Ruby on Rails的協會與模型許多一對多

Question

與回報率我真的初學者，並試圖處理我的多對多協會

我處理我的模型之間遷移

旅行模式

的關係

class Trip < ActiveRecord::Base 
has_many :relationships 
has_many :topics, through: :relationships 
end 

用戶模型

class User < ActiveRecord::Base 
has_many :relationships 
has_many :trips, through: :relationships 
end 

關係模型

class Relationship < ActiveRecord::Base 
belongs_to :user 
belongs_to :trip 
end 

我的移民

class CreateRelationships < ActiveRecord::Migration 
def change 
create_table :relationships do |t| 
    t.belongs_to :user 
    t.belongs_to :trip 
    t.timestamps 
end 
add_index :relationships, :user_id 
add_index :relationships, :trip_id 
end 
end 

User_controller

class UsersController < ApplicationController 


before_action :set_user, only: [:show, :edit, :update, :destroy] 



def trips 
@user = User.find(params[:id]) 
@trips = @user.trips 

end 
def index 
@users = User.all 
end 

    def show 
@user = User.find(params[:id]) 
end 
def new 
@user = User.new 
@trips = Trip.all 
end 
def edit 
end 
def create 
@user = User.new(user_params) 

respond_to do |format| 
    if @user.save 
    format.html { redirect_to @user, notice: 'User was successfully created.' } 
    format.json { render :show, status: :created, location: @user } 
    else 
    format.html { render :new } 
    format.json { render json: @user.errors, status: :unprocessable_entity } 
    end 
end 
end 



def update 
respond_to do |format| 
    if @user.update(user_params) 
    format.html { redirect_to @user, notice: 'User was successfully updated.' } 
    format.json { render :show, status: :ok, location: @user } 
    else 
    format.html { render :edit } 
    format.json { render json: @user.errors, status: :unprocessable_entity } 
    end 
end 
end 


def destroy 
@user.destroy 
respond_to do |format| 
    format.html { redirect_to users_url, notice: 'User was successfully destroyed.' } 
    format.json { head :no_content } 
end 
end 

private 

def set_user 
    @user = User.find(params[:id]) 
end 


def user_params 
    params.require(:user).permit(:name) 
end 
end 

我不`噸知道如何旅行分配給用戶，並在那裏寫在控制器或形式分配？

@ user.trips < < @trip不起作用

Answer 1

的模式爲改變： -

旅行模式

class Trip < ActiveRecord::Base 
has_many :relationships 
has_many :users, through: :relationships 
end 

用戶模型

class User < ActiveRecord::Base 
has_many :relationships 
has_many :trips, through: :relationships 
end 

然後試試這樣： -

@user.trips << @trip