Rails ActiveRecord::Migration what is the difference between index: true and add_index?

Question

What is the difference between

t.boolean :is_live, index: true

and

add_index :table_name, :is_live

If there i

Answer 1

In short: both do the same job. ìndex: true` just saves you an additional line. Look here https://github.com/rails/rails/pull/5262#issuecomment-4329571

Answer 2

Just found out that the :index option is for references only (t.references or t.belongs_to). For 'ordinary' column types this option is ignored (that's why indices are not reflected in your schema.db when you used the :index option).

For less verbose syntax there is an index type:

t.index :column_name # extra options may be provided also