Add support for N-Dimensional Arrays

Fixes #288

Author: jbeard4

graphene_sqlalchemy/converter.py

@@ -239,11 +239,15 @@ def convert_scalar_list_to_list(type, column, registry=None):
     return List(String)
 
 
+def init_array_list_recursive(inner_type, n):
+    return inner_type if n == 0 else List(init_array_list_recursive(inner_type, n-1))
+
+
 @convert_sqlalchemy_type.register(types.ARRAY)
 @convert_sqlalchemy_type.register(postgresql.ARRAY)
 def convert_array_to_list(_type, column, registry=None):
     inner_type = convert_sqlalchemy_type(column.type.item_type, column)
-    return List(inner_type)
+    return List(init_array_list_recursive(inner_type, (column.type.dimensions or 1) - 1))
 
 
 @convert_sqlalchemy_type.register(postgresql.HSTORE)

graphene_sqlalchemy/tests/test_converter.py

@@ -324,6 +324,21 @@ def test_should_array_convert():
     assert field.type.of_type == graphene.Int
 
 
+def test_should_2d_array_convert():
+    field = get_field(types.ARRAY(types.Integer, dimensions=2))
+    assert isinstance(field.type, graphene.List)
+    assert isinstance(field.type.of_type, graphene.List)
+    assert field.type.of_type.of_type == graphene.Int
+
+
+def test_should_3d_array_convert():
+    field = get_field(types.ARRAY(types.Integer, dimensions=3))
+    assert isinstance(field.type, graphene.List)
+    assert isinstance(field.type.of_type, graphene.List)
+    assert isinstance(field.type.of_type.of_type, graphene.List)
+    assert field.type.of_type.of_type.of_type == graphene.Int
+
+
 def test_should_postgresql_json_convert():
     assert get_field(postgresql.JSON()).type == graphene.JSONString