6fa548e427
- PostgreSQL doesn't allow double quotes for values. Double quotes are used for surrounding table names that contain spaces. Single quotes should be used for values. - DELETE in a JOIN is not permitted in SQL-99 (see http://drupal.org/node/555562) so we use USING with WHERE instead
47 lines
1.5 KiB
Ruby
47 lines
1.5 KiB
Ruby
# NOTE: this migration will remove a lot of unused rows. It is highly suggested
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# that you run `OPTIMIZE TABLE share_visibilities` after this
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# `OPTIMIZE NO_WRITE_TO_BINLOG TABLE share_visibilities;` will run faster but has a greater chance of corrupting data
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# and will only work on an unsharded database (which should be the case for everyone right now)
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# you probably want to backup your db before you do any of this.
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# migration is complete.
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#
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# caution: you may want to take your pod offline during the OPTIMIZE command.
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class RemovePublicShareVisibilities < ActiveRecord::Migration
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def self.up
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%w{Post Photo}.each do |type|
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index = 0
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table_name = type.tableize
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if postgres?
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shareable_size = ActiveRecord::Base.connection.execute("SELECT COUNT(*) FROM #{table_name}").first['count'].to_i
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else
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shareable_size = ActiveRecord::Base.connection.execute("SELECT COUNT(*) FROM #{table_name}").first.first
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end
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while index < shareable_size + 100 do
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sql = <<-SQL
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DELETE
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FROM share_visibilities AS sv
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USING #{table_name} as p
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WHERE sv.shareable_id = p.id
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AND sv.shareable_type = '#{type}'
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AND p.public IS TRUE
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AND p.id < #{index};
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SQL
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puts "deleted public share vis up to #{index} of #{type}"
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ActiveRecord::Base.connection.execute(sql)
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index += 100
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end
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end
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end
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def self.down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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