Ruby on rails 通过Rails访问多个上的附加值
我在访问has_many-through上名为permission的附加参数的值时遇到了实际问题。这可能很简单。 我的3个模型是Ruby on rails 通过Rails访问多个上的附加值,ruby-on-rails,activerecord,Ruby On Rails,Activerecord,我在访问has_many-through上名为permission的附加参数的值时遇到了实际问题。这可能很简单。 我的3个模型是 class User < ActiveRecord::Base has_many :players_users has_many :players, through: :players_users end class Player < ActiveRecord::Base has_many :players_users has_many :
class User < ActiveRecord::Base
has_many :players_users
has_many :players, through: :players_users
end
class Player < ActiveRecord::Base
has_many :players_users
has_many :users, through: :players_users
end
class PlayersUser < ActiveRecord::Base
belongs_to :user
belongs_to :player
validates :player_id, uniqueness: { scope: :user_id }
end
但是,我似乎无法正确访问它
我试过了
perm = User.find(current_user).players_users.includes(:Permission)
if perm == "owner"
它给出了一个ActiveRecord::AssociationNotFoundError,在PlayerUser上找不到名为“权限”的关联;也许你拼错了
我也试过了
perm = User.players_users.where(player_id = @player.id && user_id = current_user)
perm.permission
或
或
它给出了一个未定义的方法错误。
未定义的方法“Player”
我知道这在我的设置中很小,但无法确定它是什么。非常感谢您的帮助。
players\u用户
和玩家
与用户对象关联,因此您可以通过以下方式获取结果:
current_user.players_users.pluck(:permission)
我以前用自己的代码解决过这个问题
我马上就发布,但是首先你需要重构你的控制器,电流是低效的:
#app/controllers/players_controller.rb
class PlayersController < ApplicationController
def create
@player = current_user.players.new players_params
if @player.save
current_user.player_users.find(@player.id).update(permission: "owner")
redirect_to players_path
end
end
private
def player_params
params.require(:player).permit(....)
end
end
--
更多的方法(如果每次都将权限
明确设置为所有者
)是在播放器
模型中引入一个作为默认值:
#app/models/player.rb
class Player < ActiveRecord::Base
enum permission: [:owner, :member, :moderator] #-> defaults to :owner
end
要理解这一点,您必须记住,由于player\u users
是一个加入关联,ActiveRecord
将自动填充它,如果您在current\u user
对象(current\u user.players
)上创建一个播放器
关于提取
权限
数据,我构建了一个脚本,将权限附加到player
对象(使用proxy\u association.target
等):
它的工作原理与-类似,因此,虽然您无法操作数据,但它将允许您调用@user.players.find(params[:player\u id]。permission
。除非所有操作都在内存中完成:
#app/models/user.rb
类用户{扩展玩家权限}
结束
#app/models/concerns/player_permission.rb
模块播放权限
#装载
def负载
权限。每个do |权限|
proxy\u association.targetUser.find(当前用户)。players\u users.first.permission
将为您提供第一个player\u用户的权限值。如果您想要全部权限,请使用User.find(当前用户)。players\u users.first.pulk(:permission)
如果您有问题,请回答,我们会让它工作的Hi@RichPeck,谢谢您这么详细的回答,但是它仍然会为我抛出相同的权限错误。Hi@RichPeck,所有的工作都必须从头开始,遵循惯例,一定是在从复数转换回来时犯了一个错误。是的,作为一项规则,model应该始终是单数的(在所有情况下--ProductUser
)顺便问一下,你想让我帮你实现“代理关联”方法吗?这一切都在内存中需要稍微更改@permission=current\u user.players\u users.where(player\u id:params[:player\u id],user\u id:current\u user)。pulk(:permission)
current_user.players_users.pluck(:permission)
#app/controllers/players_controller.rb
class PlayersController < ApplicationController
def create
@player = current_user.players.new players_params
if @player.save
current_user.player_users.find(@player.id).update(permission: "owner")
redirect_to players_path
end
end
private
def player_params
params.require(:player).permit(....)
end
end
@permission = current_user.player_users.find(@player.id).permission
#app/models/player.rb
class Player < ActiveRecord::Base
enum permission: [:owner, :member, :moderator] #-> defaults to :owner
end
#app/controllers/players_controller.rb
class PlayersController < ApplicationController
def create
@player = current_user.players.new players_params
redirect_to players_path if @player.save
end
end
#current
@player = current_user.players.find params[:player_id]
@permission = current_user.player_users.find(params[:player_id]).permission
#script
@player = current_user.players.find params[:player_id]
@permission = @player.permission
#app/models/user.rb
class User < ActiveRecord::Base
has_many :player_users
has_many :players, through: :player_users, -> { extending PlayerPermission }
end
#app/models/concerns/player_permission.rb
module PlayerPermission
#Load
def load
permissions.each do |permission|
proxy_association.target << permission
end
end
#Private
private
#Permissions
def permissions
return_array = []
through_collection.each_with_index do |through,i|
associate = through.send(reflection_name)
associate.assign_attributes({permission: items[i]})
return_array.concat Array.new(1).fill( associate )
end
return_array
end
#######################
# Variables #
#######################
#Association
def reflection_name
proxy_association.source_reflection.name
end
#Foreign Key
def through_source_key
proxy_association.reflection.source_reflection.foreign_key
end
#Primary Key
def through_primary_key
proxy_association.reflection.through_reflection.active_record_primary_key
end
#Through Name
def through_name
proxy_association.reflection.through_reflection.name
end
#Through
def through_collection
proxy_association.owner.send through_name
end
#Captions
def items
through_collection.map(&:permission)
end
#Target
def target_collection
#load_target
proxy_association.target
end
end