234.8.py

from app import api_root
from flask_restful import Resource, marshal_with, fields


class IPField(fields.Raw):
    def format(self, value):
        parts = value.split('.')
        parts[1] = '***'
        return '.'.join(parts)


class AnonymousField(fields.Raw):
    def output(self, key, obj):
        if obj['is_anonymous']:
            return None
        else:
            return fields.get_value(self.attribute, obj)


document_list_fields = {
    'id': fields.Integer(attribute='id'),
    'title': fields.String(attribute='title', default='title of document'),
    'content': fields.String(attribute='content'),
    'ip': IPField(attribute='ip'),
    'writer': {
        'id': AnonymousField(attribute='writer.id'),
        'name': AnonymousField(attribute='writer.name')
    }
}


@api_root.resource('/documents')
class DocumentListAPI(Resource):
    @marshal_with(document_list_fields, envelope='items')
    def get(self):
        writer1 = {'id': 100, 'name': 'writer1'}
        writer2 = {'id': 101, 'name': 'writer2'}
        items = [
            {'id': 1, 'writer': writer1, 'title': 'title1', 'content': 'content1', 'ip': '1.2.3.4', 'is_anonymous': True},
            {'id': 2, 'writer': writer1, 'title': None, 'content': 'content2', 'ip': '5.6.7.8', 'is_anonymous': False},
            {'id': 3, 'writer': writer2, 'title': 'title3', 'content': 'content3', 'ip': '9.10.11.12', 'is_anonymous': True}
        ]

        return items