fix: handle big-image as valid media type to prevent translation mismatches in exports

src/formpack/constants.py

@@ -57,7 +57,7 @@
 #     video or audio files
 #     …
 #     Media is translatable in the same way as labels and hints…
-MEDIA_COLUMN_NAMES = ('audio', 'image', 'video')
+MEDIA_COLUMN_NAMES = ('audio', 'image', 'video', 'big-image')
 
 # Export Settings
 EXPORT_SETTING_FIELDS = 'fields'

tests/test_big_image_media_handling.py

@@ -0,0 +1,71 @@
+import pytest
+
+from formpack import FormPack
+from formpack.errors import TranslationError
+from formpack.utils.expand_content import expand_content
+
+
+def test_big_image_with_other_media_types_works_correctly():
+    content = {
+        'survey': [
+            {
+                'type': 'select_one',
+                'name': 'q_multi_media',
+                'label': 'Question with multiple media',
+                'media::image': 'small.png',
+                'big-image': 'large.png',
+                'select_from_list_name': 'opts',
+            }
+        ],
+        'choices': [
+            {'list_name': 'opts', 'name': 'a', 'label': 'Option A'},
+        ],
+        'translations': [None],
+    }
+
+    expand_content(content, in_place=True)
+
+    # All media should be in translated
+    translated = content.get('translated', [])
+    assert 'media::image' in translated
+    assert 'media::big-image' in translated
+
+    # Only NONE should be in translations
+    assert 'big-image' not in content['translations']
+    assert 'image' not in content['translations']
+
+    # FormPack should process without errors
+    fp = FormPack([{'content': content, 'version': 1}], 'Test')
+    assert len(fp.versions) == 1
+
+
+def test_formpack_raises_error_when_big_image_not_in_media_names(monkeypatch):
+    """
+    Test that FormPack raises an error when `big-image` is used
+    but not included in media names
+    """
+    content = {
+        'survey': [
+            {
+                'type': 'select_one',
+                'name': 'q_with_big_image',
+                'label': 'Question with big image',
+                'big-image': 'large.png',
+                'select_from_list_name': 'opts',
+            }
+        ],
+        'choices': [
+            {'list_name': 'opts', 'name': 'a', 'label': 'Option A'},
+        ],
+        'translations': [None],
+    }
+
+    # Patch MEDIA_COLUMN_NAMES to exclude 'big-image'
+    monkeypatch.setattr(
+        'formpack.utils.expand_content.MEDIA_COLUMN_NAMES',
+        ('image', 'audio', 'video')
+    )
+    expand_content(content, in_place=True)
+
+    with pytest.raises(TranslationError):
+        FormPack([{'content': content, 'version': 1}], 'Test')