blocks: add support for post conditions (#71778)

wcs/blocks.py

@@ -24,7 +24,7 @@ from contextlib import contextmanager
 from quixote import get_publisher, get_request, get_response
 from quixote.html import htmltag, htmltext
 
-from . import data_sources, fields
+from . import conditions, data_sources, fields
 from .categories import BlockCategory
 from .formdata import FormData
 from .qommon import _, misc
@@ -435,6 +435,21 @@ class BlockSubWidget(CompositeWidget):
                 all_lists = False
             if widget_value.get(widget.field.id) not in empty_values:
                 empty = False
+
+        if not empty and self.block.post_conditions:
+            error_messages = []
+            with self.block.visibility_context(value, self.index):
+                for i, post_condition in enumerate(self.block.post_conditions):
+                    condition = post_condition.get('condition')
+                    error_message = post_condition.get('error_message')
+                    try:
+                        if not conditions.Condition(condition, record_errors=False).evaluate():
+                            error_messages.append(error_message)
+                    except RuntimeError:
+                        error_messages.append(error_message)
+            if error_messages:
+                self.set_error(' '.join(error_messages))
+
         if empty and not all_lists and not get_publisher().keep_all_block_rows_mode:
             value = None
             for widget in self.get_widgets():  # reset "required" errors
@@ -528,6 +543,10 @@ class BlockWidget(WidgetList):
             self._parse(request)
             if self.required and self.value is None:
                 self.set_error(_(self.REQUIRED_ERROR))
+            for widget in self.widgets:
+                # do not mark individual rows as required
+                if widget.error == self.REQUIRED_ERROR:
+                    widget.clear_error()
         return self.value
 
     def add_media(self):

wcs/qommon/templates/qommon/forms/widgets/block_sub.html

@@ -6,6 +6,7 @@
 {% endblock %}
 
 {% block widget-content %}
+  {% if not widget.readonly and widget.error %}<div class="error"><p>{{ widget.error }}</p></div>{% endif %}
   {% for subwidget in widget.get_widgets %}
     {% if widget.readonly and not subwidget.field.include_in_validation_page %}<div style="display: none">{% endif %}
     {{ subwidget.render|safe }}