我有以下模型:团队,成员,作业,角色
团队模型has_many成员。每个成员通过作业都有很多角色。角色分配是Captain和Runner。我还使用Member模型安装了devise和CanCan。
我需要做的是限制每支队伍最多有1名队长和5名参赛者。
我发现了这个example,它似乎在一些自定义后工作,但在更新时('teams / 1 / members / 4 / edit')。它不适用于create('teams / 1 / members / new')。但我的其他验证(验证:role_ids,:presence => true )确实适用于更新和创建。任何帮助将不胜感激。
更新:我发现此example似乎与我的问题类似,但我似乎无法使其适用于我的应用。
似乎问题的根源在于在验证之前和验证期间如何执行计数(或大小)。
例如:
更新记录时... 它会检查团队中有多少参赛者并返回计数。 (即5)然后,当我选择要添加到成员的角色时,它从数据库中获取已知计数(即5)并添加建议的更改(即1),然后运行验证检查。 (Team.find(self.team_id).members.runner.count> 5)这样可以正常工作,因为它返回值6和6> 5因此建议的更新失败而不保存并给出错误。
但是当我尝试在团队中创建新成员时... 它会检查团队中有多少参赛者并返回计数。 (即5)然后,当我选择要添加到成员的角色时,它从数据库中获取已知计数(即5),然后运行验证检查不用分解建议的更改。这不起作用,因为它返回5已知的runner和5 = 5的值,因此建议的更新通过,新的成员和角色保存到数据库,没有错误。
会员模特:
class Member < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
attr_accessible :password, :password_confirmation, :remember_me
attr_accessible :age, :email, :first_name, :last_name, :sex, :shirt_size, :team_id, :assignments_attributes, :role_ids
belongs_to :team
has_many :assignments, :dependent => :destroy
has_many :roles, through: :assignments
accepts_nested_attributes_for :assignments
scope :runner, joins(:roles).where('roles.title = ?', "Runner")
scope :captain, joins(:roles).where('roles.title = ?', "Captain")
validate :validate_runner_count
validate :validate_captain_count
validates :role_ids, :presence => true
def validate_runner_count
if Team.find(self.team_id).members.runner.count > 5
errors.add(:role_id, 'Error - Max runner limit reached')
end
end
def validate_captain_count
if Team.find(self.team_id).members.captain.count > 1
errors.add(:role_id, 'Error - Max captain limit reached')
end
end
def has_role?(role_sym)
roles.any? { |r| r.title.underscore.to_sym == role_sym }
end
end
会员控制员:
class MembersController < ApplicationController
load_and_authorize_resource :team
load_and_authorize_resource :member, :through => :team
before_filter :get_team
before_filter :initialize_check_boxes, :only => [:create, :update]
def get_team
@team = Team.find(params[:team_id])
end
def index
respond_to do |format|
format.html # index.html.erb
format.json { render json: @members }
end
end
def show
respond_to do |format|
format.html # show.html.erb
format.json { render json: @member }
end
end
def new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @member }
end
end
def edit
end
def create
respond_to do |format|
if @member.save
format.html { redirect_to [@team, @member], notice: 'Member was successfully created.' }
format.json { render json: [@team, @member], status: :created, location: [@team, @member] }
else
format.html { render action: "new" }
format.json { render json: @member.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if @member.update_attributes(params[:member])
format.html { redirect_to [@team, @member], notice: 'Member was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @member.errors, status: :unprocessable_entity }
end
end
end
def destroy
@member.destroy
respond_to do |format|
format.html { redirect_to team_members_url }
format.json { head :no_content }
end
end
# Allow empty checkboxes
# http://railscasts.com/episodes/17-habtm-checkboxes
def initialize_check_boxes
params[:member][:role_ids] ||= []
end
end
_Form Partial
<%= form_for [@team, @member], :html => { :class => 'form-horizontal' } do |f| %>
#...
# testing the count...
<ul>
<li>Captain - <%= Team.find(@member.team_id).members.captain.size %></li>
<li>Runner - <%= Team.find(@member.team_id).members.runner.size %></li>
<li>Driver - <%= Team.find(@member.team_id).members.driver.size %></li>
</ul>
<div class="control-group">
<div class="controls">
<%= f.fields_for :roles do %>
<%= hidden_field_tag "member[role_ids][]", nil %>
<% Role.all.each do |role| %>
<%= check_box_tag "member[role_ids][]", role.id, @member.role_ids.include?(role.id), id: dom_id(role) %>
<%= label_tag dom_id(role), role.title %>
<% end %>
<% end %>
</div>
</div>
#...
<% end %>
答案 0 :(得分:1)
尝试
class Member < ActiveRecord::Base
...
def validate_runner_count
if self.team.members.runner.count > 5
errors.add(:role_id, 'Error - Max runner limit reached')
end
end
def validate_captain_count
if self.team.members.captain.count > 1
errors.add(:role_id, 'Error - Max captain limit reached')
end
end
end