Ruby on Rails的协会与模型许多一对多

Question

与回报率我真的初学者，并试图处理我的多对多协会

我处理我的模型之间迁移

旅行模式

的关系

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

用户模型

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

关系模型

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`吨知道如何旅行分配给用户，并在那里写在控制器或形式分配？

@ user.trips < < @trip不起作用

Answer 1

的模式为改变： -

旅行模式

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

用户模型

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

然后试试这样： -

@user.trips << @trip