如何在组和用户之间创建加入操作? [英] How do I create a join action between a group and a user?

问题描述

  has_many :memberships, :dependent => :destroy
  has_many :groups, :through => :memberships

会员资格.rb

class Membership < ActiveRecord::Base
  attr_accessible :user_id, :group_id
  belongs_to :user
  belongs_to :group
  validates_uniqueness_of :user_id, :message => "You can only join one group!"

end

group.rb

has_many :memberships, :dependent => :destroy
has_many :users, :through => :memberships

groups_controller.rb

def join
    @group = Group.find(params[:id])
    @m = @group.memberships.build(:user_id => current_user.id)
    respond_to do |format|
      if @m.save
        format.html { redirect_to(@group, :notice => 'You have joined this group.') }
        format.xml  { head :ok }
      else
        format.html { redirect_to(@group, :notice => 'Join error.') }
        format.xml  { render :xml => @group.errors, :status => :unprocessable_entity }
      end
    end
  end

memberships_controller.rb

class MembershipsController < ApplicationController
before_filter :authenticate_user!
  def create
    @membership = current_user.memberships.build(:group_id => params[:group_id])
    if @membership.save
      flash[:notice] = "You have joined this group."
      redirect_to :back
    else
      flash[:error] = "Unable to join."
      redirect_to :back
    end
  end

  def destroy
    @membership = current_user.memberships.find(params[:id])
    @membership.destroy
    flash[:notice] = "Removed membership."
        redirect_to :back
  end
end

用户通过成员资格模型拥有组，该模型是一个连接表.我的问题.如何创建供用户单击的加入操作，以便他们可以加入组?

Users have groups through a membership model which is a join table. My question. How do I create a join action for users to click on so that they can join a group?

推荐答案

您已经完成了第 1 步，即添加控制器操作.现在您只需要添加适当的路由并将其连接到您的视图中.

You've already completed step 1, which is adding the controller actions. Now you just need to add the appropriate route and wire it up in your views.

在你的 routes.rb 中:

resources :groups do
    get 'join', :on => :member
end

在您的视图文件中:

<%= link_to "加入这个组", join_group_path(@group) %>

就是这样！

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