has_many通过范围条件

我是Rails的新手，并有条件关于has_many :through关系的问题。我想在FacebookUser模型中有一个:joined_groups关系。 joined_groups将通过GroupInvite表格满足条件where(accepted: true)。不过，我不知道如何用Rails来完成这个任务，或者如果这是做到这一点的正确方法。我有以下型号...has_many通过范围条件

Group.rb

class Group < ActiveRecord::Base 
    attr_accessible :description, :name 

    ... 

    #Relationships 
    has_many :group_invites, class_name: 'GroupInvite' 
    has_many :facebook_users, class_name: 'FacebookUser', :through => :group_invites, :source => :facebook_user 
end

GroupInvite.rb

class GroupInvite < ActiveRecord::Base 
    attr_accessible :accepted, :facebook_user_uid, :group_id, :admin 

    ...  

    #Relationships 
    belongs_to :group 
    belongs_to :facebook_user, :foreign_key => :facebook_user_uid, :primary_key => :facebook_user_uid 

    #Scopes 
    scope :pending, where(accepted: nil) 
    scope :declined, where(accepted: false) 
    scope :joined, where(accepted: true) 
end

FacebookUser

class FacebookUser < ActiveRecord::Base 

    #Attributes 
    attr_accessible :first_name, :gender, :last_name, :uid 

    ... 

    has_many :group_invites, class_name: 'GroupInvite', :primary_key => :uid, :foreign_key => :facebook_user_uid 
    has_many :groups, class_name: 'Group', :through => :group_invites, :source => :group 
    ... 
end

任何帮助将不胜感激！

来源

2013-06-04 Stefan Bossbaly

你可以试试这个：

has_many :accepted_group_invites, class_name: 'GroupInvite', :primary_key => :uid, :foreign_key => :facebook_user_uid, :conditions => { :accepted => true }

马塔

来源

2013-06-04 05:57:49

has_many通过范围条件

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