Table filters

* adds table filtering for InterventionTable
* adds default ordering
* moves user-access filtering from view to InterventionTableFiler
* adds generic render_icn method for BaseTable (for usage with fontawesome5)
* adds translations
* improves table.html template

intervention/filters.py

@@ -0,0 +1,113 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 22.07.21
+
+"""
+import django_filters
+from django import forms
+from django.contrib.auth.models import User
+from django.db.models import QuerySet, Q
+
+from django.utils.translation import gettext_lazy as _
+from intervention.models import Intervention
+
+
+class InterventionTableFilter(django_filters.FilterSet):
+    q = django_filters.Filter(
+        method='_filter_by_keyword',
+        widget=forms.HiddenInput(),  # use search bar in template, we only need the filter logic in here!
+    )
+    sa = django_filters.BooleanFilter(
+        method='_filter_show_all',
+        label=_("Show all"),
+        label_suffix=_(""),
+        widget=forms.CheckboxInput()
+    )
+    sr = django_filters.BooleanFilter(
+        method='_filter_show_recorded',
+        label=_("Show recorded"),
+        label_suffix=_(""),
+        widget=forms.CheckboxInput()
+    )
+    # Gemarkung ##ToDo
+    g = django_filters.CharFilter(
+        field_name="name",
+        lookup_expr="icontains",
+        label=_(""),
+        label_suffix=_(""),
+        widget=forms.TextInput(
+            attrs={
+                "placeholder": _("District"),
+                "title": _("Search for district")
+            }
+        ),
+    )
+    # Kreis
+    ## ToDo
+    # Flur
+    ## ToDo
+    # Zähler
+    ## ToDo
+    # Nenner
+    ## ToDo
+
+    class Meta:
+        model = Intervention
+        fields = []
+
+    def __init__(self, user: User, *args, **kwargs):
+        self.user = user
+        super().__init__(*args, **kwargs)
+
+    def _filter_by_keyword(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of search bar input
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        # build filter expression
+        q = Q(title__icontains=value) | Q(identifier__icontains=value)
+        return queryset.filter(q)
+
+    def _filter_show_all(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of 'show_all' setting
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        if not value:
+            return queryset.filter(
+                users__in=[self.user],  # requesting user has access
+            )
+        else:
+            return queryset
+
+    def _filter_show_recorded(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of 'show_recorded' setting
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        if not value:
+            return queryset.filter(
+                recorded_on=None,
+            )
+        else:
+            return queryset