Ruby on rails 如何编写Activerecord/Arel交叉点查询
我在PSQL中实现了这一点:Ruby on rails 如何编写Activerecord/Arel交叉点查询,ruby-on-rails,activerecord,Ruby On Rails,Activerecord,我在PSQL中实现了这一点: 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 "integrati
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'
INTERSECT
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'
我想将其转换为ActiveRecord查询或Arel
我试过:
Arel::Nodes::Intersect.new(
Profile.joins(:integrations).where(integrations: { provider: 'csv' }),
Profile.joins(:integrations).where(integrations: { provider: 'kickstarter' })
)
[Debug] Profile Load (408.2ms) SELECT "profiles".* 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' (pid:65570)
[Debug] Profile Load (1.9ms) SELECT "profiles".* 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' (pid:65570)
这是有效的:
有没有办法一步到位?或者是一种让ps输出结果的方法,它只输出一个Arel对象…您可以像这样加入2次集成配置文件和集成:
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")
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
如果希望查询更具可读性,请定义如下两个范围:
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")
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
您将得到两个查询,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,可以选择另一条路径:从集成配置文件中提取配置文件\u 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)
很好的回答,非常感谢!
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)