def get_field_info(self, field):
        """
        Given an instance of a serializer field, return a dictionary
        of metadata about it.
        """
        field_info = OrderedDict()
        serializer = field.parent

        if isinstance(field, serializers.ManyRelatedField):
            field_info['type'] = self.type_lookup[field.child_relation]
        else:
            field_info['type'] = self.type_lookup[field]

        try:
            serializer_model = getattr(serializer.Meta, 'model')
            field_info['relationship_type'] = self.relation_type_lookup[getattr(serializer_model, field.field_name)]
        except __HOLE__:
            pass
        except AttributeError:
            pass
        else:
            field_info['relationship_resource'] = get_related_resource_type(field)

        field_info['required'] = getattr(field, 'required', False)

        attrs = [
            'read_only', 'write_only', 'label', 'help_text',
            'min_length', 'max_length',
            'min_value', 'max_value', 'initial'
        ]

        for attr in attrs:
            value = getattr(field, attr, None)
            if value is not None and value != '':
                field_info[attr] = force_text(value, strings_only=True)

        if getattr(field, 'child', None):
            field_info['child'] = self.get_field_info(field.child)
        elif getattr(field, 'fields', None):
            field_info['children'] = self.get_serializer_info(field)

        if (not field_info.get('read_only')
            and hasattr(field, 'choices')
            and not field_info.get('relationship_resource')):
            field_info['choices'] = [
                {
                    'value': choice_value,
                    'display_name': force_text(choice_name, strings_only=True)
                }
                for choice_value, choice_name in field.choices.items()
            ]

        if hasattr(serializer, 'included_serializers') and 'relationship_resource' in field_info:
            field_info['allows_include'] = field.field_name in serializer.included_serializers

        return field_info
dataset/ETHPy150Open django-json-api/django-rest-framework-json-api/rest_framework_json_api/metadata.py/JSONAPIMetadata.get_field_info