是否可以使用AREL获得下面SQL(PG)查询的相同结果?
SELECT (sd.subscription_data ->> 'id')::uuid FROM events qe
CROSS JOIN LATERAL jsonb_array_elements(subscriptions) AS sd(subscription_data)
WHERE sd.subscription_data ->> 'type' = 'Organization'
AND qe.slug = '#{event_slug}';
是的但它不漂亮
e = Arel::Table.new(:events)
sd = Arel::Table.new(:sd)
event_slug = 'event_slug'
join = Arel::Nodes::NamedFunction.new('json_b_array_elements',
[Arel::Nodes::SqlLiteral.new("subscriptions")])
.as(Arel::Nodes::NamedFunction.new('sd',
[Arel::Nodes::SqlLiteral.new("subscription_data")]).to_sql)
p = e.project(
Arel::Nodes::SqlLiteral.new(
Arel::Nodes::Grouping.new(
Arel::Nodes::InfixOperation.new('->>',
sd[:subscription_data],
Arel::Nodes::SqlLiteral.new("'id'"))).to_sql) << '::uuid'
).where(
Arel::Nodes::InfixOperation.new('->>',
sd[:subscription_data],
Arel::Nodes::SqlLiteral.new("'type'").eq(
Arel::Nodes::SqlLiteral.new("'Company'")
)
).and(e[:slug].eq(event_slug)))
p.join_sources << Arel::Nodes::StringJoin.new(
Arel::Nodes::SqlLiteral.new('CROSS JOIN LATERAL')) << join
p.to_sql
输出是
SELECT
([sd].[subscription_data] ->> 'id')::uuid
FROM
[events]
CROSS JOIN LATERAL json_b_array_elements(subscriptions) AS sd(subscription_data)
WHERE
[sd].[subscription_data] ->> 'type' = 'Company'
AND [events].[slug] = N'event_slug'"