您可以加入 2 次integration_profiles 和集成,如下所示:
Profile
.joins("INNER JOIN integration_profiles AS ip_csv ON ip_csv.profile_id = profiles.id")
.joins("INNER JOIN integrations AS i_csv ON i_csv.id = ip_csv.integration_id")
.joins("INNER JOIN integration_profiles AS ip_kickstarter ON ip_kickstarter.profile_id = profiles.id")
.joins("INNER JOIN integrations AS i_kickstarter ON i_kickstarter.id = ip_kickstarter.integration_id")
.where("i_csv.provider='csv' AND i_kickstarter.provider='kickstarter'")
.pluck("profiles.id")
如果您想要一个更具可读性的查询,请定义两个范围,如下所示:
class Profile < ActiveRecord::Base
has_many :integration_profiles
has_many :integrations, through: :integration_profiles
scope :csv, ->{joins(:integrations).where(integrations: { provider: 'csv' })}
scope :kickstarter, ->{joins(:integrations).where(integrations: { provider: 'kickstarter' })}
end
进而:
Profile.csv.where(id: Profile.kickstarter.pluck(:id) ).pluck(:id)
您最终会得到 2 个查询,但这读起来要好得多。
SELECT "profiles"."id" FROM "profiles"
INNER JOIN "integration_profiles" ON "integration_profiles"."profile_id" = "profiles"."id"
INNER JOIN "integrations" ON "integrations"."id" = "integration_profiles"."integration_id"
WHERE "integrations"."provider" = 'kickstarter'
SELECT "profiles"."id" FROM "profiles"
INNER JOIN "integration_profiles" ON "integration_profiles"."profile_id" = "profiles"."id"
INNER JOIN "integrations" ON "integrations"."id" = "integration_profiles"."integration_id"
WHERE "integrations"."provider" = 'csv' AND "profiles"."id" IN (1, 3)
如果您只需要配置文件的 ID,您可以采用另一条路径:从integration_profiles 中提取 profile_id:
class Integration < ActiveRecord::Base
has_many :integration_profiles
has_many :profiles, through: :integration_profiles
scope :csv, -> { where(provider: 'csv') }
scope :kickstarter, -> { where(provider: 'kickstarter') }
end
class IntegrationProfile < ActiveRecord::Base
belongs_to :integration
belongs_to :profile
end
IntegrationProfile.joins(:integration).csv.where(
profile_id: IntegrationProfile.joins(:integration).kickstarter.pluck(:profile_id)
).pluck(:profile_id)
这仍然会生成 2 个查询,但这些查询更简单:
SELECT "integration_profiles"."profile_id" FROM "integration_profiles"
INNER JOIN "integrations" ON "integrations"."id" = "integration_profiles"."integration_id"
WHERE "integrations"."provider" = 'kickstarter'
SELECT "integration_profiles"."profile_id" FROM "integration_profiles"
INNER JOIN "integrations" ON "integrations"."id" = "integration_profiles"."integration_id"
WHERE "integrations"."provider" = 'csv' AND "integration_profiles"."profile_id" IN (1, 3)