Question

我刚刚创建了一个创建功能，用于添加团队并将成员添加到所述团队。

表格包含以下内容：

团队名称。
团队的部门。
Leader（值是用户ID，但显示为全名）
成员（值是用户ID，但也显示为全名）//我使用了一个名为select2的特殊选择菜单。

以下是模型。我只会展示与我的问题相关的关联和一些方法。

user.rb

class User < ActiveRecord::Base
    has_many :memberships
    has_many :teams, through: :memberships

    accepts_nested_attributes_for :memberships, :teams
end

team.rb

class Team < ActiveRecord::Base
    has_many :memberships
    has_many :teams, through: :memberships

    accepts_nested_attributes_for :memberships, :users

    def build_membership(user_ids)
        unless user_ids.blank?
            user_ids.each do |id|   
                self.users << User.find_by_id(id)
            end
        end
    end

end

membership.rb

class Membership < ActiveRecord::Base
    belongs_to :team
    belongs_to :user

    #Note that leader and members are both users
end

这是控制器，带有创建和更新方法。

class TeamsController < ApplicationController
    def create
        @team = Team.new(team_params)
        @team.build_membership(build_members_array(members_params))

        if @team.save
            flash.now[:success] = 'Team was successfully created.'
            redirect_to @team
        else
            flash.now[:notice] = @team.errors.full_messages
            render "new"
        end
    end

    def update
        # TO-DO: update leader and members (i.e. add or remove member)
        if @team.update(team_params)
            flash.now[:success] = "Team was successfully updated."
            redirect_to @team
        else
            flash.now[:notice] = @team.errors.full_messages
            render "edit"
        end
    end

    private
        def team_params
            params.require(:team).permit(:name,:department)
        end

        def members_params
            params.require(:team).permit(:leader, members:[])
        end

        def build_user_ids_array(members)
            #put ids of leader and members in an array
        end
end

似乎只有名称和部门属性才会更新，而领导者和成员则不会。我是否应该再次创建自己的方法来更新团队名单或做其他事情？

Answer 1

@team.build_membership如果您传递参数来创建新用户，但您使用的是现有的User，那么这将不适用。您需要改为通过User获取所有id，然后添加Team。您还需要在id方法的members_attributes中允许member_params。类似的东西：

def create
    @team = Team.new(team_params)
    @team.memberships << users_from_params

    if @team.save
        flash.now[:success] = 'Team was successfully created.'
        redirect_to @team
    else
        flash.now[:notice] = @team.errors.full_messages
        render "new"
    end
end

def members_params
   params.require(:team).permit(:leader, members_attributes: [:id])
end

def users_from_params
  #This members_params[:members_attributes].values should be an array of `id`s
  User.find(members_params[:members_attributes].values)
end

更新rails中的多对多关联（用户 - 团队关系又称成员身份）

1 个答案: