mobilizon/priv/repo/migrations/20180802133951_make_follower_table_unique.exs

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defmodule Mobilizon.Repo.Migrations.MakeFollowerTableUnique do
use Ecto.Migration
def up do
create(
unique_index(:followers, [:actor_id, :target_actor_id],
name: :followers_actor_target_actor_unique_index
)
)
end
def down do
drop(
index(:followers, [:actor_id, :target_actor_id],
name: :followers_actor_target_actor_unique_index
)
)
end
end