Merge pull request #7 from weareyipyip/add-no-assoc-error

Add association exists error

lib/cose_della_vita_ex/error_mapper.ex

@@ -16,7 +16,8 @@ defmodule CoseDellaVitaEx.ErrorMapper do
     TokenInvalidError,
     UniqueConstraintError,
     WrongPasswordError,
-    RequireOneOfError
+    RequireOneOfError,
+    AssociationExistsError
   }
 
   require Logger
@@ -77,6 +78,9 @@ defmodule CoseDellaVitaEx.ErrorMapper do
   def map_default(%{constraint: :assoc}, _message), do: %NotFoundError{}
   def map_default(%{constraint: :foreign}, _message), do: %NotFoundError{}
 
+  def map_default(%{constraint: :no_assoc, constraint_name: constraint_name}, _message),
+    do: %AssociationExistsError{constraint_name: constraint_name}
+
   def map_default(opts, message) do
     Logger.warning(
       "Unknown changeset validation type, defaulting to a generic GraphQL error. Defining a specific error type will improve the API's type strength and usability. Full opts: #{inspect(opts)}"

lib/cose_della_vita_ex/errors/ecto_changeset/association_exists_error.ex

@@ -0,0 +1,21 @@
+defmodule CoseDellaVitaEx.Errors.AssociationExistsError do
+  @message "An association still exists, preventing this entity from being deleted."
+  @moduledoc """
+  #{@message}
+
+  Absinthe type is `:association_exists_error`.
+  """
+  use Absinthe.Schema.Notation
+
+  defstruct [:constraint_name, :path, message: @message, error_type: :association_exists_error]
+
+  @type t :: %__MODULE__{}
+
+  @desc @message
+  object :association_exists_error do
+    @desc "Name of the constraint."
+    field(:constraint_name, non_null(:string))
+    interface(:error)
+    import_fields(:error)
+  end
+end

lib/cose_della_vita_ex/schema.ex

@@ -22,6 +22,7 @@ defmodule CoseDellaVitaEx.Schema do
       import_types(CoseDellaVitaEx.Errors.TokenInvalidError)
       import_types(CoseDellaVitaEx.Errors.UniqueConstraintError)
       import_types(CoseDellaVitaEx.Errors.WrongPasswordError)
+      import_types(CoseDellaVitaEx.Errors.AssociationExistsError)
     end
   end
 end