Ruby on rails 通过方法链接将方法合并到一个散列

我有一个类正在为数据库生成查询：

它们应该连接在一起，所以我不会重复查询代码（DRY）

我想我可以这样做：

红宝石

结果应该是一个散列：

    {user_id: 1, scope: false}

---

您只需要创建作用域

class Blah < ActiveRecord::Base
  scope :no_scope, -> {all}
  scope :for_user, -> (user_id) {where(user_id: user_id)} 

end


Blah.no_scope.for_user(1) #  where(user_id: 1)

class Blah{all}
作用域：for_user，->（user_id）{where（user_id:user_id）}
结束
Blah.无范围。用于用户（1）#其中（用户id:1）

---

另请参见

您是否试图实现此目标

class Blah < ActiveRecord::Base
  scope :no_scope, -> { where(scope: false) }
  scope :for_user, -> (id) { where(user_id: id) }
end

Blah.no_scope.for_user(1) #  where(scope: false, user_id: 1)

class Blah{where（作用域：false）}
作用域：for_user，->（id）{where（user_id:id）}
结束
Blah.no_scope.for_user（1）#where（scope:false，user_id:1）

要将结果作为实际哈希而不是Activerecord关系给出，可以这样做

class Blah < ActiveRecord::Base
  scope :no_scope, ->{where(scope: false)}
  scope :for_user, ->(id){where(user_id: id)} # no space in ->(id)
end

# give results as an array of hashes
Blah.no_scope.for_user(1).map { |e| {scope: e.scope, user_id: e.user_id} }

class Blah < ActiveRecord::Base
  scope :no_scope, -> { where(scope: false) }
  scope :for_user, -> (id) { where(user_id: id) }
end

Blah.no_scope.for_user(1) #  where(scope: false, user_id: 1)

class Blah < ActiveRecord::Base
  scope :no_scope, ->{where(scope: false)}
  scope :for_user, ->(id){where(user_id: id)} # no space in ->(id)
end

# give results as an array of hashes
Blah.no_scope.for_user(1).map { |e| {scope: e.scope, user_id: e.user_id} }

[{"scope"=>false, "user_id"=>1}]