Activerecord Migration Index Exists

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NOTE: This tutorial is for RoR 2. If you’re using RoR 3, please see additional details here. We’ve also posted an updated tutorial for Ruby on Rails 4.

You can specify the index name in your migration. add_index :users, :email, unique: true, name: 'my_index_name'.

Active Record Migrations. Migrations. After, the table will exist. Active Record. This migration will create a user_id column and appropriate index. For more.

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Rails Migrations: Check Existence and Keep Going? – Stack Overflow – Oct 29, 2009. For Rails 2.X, you can check the existence of columns with the following: columns ("[table-name]").index {|col| col.name == "[column-name]"}.

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Aug 22, 2014. class AddIndexToUsers < ActiveRecord::Migration def change remove_index : users, :id_number if index_exists?(:id_number) add_index :users.

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Feb 7, 2015. There is an index_exists? method on one of the ActiveRecord. It's worth noting, however, that this only returns true if an index exists that.

index_exists? (ActiveRecord::ConnectionAdapters. – APIdock – suppliers, :company_id) # Check an index on multiple columns exists index_exists?(:suppliers, [:company_id, :company_type]) # Check a unique index exists.