✨ Add support to editable vector joins (1:1 relations) (#599)

* Add 'hasCustomPrefix' property to vectorjoin.

* Add 'editable' property, so serialization of vector join.

* Add property `vectorjoin_id` to REST API /vector/api/config/.

* Fix test.

* Add 'prefix' and convert 'editable' to boolean type.

* Typo.

* Fix 'editable' property for fields in QGIS join.

* Set 'editable' to False if join field is a Pk.

* Fix test editing fi QGIS Join

* For documentation.

* ✨ Client:
   core: g3w-suite/g3w-client#483
   editing: g3w-suite/g3w-client-plugin-editing#52

* ✨ Client:
    client:  - g3w-suite/g3w-client#483
             - g3w-suite/g3w-client#159
    editing: - g3w-suite/g3w-client-plugin-editing#52
             - g3w-suite/g3w-client-plugin-editing#53

* ✨ Client:
    client:  - g3w-suite/g3w-client#483
             - g3w-suite/g3w-client#159
    editing: - g3w-suite/g3w-client-plugin-editing#52
             - g3w-suite/g3w-client-plugin-editing#53

* ✨ Client:
    editing: - g3w-suite/g3w-client-plugin-editing@96c9b40
    editing: - g3w-suite/g3w-client-plugin-editing@16f4c9f
    editing: - g3w-suite/g3w-client-plugin-editing@b7a6bb7

* ✨ Client:
    g3w-client: - g3w-suite/g3w-client@5b2e3fa

* ✨ Client:
    g3w-client-plugin-editing: -g3w-suite/g3w-client-plugin-editing@cd65314

* ✨ Client:
    g3w-client:g3w-suite/g3w-client@f557542
    g3w-client-plugin-editing: g3w-suite/g3w-client-plugin-editing@8aef6a4

---------

Co-authored-by: wlorenzetti <[email protected]>
Co-authored-by: volterra79 <[email protected]>

g3w-admin/core/utils/structure.py

@@ -96,7 +96,8 @@
 
 
 def editingFormField(fieldName, type=FIELD_TYPE_STRING, editable=True, required=False, validate=None,
-                     fieldLabel=None, inputType=None, values=None, default_clause='', unique=False, expression='', pk=False, ** kwargs):
+                     fieldLabel=None, inputType=None, values=None, default_clause='', unique=False, expression='',
+                     pk=False, ** kwargs):
     """
     Build editing form field for client.
     """
@@ -140,7 +141,7 @@ def editingFormField(fieldName, type=FIELD_TYPE_STRING, editable=True, required=
 
 def mapLayerAttributes(layer, formField=False, **kwargs):
     """
-    Map database columns data from layer by type for client editing
+    Map database columns data from layer by type for client
     """
 
     mappingData = FIELD_TYPES_MAPPING
@@ -222,6 +223,22 @@ def mapLayerAttributesFromQgisLayer(qgis_layer, **kwargs):
 
     pk_attributes = qgis_layer.primaryKeyAttributes()
 
+    # Get available Join's fields
+    join_fields = {}
+    for order, join in enumerate(qgis_layer.vectorJoins()):
+        join_id = f'{qgis_layer.id()}_vectorjoin_{order}'
+        joinlayer_pk_attributes = join.joinLayer().primaryKeyAttributes()
+        for i, f in enumerate(join.joinLayer().fields()):
+            editable = join.isEditable()
+
+            # Check if referencing field is PK
+            if i in joinlayer_pk_attributes:
+                editable = False
+            join_fields[join.prefixedFieldName(f)] = {
+                'editable': editable,
+                'join_id': join_id}
+
+
     # Determine if we are using an old and bugged version of QGIS
     IS_QGIS_3_10 = Qgis.QGIS_VERSION.startswith('3.10')
 
@@ -282,8 +299,6 @@ def mapLayerAttributesFromQgisLayer(qgis_layer, **kwargs):
                 else:
                     is_pk = (field_index in pk_attributes)
 
-                #
-
                 toRes[field.name()] = editingFormField(
                     field.name(),
                     required=not_null,
@@ -342,6 +357,14 @@ def mapLayerAttributesFromQgisLayer(qgis_layer, **kwargs):
                         toRes[field.name()]['input']['options']['default_expression']['apply_on_update'] = True \
                             if field.defaultValueDefinition().applyOnUpdate() else False
 
+                # Check for Join's field.
+                # About joins in QGIS control the join settings for editing.
+                try:
+                    toRes[field.name()]['vectorjoin_id'] = join_fields[field.name()]['join_id']
+                    toRes[field.name()]["editable"] = join_fields[field.name()]["editable"]
+                except:
+                    pass
+
         field_index += 1
 
     return toRes