Mar 1, 2016. In Rails 5 the same command will generate following migration. sqlite>. schema users CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar, "created_at". There is no mention of index: true in the above migration. Why foreign key is not created ??
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Oct 5, 2009. Migrations in Ruby on Rails provide some nice faetures for manipulating database structure. There are no functions for easy creating foreign keys. that all data in a column is unique other than creating a unique index.
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May 19, 2015. Forgetting to add an index to a column in your migration is hardly a. Have you read the Rails guide on migrations?. Adding a foreign key?
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Aug 20, 2013. In general it's a good practice to add an index for the primary key in your tables. class CreateProducts < ActiveRecord::Migration def change. problem with rails applications is the lack of indexes on foreign keys. Luckily it's.
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Mar 4, 2016. foreign keys – always add indexes on foreign keys. rails generate model Author name:string rails generate model Book. time, we'll add the index (takes about 2 seconds for the migration to end) and then rerun the query.