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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
24 lines
676 B
Ruby
24 lines
676 B
Ruby
class ResolveDuplicateGroupNames < ActiveRecord::Migration[4.2]
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def up
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results = DB.query_single 'SELECT id FROM groups
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WHERE name ILIKE
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(SELECT lower(name)
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FROM groups
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GROUP BY lower(name)
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HAVING count(*) > 1);'
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groups = Group.where id: results
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groups.group_by { |g| g.name.downcase }.each do |key, value|
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value.each_with_index do |dup, index|
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dup.update! name: "#{dup.name[0..18]}_#{index + 1}" if index > 0
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end
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end
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end
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def down
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# does not reverse changes
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end
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end
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