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dynamic scope building and user definition/selection of scopes in ruby
Postgres doesn't support named aggregates in the HAVING clause of a query. This poses a problem when needing to filter by an aggregate in the HAVING clause, and select the named aggregate.
Given this birddog scope:
search.field :total_amount, :type => :decimal, :aggregate => 'SUM(amount)', :attribute => 'SUM(amount) AS total_amount'
this query should be generated
SELECT "user_dim"."guid" AS user_guid, SUM(amount) AS total_amount FROM "matched_transaction_facts" INNER JOIN "user_dim" ON "user_dim"."id" = "matched_transaction_facts"."user_id" WHERE "matched_transaction_facts"."merchant_id" = 1 AND ("matched_transaction_facts"."date_dim_id" >= 795) AND ("matched_transaction_facts"."date_dim_id" <= 825) GROUP BY "user_dim"."guid" HAVING SUM(amount) >= 20.0
Or so I think...
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