ruby-on-rails - 具有多个条件的 Rails 4 范围

Question

我想在 1 天内显示活跃用户。

成员模型和范围:

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

但是，当我调用

@member = User.active

呈现以下错误:

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

请指教。

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，但您定义范围的方式存在问题。在你这样做之前，你定义局部变量 time_range。但问题是，您在 ActiveRecord 类的主体中定义了它，因此它只会在生产环境中被评估一次，即类被加载时。您应该在 lambda 中评估您的时间范围:

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