Using MYSQL enum in ecto migrations

I figure out a workaround for this. After creating a table with ecto migration. I executed SQL command to alter the table and add the enum column like this:

create table(:users) do
  add(:business_id, :string, null: false, default: "")
end

execute "ALTER TABLE users
   ADD role ENUM('owner', 'worker', 'manager', 'pending_approval');"

If someone comes across this, “quoted atoms” has been an undocumented way of supporting this and other interesting things in MariaDB/MySQL, but it’s now documented:

create table("my_table") do
  # ...
  add :my_enum, :"ENUM('value1', 'value2', 'value3')", null: false
end

This is because the migrator just passes the stringified-atom through if it’s something it doesn’t specifically handle.