActiveRecord::Base
  has_many :campaigns


class Campaign< ActiveRecord::Base

  belongs_to :user 
  has_many :users 
  accept_nested_attributes_for :users

Answer 2

Methods #has_many and #belongs_to are defined for ActiveRecord models, not ActionPack controller.

You need to create models (with migrations creating tables and columns): User and Camaign and define relationships there, and in controllers you just fetch models and show them on view, or update models with params from user.