|
| 1 | +from __future__ import annotations |
| 2 | + |
| 3 | +from datetime import datetime, timedelta |
| 4 | +from typing import TYPE_CHECKING |
| 5 | + |
| 6 | +from django.utils import timezone |
| 7 | +from django_filters import ( |
| 8 | + BaseInFilter, |
| 9 | + BooleanFilter, |
| 10 | + CharFilter, |
| 11 | + DateTimeFromToRangeFilter, |
| 12 | + FilterSet, |
| 13 | + MultipleChoiceFilter, |
| 14 | + NumberFilter, |
| 15 | + OrderingFilter, |
| 16 | +) |
| 17 | + |
| 18 | +if TYPE_CHECKING: |
| 19 | + from collections.abc import Iterable |
| 20 | + |
| 21 | + |
| 22 | +# https://django-filter.readthedocs.io/en/stable/ref/filters.html#baseinfilter |
| 23 | +class NumberInFilter(BaseInFilter, NumberFilter): |
| 24 | + |
| 25 | + """Support for searches like `id__in`.""" |
| 26 | + |
| 27 | + |
| 28 | +# https://django-filter.readthedocs.io/en/stable/ref/filters.html#baseinfilter |
| 29 | +class CharFieldInFilter(BaseInFilter, CharFilter): |
| 30 | + |
| 31 | + """Support for searches like `id__in`.""" |
| 32 | + |
| 33 | + def filter(self, qs, value): |
| 34 | + if not value: |
| 35 | + return qs |
| 36 | + if isinstance(value, str): |
| 37 | + value = [v.strip() for v in value.split(",") if v.strip()] |
| 38 | + return super().filter(qs, value) |
| 39 | + |
| 40 | + |
| 41 | +class StaticMethodFilters(FilterSet): |
| 42 | + |
| 43 | + """Static methods to make setting new filters easier.""" |
| 44 | + |
| 45 | + @staticmethod |
| 46 | + def set_class_variables(context: dict, class_vars: dict) -> None: |
| 47 | + """Set the contents of `class_vars` into the supplied context.""" |
| 48 | + context.update(class_vars) |
| 49 | + |
| 50 | + @staticmethod |
| 51 | + def create_char_filters( |
| 52 | + field_name: str, |
| 53 | + help_text_header: str, |
| 54 | + context: dict, |
| 55 | + ) -> None: |
| 56 | + """ |
| 57 | + Create all the filters needed for a CharFilter. |
| 58 | +
|
| 59 | + - Exact Match |
| 60 | + - Not Exact Match |
| 61 | + - Contains |
| 62 | + - Not Contains |
| 63 | + - Starts with |
| 64 | + - Ends with |
| 65 | + """ |
| 66 | + return StaticMethodFilters.set_class_variables( |
| 67 | + context, |
| 68 | + { |
| 69 | + f"{field_name}_exact": CharFilter( |
| 70 | + field_name=field_name, |
| 71 | + lookup_expr="iexact", |
| 72 | + help_text=f"{help_text_header}: Exact Match", |
| 73 | + ), |
| 74 | + f"{field_name}_not_exact": CharFilter( |
| 75 | + field_name=field_name, |
| 76 | + lookup_expr="iexact", |
| 77 | + help_text=f"{help_text_header}: Not Exact Match", |
| 78 | + exclude=True, |
| 79 | + ), |
| 80 | + f"{field_name}_contains": CharFilter( |
| 81 | + field_name=field_name, |
| 82 | + lookup_expr="icontains", |
| 83 | + help_text=f"{help_text_header}: Contains", |
| 84 | + ), |
| 85 | + f"{field_name}_not_contains": CharFilter( |
| 86 | + field_name=field_name, |
| 87 | + lookup_expr="icontains", |
| 88 | + help_text=f"{help_text_header}: Not Contains", |
| 89 | + exclude=True, |
| 90 | + ), |
| 91 | + f"{field_name}_starts_with": CharFilter( |
| 92 | + field_name=field_name, |
| 93 | + lookup_expr="istartswith", |
| 94 | + help_text=f"{help_text_header}: Starts With", |
| 95 | + ), |
| 96 | + f"{field_name}_ends_with": CharFilter( |
| 97 | + field_name=field_name, |
| 98 | + lookup_expr="iendswith", |
| 99 | + help_text=f"{help_text_header}: Ends With", |
| 100 | + ), |
| 101 | + f"{field_name}_includes": CharFieldInFilter( |
| 102 | + field_name=field_name, |
| 103 | + lookup_expr="in", |
| 104 | + help_text=f"{help_text_header}: Included in List", |
| 105 | + ), |
| 106 | + f"{field_name}_not_includes": CharFieldInFilter( |
| 107 | + field_name=field_name, |
| 108 | + lookup_expr="in", |
| 109 | + help_text=f"{help_text_header}: Not Included in List", |
| 110 | + exclude=True, |
| 111 | + ), |
| 112 | + }, |
| 113 | + ) |
| 114 | + |
| 115 | + @staticmethod |
| 116 | + def create_integer_filters( |
| 117 | + field_name: str, |
| 118 | + help_text_header: str, |
| 119 | + context: dict, |
| 120 | + ) -> None: |
| 121 | + """ |
| 122 | + Create all the filters needed for an IntegerFilter. |
| 123 | +
|
| 124 | + - Exact Match |
| 125 | + - Not Exact Match |
| 126 | + - Greater Than or Equal to |
| 127 | + - Less Than or Equal to |
| 128 | + - ID included in the list |
| 129 | + - ID Not included in the list |
| 130 | + """ |
| 131 | + return StaticMethodFilters.set_class_variables( |
| 132 | + context, |
| 133 | + { |
| 134 | + f"{field_name}_equals": NumberFilter( |
| 135 | + field_name=field_name, |
| 136 | + lookup_expr="exact", |
| 137 | + help_text=f"{help_text_header}: Equals", |
| 138 | + ), |
| 139 | + f"{field_name}_not_equals": NumberFilter( |
| 140 | + field_name=field_name, |
| 141 | + lookup_expr="exact", |
| 142 | + help_text=f"{help_text_header}: Not Equals", |
| 143 | + exclude=True, |
| 144 | + ), |
| 145 | + f"{field_name}_greater_than_or_equal_to": NumberFilter( |
| 146 | + field_name=field_name, |
| 147 | + lookup_expr="gte", |
| 148 | + help_text=f"{help_text_header}: Greater Than or Equal To", |
| 149 | + ), |
| 150 | + f"{field_name}_less_than_or_equal_to": NumberFilter( |
| 151 | + field_name=field_name, |
| 152 | + lookup_expr="lte", |
| 153 | + help_text=f"{help_text_header}: Less Than or Equal To", |
| 154 | + ), |
| 155 | + f"{field_name}_includes": NumberInFilter( |
| 156 | + field_name=field_name, |
| 157 | + lookup_expr="in", |
| 158 | + help_text=f"{help_text_header}: Included in List", |
| 159 | + ), |
| 160 | + f"{field_name}_not_includes": NumberInFilter( |
| 161 | + field_name=field_name, |
| 162 | + lookup_expr="in", |
| 163 | + help_text=f"{help_text_header}: Not Included in List", |
| 164 | + exclude=True, |
| 165 | + ), |
| 166 | + }, |
| 167 | + ) |
| 168 | + |
| 169 | + @staticmethod |
| 170 | + def create_choice_filters( |
| 171 | + field_name: str, |
| 172 | + help_text_header: str, |
| 173 | + choices: list[tuple[str]], |
| 174 | + context: dict, |
| 175 | + ) -> None: |
| 176 | + """Create a filter for requiring a single choice.""" |
| 177 | + return StaticMethodFilters.set_class_variables( |
| 178 | + context, |
| 179 | + { |
| 180 | + f"{field_name}_equals": MultipleChoiceFilter( |
| 181 | + field_name=field_name, |
| 182 | + choices=choices, |
| 183 | + help_text=f"{help_text_header}: Choice Filter", |
| 184 | + ), |
| 185 | + }, |
| 186 | + ) |
| 187 | + |
| 188 | + @staticmethod |
| 189 | + def create_datetime_filters( |
| 190 | + field_name: str, |
| 191 | + help_text_header: str, |
| 192 | + context: dict, |
| 193 | + ) -> None: |
| 194 | + """Create a filter for setting datetime filters.""" |
| 195 | + return StaticMethodFilters.set_class_variables( |
| 196 | + context, |
| 197 | + { |
| 198 | + field_name: DateTimeFromToRangeFilter( |
| 199 | + field_name=field_name, |
| 200 | + help_text=f"{help_text_header}: DateTime Range Filter", |
| 201 | + ), |
| 202 | + }, |
| 203 | + ) |
| 204 | + |
| 205 | + @staticmethod |
| 206 | + def create_boolean_filters( |
| 207 | + field_name: str, |
| 208 | + help_text_header: str, |
| 209 | + context: dict, |
| 210 | + ) -> None: |
| 211 | + """Create a filter for boolean filters.""" |
| 212 | + return StaticMethodFilters.set_class_variables( |
| 213 | + context, |
| 214 | + { |
| 215 | + field_name: BooleanFilter( |
| 216 | + field_name=field_name, |
| 217 | + help_text=f"{help_text_header}: True/False", |
| 218 | + ), |
| 219 | + }, |
| 220 | + ) |
| 221 | + |
| 222 | + @staticmethod |
| 223 | + def create_ordering_filters( |
| 224 | + context: dict, |
| 225 | + field_names: Iterable[str], |
| 226 | + ) -> None: |
| 227 | + """Create an ordering filter for all fields in the dict.""" |
| 228 | + return StaticMethodFilters.set_class_variables( |
| 229 | + context, |
| 230 | + {"ordering": OrderingFilter(fields=[(field_name, field_name) for field_name in field_names])}, |
| 231 | + ) |
| 232 | + |
| 233 | + |
| 234 | +class CommonFilters(StaticMethodFilters): |
| 235 | + |
| 236 | + """Helpers for FilterSets to reduce copy/past code.""" |
| 237 | + |
| 238 | + StaticMethodFilters.create_integer_filters("id", "ID", locals()) |
| 239 | + StaticMethodFilters.create_datetime_filters("created_at", "Created At", locals()) |
| 240 | + StaticMethodFilters.create_datetime_filters("updated_at", "Updated At", locals()) |
| 241 | + |
| 242 | + |
| 243 | +def filter_timestamp(queryset, name, value): |
| 244 | + try: |
| 245 | + date = datetime.strptime(value, "%Y-%m-%d") |
| 246 | + except ValueError: |
| 247 | + return queryset |
| 248 | + |
| 249 | + start_datetime = timezone.make_aware(datetime.combine(date, datetime.min.time())) |
| 250 | + end_datetime = timezone.make_aware(datetime.combine(date + timedelta(days=1), datetime.min.time())) |
| 251 | + |
| 252 | + return queryset.filter(**{f"{name}__gte": start_datetime, f"{name}__lt": end_datetime}) |
| 253 | + |
| 254 | + |
| 255 | +def csv_filter(queryset, name, value): |
| 256 | + return queryset.filter(**{f"{name}__in": value.split(",")}) |
| 257 | + |
| 258 | + |
| 259 | +class CustomOrderingFilter(OrderingFilter): |
| 260 | + def __init__(self, *args, **kwargs): |
| 261 | + self.reverse_fields = kwargs.pop("reverse_fields", []) |
| 262 | + super().__init__(*args, **kwargs) |
| 263 | + |
| 264 | + def filter(self, qs, value): |
| 265 | + if value in {None, ""}: |
| 266 | + return qs |
| 267 | + |
| 268 | + ordering = [] |
| 269 | + |
| 270 | + for param in value: |
| 271 | + stripped_param = param.strip() |
| 272 | + raw_field = stripped_param.lstrip("-") |
| 273 | + reverse = raw_field in self.reverse_fields |
| 274 | + |
| 275 | + if reverse: |
| 276 | + if stripped_param.startswith("-"): |
| 277 | + ordering.append(raw_field) |
| 278 | + else: |
| 279 | + ordering.append(f"-{raw_field}") |
| 280 | + else: |
| 281 | + ordering.append(stripped_param) |
| 282 | + |
| 283 | + return qs.order_by(*ordering) |
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