[Fixes GeoNode#8690] first implementation for dynamic filtering

geonode/api/resourcebase_api.py

@@ -169,7 +169,7 @@ def build_filters(self, filters=None, ignore_bad_filters=False, **kwargs):
             orm_filters.update({'polymorphic_ctype__model__in': [filt.lower() for filt in filters.getlist('app_type__in')]})
         if 'extent' in filters:
             orm_filters.update({'extent': filters['extent']})
-        _metadata = {f"metadata__{_k}": _v for _k, _v in filters.items() if _k.startswith('metadata')}
+        _metadata = {f"metadata__{_k}": _v for _k, _v in filters.items() if _k.startswith('metadata__')}
         if _metadata:
             orm_filters.update({"metadata_filters": _metadata})
         orm_filters['f_method'] = filters['f_method'] if 'f_method' in filters else 'and'

geonode/base/templatetags/base_tags.py

@@ -17,12 +17,14 @@
 #
 #########################################################################
 
+from enum import Enum
 import logging
 
 from django import template
 from django.db.models import Q
 from django.conf import settings
 from django.db.models import Count
+from django.forms import model_to_dict
 from django.utils.translation import ugettext
 from django.contrib.auth import get_user_model
 from django.utils.translation import ugettext_lazy as _
@@ -31,7 +33,7 @@
 from pinax.ratings.models import Rating
 from guardian.shortcuts import get_objects_for_user
 
-from geonode.base.models import ResourceBase
+from geonode.base.models import ExtraMetadata, ResourceBase
 from geonode.base.bbox_utils import filter_bbox
 from geonode.layers.models import Layer
 from geonode.maps.models import Map
@@ -55,6 +57,12 @@
     'wms': _('WMS Cascade Layer')
 }
 
+class FACET_TO_RESOURCE_TYPE(Enum):
+    layers = 'layer'
+    maps = 'map'
+    documents = 'document'
+    geoapps = 'geoapp'
+
 
 @register.filter(name='template_trans')
 def template_trans(text):
@@ -495,3 +503,34 @@ def get_layer_count_by_services(service_id, user):
         queryset=Layer.objects.filter(remote_service=service_id),
         user=user
     ).count()
+
+
+@register.simple_tag(takes_context=True)
+def dynamic_metadata_filters(context):
+
+    facet_type = context.get('facet_type', 'all')
+
+    metadata_available = ExtraMetadata.objects.all()
+
+    if facet_type != 'all':
+        resource_type = getattr(FACET_TO_RESOURCE_TYPE, facet_type).value
+        metadata_available = metadata_available\
+            .filter(resource__polymorphic_ctype__model=resource_type)
+
+    if not metadata_available.exists():
+        return []
+
+    categories = metadata_available.values_list('metadata__category', flat=True).distinct()
+
+    output = {}
+
+    for _cat in categories:
+        output[_cat] = _get_filter_by_category(_cat, metadata_available)
+
+    return output
+
+def _get_filter_by_category(category, metadata_available):
+    metadata_for_category = metadata_available.filter(
+        metadata__category=category
+    )        
+    return [_el.metadata for _el in metadata_for_category]

geonode/maps/tests.py

@@ -528,7 +528,6 @@ def test_that_non_admin_user_can_create_edit_keyword_when_freetext_keywords_read
         test_map.refresh_from_db()
         self.assertEqual("map", test_map.title)
 
-
     @patch('geonode.thumbs.thumbnails.create_thumbnail')
     def test_map_metadata(self, thumbnail_mock):
         """Test that map metadata can be properly rendered

geonode/templates/search/_search_content.html

@@ -48,6 +48,7 @@
             {% if SEARCH_FILTERS.EXTENT_ENABLED %}
               {% include "search/_extent_filter.html" %}
             {% endif %}
+            {% include "search/_dynamic_metadata_filter.html" %}
           {% endblock search_facet_lists %}
         </div>
       {% endif %}