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Editorial Team
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Asked: 2026-05-12T22:45:00+00:00

As a follow-on to an earlier question about not reloading a huge, persistent table

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As a follow-on to an earlier question about not reloading a huge, persistent table when I run my tests, I need to keep this table out of schema.rb when I run my migrations. This table gets loaded directly from a mysqldump, so I’m not worried about keeping track of it.

So, how can I keep a specific table out of schema.rb?

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  1. Editorial Team

    Turns out there’s an option for just this situation!

    I found it in activerecord-2.3.4/lib/active_record/schema_dumper.rb:

    ##
# :singleton-method:
# A list of tables which should not be dumped to the schema. 
# Acceptable values are strings as well as regexp.
# This setting is only used if ActiveRecord::Base.schema_format == :ruby
cattr_accessor :ignore_tables 
@@ignore_tables = []

    So all I had to do was stick this at the end of environment.rb:

    ActiveRecord::SchemaDumper.ignore_tables = ["table_name"]

    If ActiveRecord.schema_format == :ruby, the array can also contain RegExp. For example, to ignore all tables starting with "MS":

    ActiveRecord::SchemaDumper.ignore_tables = [/^MS/]
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