Initial commit

lib/code_corps/accounts/accounts.ex

@@ -31,6 +31,7 @@ defmodule CodeCorps.Accounts do
     |> Changeset.change(params |> Adapters.User.from_github_user())
     |> Changeset.put_change(:context, "github")
     |> Changeset.unique_constraint(:email)
+    |> Changeset.unique_constraint(:github_id)
     |> Changeset.validate_inclusion(:type, ["bot", "user"])
   end
 end

lib/code_corps/github/user.ex

@@ -48,6 +48,7 @@ defmodule CodeCorps.GitHub.User do
       |> Changeset.change(user_payload |> UserAdapter.from_github_user)
       |> Changeset.put_change(:github_auth_token, access_token)
       |> Changeset.validate_required([:github_auth_token, :github_avatar_url, :github_id, :github_username])
+      |> Changeset.unique_constraint(:github_id)
 
     multi =
       Multi.new

priv/repo/migrations/20171003134956_add_unique_constraint_to_users_github_id.exs

@@ -0,0 +1,7 @@
+defmodule CodeCorps.Repo.Migrations.AddUniqueConstraintToUsersGithubId do
+  use Ecto.Migration
+
+  def change do
+    create index(:users, [:github_id], unique: true)
+  end
+end