Fix #246 -- Add support for deepcopy

Author: vchrisb

Diff for: stdimage/models.py

@@ -144,6 +144,25 @@ def delete_variations(self):
             variation_name = self.get_variation_name(self.name, variation)
             self.storage.delete(variation_name)
 
+    def __getstate__(self):
+        state = super().__getstate__()
+        state["variations"] = {}
+        for variation_name in self.field.variations:
+            variation = getattr(self, variation_name)
+            variation_state = variation.__getstate__()
+            state["variations"][variation_name] = variation_state
+        return state
+
+    def __setstate__(self, state):
+        variations = state["variations"]
+        state.pop("variations")
+        super().__setstate__(state)
+        for key, value in variations.items():
+            cls = ImageFieldFile
+            field = cls.__new__(cls)
+            setattr(self, key, field)
+            getattr(self, key).__setstate__(value)
+
 
 class StdImageField(ImageField):
     """

Diff for: tests/test_models.py

@@ -1,13 +1,17 @@
 import io
 import os
 import time
+from copy import deepcopy
 
 import pytest
 from django.conf import settings
 from django.core.files.storage import default_storage
 from django.core.files.uploadedfile import SimpleUploadedFile
+from django.db.models.fields.files import ImageFieldFile
 from PIL import Image
 
+from stdimage.models import StdImageFieldFile
+
 from . import models
 from .models import (
     AdminDeleteModel,
@@ -170,6 +174,47 @@ def test_defer(self, db, django_assert_num_queries):
             deferred.image
         assert instance.image.thumbnail == deferred.image.thumbnail
 
+    @pytest.mark.django_db
+    def test_variations_deepcopy(self):
+        """Tests test_variations() with a deep copied object"""
+        instance_original = ResizeModel.objects.create(
+            image=self.fixtures["600x400.jpg"]
+        )
+        instance = deepcopy(instance_original)
+        assert isinstance(instance.image, StdImageFieldFile)
+
+        assert hasattr(instance.image, "thumbnail")
+        assert hasattr(instance.image, "medium")
+
+        assert isinstance(instance.image.thumbnail, ImageFieldFile)
+        assert isinstance(instance.image.medium, ImageFieldFile)
+
+        source_file = self.fixtures["600x400.jpg"]
+
+        assert os.path.exists(os.path.join(IMG_DIR, "600x400.jpg"))
+        assert instance.image.width == 600
+        assert instance.image.height == 400
+        path = os.path.join(IMG_DIR, "600x400.jpg")
+
+        with open(path, "rb") as f:
+            source_file.seek(0)
+            assert source_file.read() == f.read()
+
+        path = os.path.join(IMG_DIR, "600x400.medium.jpg")
+        assert os.path.exists(path)
+        assert instance.image.medium.width == 400
+        assert instance.image.medium.height <= 400
+        with open(os.path.join(IMG_DIR, "600x400.medium.jpg"), "rb") as f:
+            source_file.seek(0)
+            assert source_file.read() != f.read()
+
+        assert os.path.exists(os.path.join(IMG_DIR, "600x400.thumbnail.jpg"))
+        assert instance.image.thumbnail.width == 100
+        assert instance.image.thumbnail.height <= 75
+        with open(os.path.join(IMG_DIR, "600x400.thumbnail.jpg"), "rb") as f:
+            source_file.seek(0)
+            assert source_file.read() != f.read()
+
 
 class TestUtils(TestStdImage):
     """Tests Utils"""