如果条件不正确，我想创建一个before_filter，将用户重定向到另一个页面。
我有四种模式：
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player都可以通过创建match加入inscription。然后，每个player可以记录其他人，因为他们一起玩了很多次，但不是更多。
我想阻止player能够比其他人一起玩的次数多注意其他玩家。
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
但这并不像我想要的那样发挥......似乎没有限制。
我希望你能理解我。谢谢你读我。