Question

我想在1天内向活跃用户展示。

会员模型和范围：

time_range = (Time.now - 1.day)..Time.now
scope :active, -> { where(created_at: time_range, gold_member: true, registered: true) }

然而，当我打电话

@member = User.active

呈现以下错误：

NoMethodError: undefined method `call' for #<User::ActiveRecord_Relation:0x07fe068>

请告知。

回溯：

  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activerecord-4.1.7/lib/active_record/relation/delegation.rb:136:in `method_missing'
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activerecord-4.1.7/lib/active_record/relation/delegation.rb:99:in `method_missing'
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activerecord-4.1.7/lib/active_record/scoping/named.rb:151:in `block (2 levels) in scope'
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activerecord-4.1.7/lib/active_record/relation.rb:292:in `scoping'
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activerecord-4.1.7/lib/active_record/scoping/named.rb:151:in `block in scope'
  from (irb):48
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/railties-4.1.7/lib/rails/commands/console.rb:90:in `start'
  from /Users/jason/.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/railties-4.1.7/lib/rails/commands/console.rb:9:in `start'

Answer 1

它不会修复您的错误，但是您定义范围的方式存在问题。在执行此操作之前，您需要定义局部变量time_range。但问题是，您在ActiveRecord类的主体中定义它，因此在加载类时，它将仅在生产环境中进行一次计算。你应该评估你在lambda内的时间范围：

scope :active, -> {
  where(created_at: (Time.now - 1.day)..Time.now, gold_member: true, registered: true)
}

Rails 4具有多个条件的范围

1 个答案: