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You have to drop the foreign key. Foreign keys in MySQL automatically create an index on the table (There was a SO Question on the topic). ALTER TABLE mytable DROP.
Active Record Migrations — Ruby on Rails Guides – A primary key column called id will also be added implicitly, as it's the default primary key. This migration will create a user_id column and appropriate index.
Several Rails migration methods accept index: true as an option to create an. boolean | age | integer | Indexes: "examples_pkey" PRIMARY KEY, btree (id).
Apr 18, 2014. has not NULL constraint; has UNIQUE contraint; has index. class CreateProducts < ActiveRecord::Migration def change create_table :products do | t|. We can tell Rails not to create column id by parsing id: false options.
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Feb 16, 2012. Rails automatically adds an index to the id field of a database table, but in this case. a migration to index to the users email column class.
Aug 21, 2011. Adding a primary key will automatically create a unique btree index on. migrations, but I think wriing a migration that remove those indexes is.
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Aug 20, 2013. Luckily, PostgreSQL automatically creates an index for primary keys to enforce uniqueness. an primary key index using the btree type to index the id column. So that extra add_index line in the migration will make your.
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