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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
59 lines
1.4 KiB
Ruby
59 lines
1.4 KiB
Ruby
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class CommentMigration < ActiveRecord::Migration[4.2]
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def comments_up
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raise "Not implemented"
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end
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def up
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comments_up.each do |table|
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table[1].each do |column|
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table_name = table[0]
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column_name = column[0]
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comment = column[1]
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if column_name == :_table
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DB.exec "COMMENT ON TABLE #{table_name} IS ?", comment
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puts " COMMENT ON TABLE #{table_name}"
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else
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DB.exec "COMMENT ON COLUMN #{table_name}.#{column_name} IS ?", comment
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puts " COMMENT ON COLUMN #{table_name}.#{column_name}"
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end
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end
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end
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end
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def comments_down
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{}
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end
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def down
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replace_nils(comments_up).deep_merge(comments_down).each do |table|
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table[1].each do |column|
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table_name = table[0]
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column_name = column[0]
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comment = column[1]
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if column_name == :_table
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DB.exec "COMMENT ON TABLE #{table_name} IS ?", comment
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puts " COMMENT ON TABLE #{table_name}"
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else
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DB.exec "COMMENT ON COLUMN #{table_name}.#{column_name} IS ?", comment
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puts " COMMENT ON COLUMN #{table_name}.#{column_name}"
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end
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end
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end
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end
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private
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def replace_nils(hash)
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hash.each do |key, value|
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if Hash === value
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hash[key] = replace_nils value
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else
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hash[key] = nil
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end
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end
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end
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end
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