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137 lines
5.1 KiB
137 lines
5.1 KiB
# -*- coding: utf-8 -*-
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#
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from __future__ import unicode_literals
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from collections import OrderedDict
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import datetime
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from itertools import chain
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from django.core.exceptions import PermissionDenied
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from django.http import Http404
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from django.utils.encoding import force_text
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from rest_framework.fields import empty
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from rest_framework.metadata import SimpleMetadata
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from rest_framework import exceptions, serializers
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from rest_framework.request import clone_request
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class SimpleMetadataWithFilters(SimpleMetadata):
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"""Override SimpleMetadata, adding info about filters"""
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methods = {"PUT", "POST", "GET", "PATCH"}
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attrs = [
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'read_only', 'label', 'help_text',
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'min_length', 'max_length',
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'min_value', 'max_value', "write_only",
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]
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def determine_actions(self, request, view):
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"""
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For generic class based views we return information about
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the fields that are accepted for 'PUT' and 'POST' methods.
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"""
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actions = {}
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for method in self.methods & set(view.allowed_methods):
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if hasattr(view, 'action_map'):
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view.action = view.action_map.get(method.lower(), view.action)
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view.request = clone_request(request, method)
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try:
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# Test global permissions
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if hasattr(view, 'check_permissions'):
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view.check_permissions(view.request)
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# Test object permissions
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if method == 'PUT' and hasattr(view, 'get_object'):
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view.get_object()
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except (exceptions.APIException, PermissionDenied, Http404):
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pass
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else:
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# If user has appropriate permissions for the view, include
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# appropriate metadata about the fields that should be supplied.
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serializer = view.get_serializer()
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actions[method] = self.get_serializer_info(serializer)
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finally:
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view.request = request
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return actions
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def get_field_info(self, field):
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"""
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Given an instance of a serializer field, return a dictionary
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of metadata about it.
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"""
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field_info = OrderedDict()
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field_info['type'] = self.label_lookup[field]
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field_info['required'] = getattr(field, 'required', False)
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default = getattr(field, 'default', None)
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if default is not None and default != empty:
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if isinstance(default, (str, int, bool, datetime.datetime, list)):
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field_info['default'] = default
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for attr in self.attrs:
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value = getattr(field, attr, None)
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if value is not None and value != '':
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field_info[attr] = force_text(value, strings_only=True)
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if getattr(field, 'child', None):
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field_info['child'] = self.get_field_info(field.child)
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elif getattr(field, 'fields', None):
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field_info['children'] = self.get_serializer_info(field)
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if not isinstance(field, (serializers.RelatedField, serializers.ManyRelatedField)) \
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and hasattr(field, 'choices'):
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field_info['choices'] = [
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{
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'value': choice_value,
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'display_name': force_text(choice_name, strings_only=True)
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}
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for choice_value, choice_name in field.choices.items()
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]
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return field_info
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def get_filters_fields(self, request, view):
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fields = []
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if hasattr(view, 'get_filter_fields'):
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fields = view.get_filter_fields(request)
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elif hasattr(view, 'filter_fields'):
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fields = view.filter_fields
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elif hasattr(view, 'filterset_fields'):
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fields = view.filterset_fields
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elif hasattr(view, 'get_filterset_fields'):
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fields = view.get_filterset_fields(request)
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elif hasattr(view, 'filterset_class'):
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fields = list(view.filterset_class.Meta.fields) + \
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list(view.filterset_class.declared_filters.keys())
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if hasattr(view, 'custom_filter_fields'):
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# 不能写 fields += view.custom_filter_fields
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# 会改变 view 的 filter_fields
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fields = list(fields) + list(view.custom_filter_fields)
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if isinstance(fields, dict):
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fields = list(fields.keys())
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return fields
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def get_ordering_fields(self, request, view):
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fields = []
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if hasattr(view, 'get_ordering_fields'):
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fields = view.get_ordering_fields(request)
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elif hasattr(view, 'ordering_fields'):
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fields = view.ordering_fields
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return fields
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def determine_metadata(self, request, view):
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metadata = super(SimpleMetadataWithFilters, self).determine_metadata(request, view)
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filterset_fields = self.get_filters_fields(request, view)
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order_fields = self.get_ordering_fields(request, view)
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meta_get = metadata.get("actions", {}).get("GET", {})
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for k, v in meta_get.items():
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if k in filterset_fields:
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v["filter"] = True
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if k in order_fields:
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v["order"] = True
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return metadata
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