协会的范围 - Rails 4

如果有人能帮我写一个范围，显示参加活动的女性人数（女性），我将非常感激。协会的范围 - Rails 4

模型

user.rb

belongs_to :category_gender 
has_many :payments

category_gender.rb

has_many :users

event.rb

belongs_to :user 
has_many :payments

payment.rb

belongs_to :user 
belongs_to :event

终端

event = Event.find(7) 
event_payments = event.payments 

2.3.0 :054 > event_payments 
[ 
    [0] #<Payment:0x007fea72ac5b70> { 
           :id => 6, 
          :email => "[email protected]", 
          :user_id => 4, 
         :reference => "SPz_ruZ5om", 
         :created_at => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
         :updated_at => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
         :event_id => 7, 
       :stripe_customer_id => "cus_9YuZZAniFCZVxn", 
       :stripe_payment_id => "ch_19GTpnAAe71J3vK0aj1gKryO", 
       :event_payment_date => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
          :status => "success" 
    } 
    [1] #<Payment:0x007fea72ac5b70> { 
           :id => 7, 
          :email => "[email protected]", 
          :user_id => 5, 
         :reference => "SPz_mnX4ul", 
         :created_at => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
         :updated_at => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
         :event_id => 7, 
       :stripe_customer_id => "cus_6FhLLMotYCCYvn", 
       :stripe_payment_id => "ch_20GTunDDt87J3vK1sp4gPry9", 
       :event_payment_date => Wed, 16 Nov 2016 13:52:23 UTC +00:00, 
          :status => "success" 
    } 
]

我如何写一个范围，找到女性的事件下所取得的所有款项？

如果我写了下面我可以找到一名女子的首付款：

event.payments.first.user.category_gender.name 

2.3.0 :026 > event.payments.first.user.category_gender.name 
    Payment Load (0.2ms) SELECT "payments".* FROM "payments" WHERE "payments"."event_id" = ? ORDER BY "payments"."id" ASC LIMIT 1 [["event_id", 7]] 
    User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 4]] 
    CategoryGender Load (0.1ms) SELECT "category_genders".* FROM "category_genders" WHERE "category_genders"."id" = ? LIMIT 1 [["id", 2]] 
=> "Female"

我尝试了以下范围显示由女性的事件做出的所有款项，但没有运气 - 尝试了方法，但没有运气。您的帮助和解释，将不胜感激对谁写的这是一个范围和方法：

event.rb

scope :females, -> { joins(payment: :category_gender).where('category_genders.name' => "Female") } 

def females 
    self.payments.where('user.category_gender.name = ?', "Female") 
end

错误消息：

2.3.0 :004 > event.females 
    Payment Load (1.7ms) SELECT "payments".* FROM "payments" WHERE "payments"."event_id" = ? AND (user.category_gender.name = 'Female') [["event_id", 7]] 
SQLite3::SQLException: no such column: user.category_gender.name: SELECT "payments".* FROM "payments" WHERE "payments"."event_id" = ? AND (user.category_gender.name = 'Female') 
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: user.category_gender.name: SELECT "payments".* FROM "payments" WHERE "payments"."event_id" = ? AND (user.category_gender.name = 'Female')

来源

2016-11-17 ARTLoe

class Payment 
    scope :by_females, -> { joins(user: :category_gender).where(category_genders: { name: 'Female' }) } 
end

现在简单易用：

event.payments.by_females

来源

2016-11-17 16:14:13

at andrey谢谢你soo !!完美作品 – ARTLoe

@ARTLoe欢迎:) –

协会的范围 - Rails 4

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