Fix Mismatched labels and translations error for forms using multiple languages and select_one_from_file or select_multiple_from_file

src/formpack/constants.py

@@ -51,6 +51,14 @@
     'hxl': '',
 }
 
+# Which columns can contain media filenames? Do not confuse this with question
+# types that can collect media! From https://xlsform.org/en/#media:
+#     You can include questions in your form that display images or that play
+#     video or audio files
+#     …
+#     Media is translatable in the same way as labels and hints…
+MEDIA_COLUMN_NAMES = ('audio', 'image', 'video')
+
 # Export Settings
 EXPORT_SETTING_FIELDS = 'fields'
 EXPORT_SETTING_FIELDS_FROM_ALL_VERSIONS = 'fields_from_all_versions'

src/formpack/utils/bugfix.py

@@ -0,0 +1,78 @@
+# coding: utf-8
+
+from copy import deepcopy
+
+from ..constants import UNTRANSLATED
+
+
+def repair_file_column_content_in_place(content) -> bool:
+    """
+    #321 introduced a bug where the `file` column gets renamed to `media::file`
+    and treated as a translatable column (see #322). This function repairs that
+    damage.
+
+    This function is intended to be run by KPI, which should it to correct
+    `Asset` and `AssetVersion` content.
+
+    Returns `True` if any change was made
+    """
+
+    # Store updates and apply them to `content` only of all conditions are met
+    updates = {}
+
+    try:
+        for key in 'translated', 'translations', 'survey':
+            updates[key] = deepcopy(content[key])
+    except KeyError:
+        # Do not proceed if content is incomplete
+        return False
+
+    try:
+        updates['translated'].remove('media::file')
+    except ValueError:
+        # The invalid column `media::file` inside `translated` is a hallmark of
+        # the problem this method is intended to fix. Do not proceed if it was
+        # not found
+        return False
+
+    max_label_list_length = 0
+    any_row_fixed = False
+    for row in updates['survey']:
+        max_label_list_length = max(
+            max_label_list_length, len(row.get('label', []))
+        )
+        bad_file_col = row.get('media::file')
+        if not bad_file_col:
+            continue
+        if not isinstance(bad_file_col, list):
+            # All problems of our own making (#322) will result in
+            # `media::file` being a list (or array when JSON)
+            continue
+        for val in bad_file_col:
+            if val is not None:
+                row['file'] = val
+                del row['media::file']
+                any_row_fixed = True
+                break
+    if not any_row_fixed:
+        return False
+
+    # Multi-language forms need an additional fix to remove a superfluous null
+    # translation added by the bogus `media::file` column
+    if len(updates['translations']) > max_label_list_length:
+        labels_translations_mismatch = True
+        if len(updates['translations']) == max_label_list_length + 1:
+            try:
+                updates['translations'].remove(UNTRANSLATED)
+            except ValueError:
+                pass
+            else:
+                labels_translations_mismatch = False  # Fixed it!
+        if labels_translations_mismatch:
+            # This form has uncorrected problems. Bail out instead of modifying
+            # it at all
+            return False
+
+    # Success! Apply updates to the original content
+    content.update(updates)
+    return True

src/formpack/utils/expand_content.py

@@ -18,8 +18,9 @@
 
 from .array_to_xpath import EXPANDABLE_FIELD_TYPES
 from .iterator import get_first_occurrence
-from .replace_aliases import MEDIA_TYPES, META_TYPES, selects
+from .replace_aliases import META_TYPES, selects
 from ..constants import (
+    MEDIA_COLUMN_NAMES,
     OR_OTHER_COLUMN,
     TAG_COLUMNS_AND_SEPARATORS,
     UNTRANSLATED,
@@ -186,7 +187,7 @@ def _get_known_translated_cols(translated_cols: List[str]) -> List[str]:
 
     _translated_cols = []
     for col in translated_cols:
-        if col in MEDIA_TYPES:
+        if col in MEDIA_COLUMN_NAMES:
             col = f'media::{col}'
         _translated_cols.append(col)
 
@@ -207,7 +208,7 @@ def _get_special_survey_cols(
         'hint::English',
     For more examples, see tests.
     """
-    RE_MEDIA_TYPES = '|'.join(MEDIA_TYPES)
+    RE_MEDIA_COLUMN_NAMES = '|'.join(MEDIA_COLUMN_NAMES)
 
     uniq_cols = OrderedDict()
     special = OrderedDict()
@@ -238,14 +239,14 @@ def _mark_special(**kwargs: str) -> None:
                 column=column_name,
                 translation=UNTRANSLATED,
             )
-        if ':' not in column_name and column_name not in MEDIA_TYPES:
+        if ':' not in column_name and column_name not in MEDIA_COLUMN_NAMES:
             continue
         if column_name.startswith('bind:'):
             continue
         if column_name.startswith('body:'):
             continue
         mtch = re.match(
-            rf'^(media\s*::?\s*)?({RE_MEDIA_TYPES})\s*::?\s*([^:]+)$',
+            rf'^(media\s*::?\s*)?({RE_MEDIA_COLUMN_NAMES})\s*::?\s*([^:]+)$',
             column_name,
         )
         if mtch:
@@ -260,7 +261,9 @@ def _mark_special(**kwargs: str) -> None:
                 translation=translation,
             )
             continue
-        mtch = re.match(rf'^(media\s*::?\s*)?({RE_MEDIA_TYPES})$', column_name)
+        mtch = re.match(
+            rf'^(media\s*::?\s*)?({RE_MEDIA_COLUMN_NAMES})$', column_name
+        )
         if mtch:
             matched = mtch.groups()
             media_type = matched[1]

tests/test_bugfix.py

@@ -0,0 +1,32 @@
+# coding: utf-8
+
+from formpack.utils.bugfix import repair_file_column_content_in_place
+
+
+def test_repair_file_column():
+    content = {
+        'schema': '1',
+        'settings': {},
+        'survey': [
+            {
+                'label': [
+                    "Введіть ім'я співробітника:",
+                    "Enter interviewer's name",
+                ],
+                'name': 'interviewer_name_text',
+                'type': 'text',
+            },
+            {
+                'label': ['Область', 'Oblast'],
+                'media::file': [None, None, 'oblast.csv'],
+                'name': 'oblast',
+                'type': 'select_one_from_file',
+            },
+        ],
+        'translated': ['label', 'media::file'],
+        'translations': ['Ukrainian', 'English', None],
+    }
+    assert repair_file_column_content_in_place(content)
+    assert content['survey'][1]['file'] == 'oblast.csv'
+    assert content['translated'] == ['label']
+    assert content['translations'] == ['Ukrainian', 'English']

tests/test_exports.py

@@ -376,6 +376,45 @@ def test_translations_labels_mismatch(self):
         with self.assertRaises(TranslationError):
             FormPack(schemas, title)
 
+    def test_translations_with_select_multiple_from_file(self):
+        """
+        Make sure that exports do not crash if `select_multiple_from_file` is
+        used in a multi-language form. See #322
+        """
+
+        title, schemas, submissions = restaurant_profile
+
+        # Add a `select_multiple_from_file` question to existing `rpV4` schema
+        assert schemas[-1]['version'] == 'rpV4'
+        schemas[-1]['content']['survey'].append(
+            {
+                'type': 'select_multiple_from_file suppliers.csv',
+                'name': 'suppliers',
+                'label::english': 'suppliers',
+                'label::french': 'fournisseurs',
+            }
+        )
+        fp = FormPack(schemas[-1:], title)
+
+        # Expect that a `file` column has been added; see
+        # `test_expand_content.test_expand_select_x_from_file()`
+        assert (
+            fp.versions['rpV4'].schema['content']['survey'][-1]['file']
+            == 'suppliers.csv'
+        )
+
+        # Feed this schema with `file` back into formpack again
+        fp = FormPack([fp.versions['rpV4'].schema], title)
+
+        # At this point, issue #322 would have already caused
+        # `TranslationError: Mismatched labels and translations`, but perform a
+        # simple export anyway, adding a response for `suppliers`
+        submissions[-1]['suppliers'] = 'SFG Ocsys'
+        export = fp.export(versions=fp.versions)
+        actual_dict = export.to_dict(submissions)
+        assert actual_dict['Restaurant profile']['fields'][-1] == 'suppliers'
+        assert actual_dict['Restaurant profile']['data'][-1][-1] == 'SFG Ocsys'
+
     def test_simple_nested_grouped_repeatable(self):
         title, schemas, submissions = build_fixture(
             'simple_nested_grouped_repeatable'