def get(self, id, pk='id', deleted=False):
        try:
            if pk == 'id':
                id = int(id)
            if deleted:
                spec = {pk: id}
            else:
                spec = {pk: id, 'data': {'$exists': 1}}
            fields = {'_id': 0}
            row = self.db.docs.find_one(spec, fields)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return Document(**row)
        raise NotFoundError('%s %s not found' % (pk, id))
def test_convert_html_in_suggestion_change(self):
        html_content = (
            '<p>Value</p><oppia-noninteractive-math raw_latex-with-value="&a'
            'mp;quot;+,-,-,+&amp;quot;"></oppia-noninteractive-math>')
        expected_html_content = (
            '<p>Value</p><oppia-noninteractive-math math_content-with-value='
            '"{&amp;quot;raw_latex&amp;quot;: &amp;quot;+,-,-,+&amp;quot;, &'
            'amp;quot;svg_filename&amp;quot;: &amp;quot;&amp;quot;}"></oppia'
            '-noninteractive-math>')

        change = {
            'cmd': exp_domain.CMD_EDIT_STATE_PROPERTY,
            'property_name': exp_domain.STATE_PROPERTY_CONTENT,
            'state_name': 'Introduction',
            'new_value': {
                'content_id': 'content',
                'html': '<p>suggestion</p>'
            },
            'old_value': {
                'content_id': 'content',
                'html': html_content
            }
        }
        suggestion = suggestion_registry.SuggestionEditStateContent(
            self.suggestion_dict['suggestion_id'],
            self.suggestion_dict['target_id'],
            self.suggestion_dict['target_version_at_submission'],
            self.suggestion_dict['status'], self.author_id,
            self.reviewer_id, change,
            self.suggestion_dict['score_category'],
            self.suggestion_dict['language_code'], False, self.fake_date)

        suggestion.convert_html_in_suggestion_change(
            html_validation_service.
            add_math_content_to_math_rte_components)
        self.assertEqual(
            suggestion.change.old_value['html'], expected_html_content)