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如果条件不成立，我想创建一个 before_filter 将用户重定向到其他页面。

我有四个模型：

class Player < ActiveRecord::Base

  has_many :matches, through: :inscriptions
  has_many :inscriptions

class Inscription < ActiveRecord::Base

  belongs_to :match
  belongs_to :player

class Match < ActiveRecord::Base

  has_many :players, through: :inscriptions
  has_many :inscriptions

class Stat < ActiveRecord::Base
  belongs_to :player

每个人都player可以match通过创建一个inscription. 然后，每个人都player可以像他们一起打过一场比赛一样多次记录其他人，但不能更多。

我想防止 aplayer能够注意到其他玩家的次数超过他们一起玩的次数。

所以我有 ：

def is_noteable?(player)
    @matchs_du_joueur = Inscription.where(:player_id => current_user.id) 
    #all the `inscriptions` of a `match` from current_user

     @joueur = Player.joins(:inscriptions).where(:inscriptions => { :match_id => @matchs_du_joueur.map(&:match_id)}).group(:player_id).where('player_id <> ?', current_user.id)
    #all the `players`  that have played with `current_user`

    @combien_de_truc = Inscription.where(:match_id => @matchs_du_joueur.map(&:match_id), :player_id => @player.id).count 
    #to know how many `inscriptions` they have in a common `match`

    @combien_de_notes = Stat.where(:player_id => @player.id, :auteur => current_user.id).count 
    #to know how many times `current_user` has noted the player

    @combien_de_notes <= @combien_de_truc 
    #if `current_user` has  noted `player` less time than he played with him


    end

但这并不能如我所愿......似乎没有限制。

我希望你能理解我。谢谢你读我。

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