Ruby on rails Arel表关系划分

我将Rails 5.1与PostgreSQL 9.5结合使用，我对Arel表是新手。我正在尝试创建一个查询（我希望最终与其他scopes查询链接），该查询返回所有相关记录与给定输入匹配的记录

给定一个

工作日ID数组：[1,2,5,6]

，只返回具有活动

时隙的
范围
，该范围匹配所有
工作日ID

型号

class Range < ApplicationRecord
  has_many :time_slots
end

class TimeSlot < ApplicationRecord
  belongs_to :range
  belongs_to :weekday
end

def self.qualified_time_slots(weekday_ids = nil)
  weekday_ids ||= [1, 2, 5, 6]

  qualified_ranges = Range.includes(:time_slots).all.map do |range|
    active_time_slots = range.time_slots.where(active: true)
    range if weekday_ids.all? { |day| active_time_slots.map(&:weekday_id).include? day }
  end

  # return
  qualified_ranges.compact
end

当前在Arel查询中的非工作尝试，以实现与上述方法相同的效果

Range.joins(
  :time_slots
).where(
  time_slots: { active: true }
).where(
  TimeSlot.arel_table[:weekday_id].in(weekday_ids)
)

预期结果

# Should return:
[
  range: {
    id: 1, 
    time_slots: [
      { weekday_id: 1 },
      { weekday_id: 2 },
      { weekday_id: 5 },
      { weekday_id: 6 },
    ]
  },
  range: {
    id: 2, 
    time_slots: [
      { weekday_id: 0 },
      { weekday_id: 1 },
      { weekday_id: 2 },
      { weekday_id: 3 },
      { weekday_id: 4 },
      { weekday_id: 5 },
      { weekday_id: 6 },
    ]
  }
]


# Should NOT return 
[
  range: {
    id: 3, 
    time_slots: [
      { weekday_id: 1 },
      { weekday_id: 2 },
      { weekday_id: 5 },
    ]
  },

  range: {
    id: 4, 
    time_slots: [
      { weekday_id: 0 },
      { weekday_id: 6 },
    ]
  }
]

编辑-在进行这项工作时，我遵循了a中的示例，创建了这个原始SQL查询，它似乎可以工作，但尚未经过彻底测试：

ActiveRecord::Base.connection.exec_query("
  SELECT 
    ts.range_id
  FROM 
    time_slots AS ts
  WHERE 
    ts.active = true
  AND 
    ts.weekday_id IN (#{weekday_ids.join(',')})
  GROUP BY 
    ts.range_id 
  HAVING COUNT(weekday_id) >= #{weekday_ids.length};
")

我仍在测试此功能，但它似乎正在工作：

Range.joins(
  :time_slots
).where(
  TimeSlot.arel_table[:active].eq(
    true
  ).and(
    TimeSlot.arel_table[:weekday_id].in(
      weekday_ids
    )
  )
).group(
  Range.arel_table[:id]
).having(
  TimeSlot.arel_table[:weekday_id].count(true).gteq(weekday_ids.count)
)

在

s中链接

是否有效？我怀疑链接它们会导致出现and，不确定，只是一个猜测，没有足够的时间来测试和正确回答。无论如何，您需要and，而不是OR