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December 11, 2015 02:49
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Changing a non-primary-key column to a Rails-standard `id` primary key column, and back down again
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| def up | |
| rename_column :table_name, :old_id_col, :id | |
| change_column :table_name, :id, :primary_key | |
| end | |
| def down | |
| rename_column :table_name, :id, :old_id_col | |
| change_column :table_name, :old_id_col, :integer, :null => true | |
| remove_column :table_name, :id | |
| end |
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Given a table with no primary key set, change the name of the column, then set that column as the primary key. Tricky part here is migrating down, where we have to rename the column to be the old column name, change that column to be an int with
:null => true, then remove the id column, because for some reason the rename column isn't removing that ID column