Rails Migration Change Index Unique

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May 19, 2015. Forgetting to add an index to a column in your migration is hardly a fatal. class DropUsers < ActiveRecord::Migration def change drop_table :users. add_column :users, :email, :string add_index :users, :email, unique: true.

Newest ‘ruby-on-rails’ Questions – Stack Overflow – I want my Index to change according to Price descending and Price ascending. Right now, I send an ajax request to the site, with the new value of the select.

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When you create an index using Ruby on Rails migration, by default it would be. set a column as a primary key, the database would build a unique index on it.

Mar 16, 2012. So let's say we want to add an indexed body and unique person id to the. rails g migration add_body_and_pid_to_people body:string:index.

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Jul 17, 2014. class CreatePayments < ActiveRecord::Migration def change. to add a unique index to ensure that duplicates are avoided at the db level.