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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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The schema. rb serves mainly two purposes: It documents the final current state of the database schema. Often, especially when you have more than a couple of migrations, it's hard to deduce the schema just from the migrations alone.
It is a Ruby representation of your database; schema. rb is created by inspecting the database and expressing its structure using Ruby. It is database-agnostic (i.e. whether you use SQLite, PostgreSQL, MySQL or any other database that Rails supports, the syntax and structure will remain largely the same)
Unlike rake db:migrate that runs migrations that have not run yet, rake db:schema:load loads the schema that is already generated in db/schema. rb into the database. Always use this command when: You run the application for the first time.
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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