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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.
module MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema
# This method is used in Rails 5 schema loading as t.index
def index(column_names, options = {})
# Ignore indexes that use opclasses,
# also see config/initializers/mysql_ignore_postgresql_options.rb
if options[:opclasses]
warn "WARNING: index on columns #{column_names} uses unsupported option, skipping."
return
end
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
super(column_names, options)
end
end
if defined?(ActiveRecord::ConnectionAdapters::MySQL::TableDefinition)
ActiveRecord::ConnectionAdapters::MySQL::TableDefinition.send(:prepend, MysqlSetLengthForBinaryIndexAndIgnorePostgresOptionsForSchema)
end
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