fix error when API was called with unregistered module name (#148)

CHANGELOG.md

@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - decoding a single propery for `EdgeDB.Object` that equals to an empty set.
 - not catching an `EdgeDB.Error` exception during parameters encoding,
     which caused throwing an exception for non-`!` functions.
+- silent error for calling `EdgeDB` API with wrong module names.
 
 ### Removed
 

lib/edgedb.ex

@@ -895,9 +895,11 @@ defmodule EdgeDB do
   end
 
   defp to_client(client_name) when is_atom(client_name) do
-    client_name
-    |> Process.whereis()
-    |> to_client()
+    if pid = Process.whereis(client_name) do
+      to_client(pid)
+    else
+      raise EdgeDB.InterfaceError.new("could not find process associated with #{client_name}")
+    end
   end
 
   # ensure that client is really registered

lib/edgedb/borrower.ex

@@ -36,6 +36,11 @@ defmodule EdgeDB.Borrower do
   end
 
   @spec ensure_unborrowed!(EdgeDB.client()) :: :ok | no_return()
+
+  def ensure_unborrowed!(client) when is_pid(client) do
+    :ok
+  end
+
   def ensure_unborrowed!(client) do
     case GenServer.call(__MODULE__, {:check_borrowed, client}) do
       :unborrowed ->

test/edgedb/api_test.exs

@@ -563,4 +563,13 @@ defmodule Tests.EdgeDB.APITest do
       assert object[:user_type][:name] == "default::User"
     end
   end
+
+  test "EdgeDB API raises an error for wrong module name as a client" do
+    e =
+      assert_raise EdgeDB.Error, fn ->
+        EdgeDB.query!(EdgeDBWrongName, "select 'Hello world'")
+      end
+
+    assert %EdgeDB.Error{type: EdgeDB.InterfaceError} = e
+  end
 end