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Editorial Team
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Asked: 2026-05-17T21:55:16+00:00

How does one create a Rails migration properly so that a table gets changed

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How does one create a Rails migration properly so that a table gets changed to MyISAM in MySQL? It is currently InnoDB. Running a raw execute statement will change the table, but it won’t update db/schema.rb, so when the table is recreated in a testing environment, it goes back to InnoDB and my fulltext searches fail.

How do I go about changing/adding a migration so that the existing table gets modified to MyISAM and schema.rb gets updated so my db and respective test db get updated accordingly?

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  1. Editorial Team

    I didn’t find a great way to do this. You could change your schema.rb like someone suggested and then run: rake db:schema:load, however, this will overwrite your data.

    The way I did it was (assuming you are trying to convert a table called books):

    1. Save the existing data from the CLI: CREATE TABLE tmp SELECT * FROM books;

    2. In your new migration file, drop the books table and recreate it with :options => "ENGINE=MyISAM" like someone said in the comment

    3. Copy the contents back: INSERT INTO books SELECT * FROM tmp

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