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# This patches ActiveRecord so indexes for binary columns created using the
# MySQL adapter apply a length of 20. Otherwise MySQL can't create an index on
# binary columns.
# This module can be removed once a Rails 5 schema is used.
# It can't be wrapped in a check that checks Gitlab.rails5? because
# the old Rails 4 schema layout is still used
module MysqlSetLengthForBinaryIndex
def add_index(table_name, column_names, options = {})
options[:length] ||= {}
Array(column_names).each do |column_name|
column = ActiveRecord::Base.connection.columns(table_name).find { |c| c.name == column_name }
if column&.type == :binary
options[:length][column_name] = 20
end
end
super(table_name, column_names, options)
end
end
if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryIndex)
end
if Gitlab.rails5?
module MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema
# This method is used in Rails 5 schema loading as t.index
def index(column_names, options = {})
options[:length] ||= {}
Array(column_names).each do |column_name|
column = columns.find { |c| c.name == column_name }
if column&.type == :binary
options[:length][column_name] = 20
end
end
# Ignore indexes that use opclasses,
# also see config/initializers/mysql_ignore_postgresql_options.rb
unless options[:opclasses]
super(column_names, options)
end
end
end
if defined?(ActiveRecord::ConnectionAdapters::MySQL::TableDefinition)
ActiveRecord::ConnectionAdapters::MySQL::TableDefinition.send(:prepend, MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema)
end
end
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