Migration Add_index Rails

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add_index(table _name, column_names. There is a special syntactic shortcut to generate migrations that add fields to a table. rails generate migration add.

2016年3月2日. rake db:migrate して、検証のために rake db:rollback したところエラーで怒られたので. ruby 2.2.3p173 Rails : Rails 4.2.1 状況既存のインデックスにUNIQUE. def change remove_index :companies, :url add_index :companies, :url,

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Active Record Migrations — Ruby on Rails Guides – The bin/rails tasks that manipulate migrations and your schema. How migrations relate to schema.rb. Chapters. Migration Overview;. add_index, and so on.

How to fix the Index name too long error in rails migrations | Today I. – Mar 16, 2017. How to fix Rails migration error when your database table index name is too long. ActiveRecord::Migration def change add_index.

説明. 指定したテーブルにインデックスを追加. 使い方. add_index(テーブル名, インデックスを付与するカラム名 [, オプション]) change_tabe テーブル名 do |t| t.index.

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Jul 17, 2014. Rails model validations more often takes care of this, but it is. class CreateUniqueIndexForPayments < ActiveRecord::Migration def change add_index :payments, In Rails 4.x there is in built suppot for the above migration.

Apr 17, 2014. It can only automatically reverse migrations with a limited set of instructions. For example, add_column , add_index , create_table , and so on.

Several Rails migration methods accept index: true as an option to create an index. In some cases (like. Know what you are doing, or use #add_index instead.

You can still add an index as a part of a "change" migration. You just have to do it outside of the call to create_table: class CreateStatistics < ActiveRecord.

Active Record Basics. This guide is an introduction to Active Record. After reading this guide, you will know: What Object Relational Mapping and Active Record are.