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Immigrant gives Rails a foreign key migration generator so you caneffortlessly find and add missing keys. This is particularly helpfulwhen you decide to add keys to an established Rails app.

Remember to add an index on any foreign key you create or generate. You can either use t.belongsto:, index: true in the create table migration, or add the index manually afterward. – Ackshaey Singh Aug 16 '15 at 15:48.

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Installation

Sep 25, 2019 When using the Shovel operator to add to a Collection, it will populate foreign key columns or even create a record in the join table with the two foreign keys for you. Rails automatically creates.
Sep 30, 2013 Stackoverflow provides a solution to change the type of the primary key, but it is lacking in some ways. Primarily, the schema file generated by Rails will now omit the necessary SQL instructions to actually make the custom primary key column a primary key in the database. Our Workaround.

Add the following to your Gemfile:

If you're using a version of Rails prior to 4.2, you'll also need theForeigner gem.

Usage

This will create a migration named AddKeys which will have add_foreign_keystatements for any missing foreign keys. Immigrant infers missing ones byevaluating the associations in your models (e.g. belongs_to, has_many, etc.).Only missing keys will be added; existing ones will never be altered orremoved.

Rake Task

To help you remember to add keys in the future, there's a handy raketask you can add to your CI setup. Just run rake immigrant:check_keys,and if anything is missing it will tell you about it and exit with anon-zero status.

Skipping associations

Immigrant.ignore_keys allows you to specify a list of keys that shouldbe ignored (both in the migration generator and the rake task). This isuseful if you have associations spanning databases.

Generate new ssh key mac. Just create an config/initializers/immigrant.rb file with something likethe following:

Considerations

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If the data in your tables is bad, then the migration will fail to run(obviously). IOW, ensure you don't have orphaned records before you try toadd foreign keys.

Known Issues

Immigrant currently only looks for foreign keys in ActiveRecord::Base'sdatabase. So if a model is using a different database connection and it hasforeign keys, Immigrant will incorrectly include them again in the generatedmigration. Immigrant.ignore_keys can be used to work around this.

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