Honour ValueRelation AllowMulti option

Author: manisandro

src/config_generator/dnd_form_generator.py

@@ -193,6 +193,7 @@ def __create_editor_widget(self, maplayer, projectname, layername, project, fiel
             key = editWidget.find("config/Option/Option[@name='Key']").get('value')
             value = editWidget.find("config/Option/Option[@name='Value']").get('value')
             layer = editWidget.find("config/Option/Option[@name='LayerName']").get('value')
+            allowMulti = editWidget.find("config/Option/Option[@name='AllowMulti']").get('value')
             # Lookup shortname
             for maplayer in project.findall('.//maplayer'):
                 layernameEl = maplayer.find('layername')
@@ -204,6 +205,7 @@ def __create_editor_widget(self, maplayer, projectname, layername, project, fiel
             widget.set("name", "kvrel__{field}__{kvtable}__{keyfield}__{valuefield}".format(
                 field=prefix + field, kvtable=layer, keyfield=key, valuefield=value
             ))
+            widget.set("allowMulti", allowMulti)
             return widget
         elif editWidget.get("type") == "ExternalResource":
             widget.set("class", "QLineEdit")

src/config_generator/qgs_reader.py

@@ -544,11 +544,14 @@ def __edit_widget_constraints(self, maplayer, field, keyvaltables):
                         "config/Option/Option[@name='LayerName']").get('value')
             layerSource = edit_widget.find(
                         "config/Option/Option[@name='LayerSource']").get('value')
+            allowMulti = edit_widget.find(
+                        "config/Option/Option[@name='AllowMulti']").get('value') == "true"
 
             # Lookup shortname
             layerName = self.__lookup_short_name(layerName)
 
             constraints['keyvalrel'] = self.map_prefix + "." + layerName + ":" + key + ":" + value
+            constraints['allowMulti'] = allowMulti
             keyvaltables[self.map_prefix + "." + layerName] = self.__table_metadata(layerSource)
             keyvaltables[self.map_prefix + "." + layerName]['qgs_name'] = self.map_prefix
             keyvaltables[self.map_prefix + "." + layerName]['layername'] = layerName