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I have this testingdatabase which, by now, is stuffed with junk. Now I've done a few Table.destroy_all commands in the rails console which deletes all records and dependencies which is awesome. However; I'd like to truncate everything so the ID's etc. start at 1 again. Is there any way in Rails 3?
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The SQL TRUNCATE TABLE command is used to delete complete data from an existing table. You can also use DROP TABLE command to delete complete table but it would remove complete table structure form the database and you would need to re-create this table once again if you wish you store some data.
During development, you might find yourself needing to delete everything from a specific database table to refresh your data. You could drop the whole database and bring it back up again with rake:db:drop, rake:db:setup , but that's slow and indiscriminate.
To truncate a table, the table must be in your schema or you must have the DROP ANY TABLE system privilege. To specify the CASCADE clause, all affected child tables must be in your schema or you must have the DROP ANY TABLE system privilege. Specify the schema and name of the table to be truncated.
The accepted answer only works if you need to recreate the whole database.
To drop a single table (with the callbacks) and to get the IDs to start from 1:
Model.destroy_all # Only necessary if you want to trigger callbacks. ActiveRecord::Base.connection.execute("TRUNCATE #{table_name} RESTART IDENTITY") If you are using Sqlite, it does not support truncate so do the following:
Model.destroy_all # Only necessary if you want to trigger callbacks. ActiveRecord::Base.connection.execute("Delete from #{table_name}") ActiveRecord::Base.connection.execute("DELETE FROM SQLITE_SEQUENCE WHERE name='#{table_name}'") If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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