Specify custom index name when using add_reference

Question

I have the following migration

class LinkDoctorsAndSpecializations < ActiveRecord::Migration
  def up
    add_reference :doctors, :doctor_specialization, poly         


        

Answer 1

This would actually work:

add_index :table, :column, name: 'index name'

Take a look for more examples.

Answer 2

I would not suggest leaving out "add_reference", but you could leave out the "index" option hash key and then use "add_index":

add_reference :table, :column
add_index :table, :column, :name => 'index_table_column'

Or, the more appropriate way would be like this:

add_reference :doctors, :doctor_specialization, polymorphic: true, index: { name: 'index_doctors_doctor_specialization' }

Answer 3

As I commented, do :

add_index :table, :column, name: 'index name' 

Here is documentation. Or, you can try this :

class LinkDoctorsAndSpecializations < ActiveRecord::Migration
  def change
    add_reference :doctors, :doctor_specialization, polymorphic: true, index: { name: 'index name' }
  end
end

Answer 4

I've heard the best way to fix this is to just leave it out of the add reference line and specify it manually below much like in the last line of your question

add_index :table, :column, :name => 'index name'