image = Image.get_by_id(timeline.photo)という風に取得していた。from appengine_django import models
from google.appengine.ext import db
class Timeline(models.BaseModel):
"""
Usage::
user = users.get_current_user()
message = 'test'
timeline = Timeline(author = user, message = message)
timeline.save()
"""
author = db.UserProperty()
message = db.StringProperty(_('message'), required=True)
photo = db.IntegerProperty()
class Image(models.BaseModel):
author = db.UserProperty(required=True)
# image
data = db.BlobProperty(required=True)
format = db.StringProperty(required=True)
from google.appengine.api import users, images
from django.core.files.uploadedfile import SimpleUploadedFile as UploadedFile
file = request.FILES['image']
format = file.content_type
data = images.Image(file.read())._image_data
author = users.get_current_user()
image = Image(author = author, data = data, format = format)
image.put()
timeline = Timeline(author = author, message = 'test', photo = image.key().id())
timeline.put()
今後、どこかのサービスのように画像以外に、リンクや、Youtubeのビデオ、ファイルなどをアップできるようにする時は、Timelineを改造しないといけない（※実際は定数で、Timelineが何を含んでいるのかを持っていた）。でっ待望のPolyModelに書き換えた。
from appengine_django import models
from google.appengine.ext import db
from google.appengine.ext.db import polymodel
class Timeline(polymodel.PolyModel):
"""
Usage::
user = users.get_current_user()
message = 'test'
timeline = Timeline(author = user, message = message)
timeline.save()
"""
author = db.UserProperty()
message = db.StringProperty(_('message'), required=True)
photo = db.IntegerProperty()
class ImageTimeline(Timeline):
# image
data = db.BlobProperty(required=True)
format = db.StringProperty(required=True)
@classmethod
def class_name(cls):
return 'Photo'
from google.appengine.api import users, images
from django.core.files.uploadedfile import SimpleUploadedFile as UploadedFile
file = request.FILES['image']
format = file.content_type
data = images.Image(file.read())._image_data
author = users.get_current_user()
image = ImageTimeline(author = author, message = 'test', data = data, format = format)
image.put()
# get photos
imagetimelines = Timeline.all().filter('class =', 'Photo')
PolyModelを使うと、あるモデルを派生してかけるので、Timelineに持たせたいアイテムが増えたら増えた分だけモデルを書いていけばいい。影響範囲は案外少ない（diffはここ）。拡張したくなりそうなモデルはすべてPolyModelで。