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Introduce new patterns for direct sql that are safe and fast. MiniSql is not prone to memory bloat that can happen with direct PG usage. It also has an extremely fast materializer and very a convenient API - DB.exec(sql, *params) => runs sql returns row count - DB.query(sql, *params) => runs sql returns usable objects (not a hash) - DB.query_hash(sql, *params) => runs sql returns an array of hashes - DB.query_single(sql, *params) => runs sql and returns a flat one dimensional array - DB.build(sql) => returns a sql builder See more at: https://github.com/discourse/mini_sql
29 lines
555 B
Ruby
29 lines
555 B
Ruby
class MakePostNumberDistinct < ActiveRecord::Migration[4.2]
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def up
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DB.exec('update posts p
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set post_number = calc
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from
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(
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select
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id,
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post_number,
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topic_id,
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row_number() over (partition by topic_id order by post_number, created_at) calc
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from posts
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where topic_id in (
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select topic_id from posts
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group by topic_id, post_number
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having count(*)>1
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)
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) as X
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where calc <> p.post_number and X.id = p.id')
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end
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def down
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# don't want to mess with the index ... its annoying
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raise ActiveRecord::IrreversibleMigration
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end
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end
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