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我想避免爲我的Google App Engine應用程序的不同模型創建Google Cloud Endpoints API的樣板代碼。假設我有一個Post，User和Category模型。數據存儲在數據存儲區中。我想用資源posts，users和categories創建一個REST API。我寫了下面的代碼，posts資源：Google Cloud Endpoints API的DRY代碼
import endpoints
from protorpc import messages
from protorpc import message_types
from protorpc import remote
from blog.models import Post
from cloud_endpoints import WEB_CLIENT_ID, ANDROID_CLIENT_ID, IOS_CLIENT_ID, ANDROID_AUDIENCE
class PostMessage(messages.Message):
id = messages.StringField(1)
title = messages.StringField(2)
body = messages.StringField(3)
class PostMessageCollection(messages.Message):
post_messages = messages.MessageField(PostMessage, 1, repeated=True)
def post_to_message(post):
return PostMessage(
id=str(post.key()),
title=post.title,
body=post.body)
ID_RESOURCE = endpoints.ResourceContainer(
message_types.VoidMessage,
id=messages.StringField(1, variant=messages.Variant.STRING))
PUT_RESOURCE = endpoints.ResourceContainer(
PostMessage,
id=messages.StringField(1, variant=messages.Variant.STRING))
POST_RESOURCE = endpoints.ResourceContainer(Post)
@endpoints.api(name='posts',
version='v1',
allowed_client_ids=[WEB_CLIENT_ID, ANDROID_CLIENT_ID, IOS_CLIENT_ID],
audiences=[ANDROID_AUDIENCE])
class PostsApi(remote.Service):
"""List"""
@endpoints.method(message_types.VoidMessage,
PostMessageCollection,
path='/posts',
http_method='GET',
name='posts.listPosts')
def list(self, unused_request):
post_messages = []
for post in Post.all():
post_messages.append(post_to_message(post))
return PostCollection(post_messages=post_messages)
"""Get"""
@endpoints.method(ID_RESOURCE,
PostMessage,
path='/posts/{id}',
http_method='GET',
name='posts.getPost')
def get(self, request):
try:
return post_to_message(Post.get(request.id))
except (IndexError, TypeError):
raise endpoints.NotFoundException('Post %s not found.' % (request.id,))
"""Create"""
@endpoints.method(POST_RESOURCE,
message_types.VoidMessage,
path='/posts',
http_method='POST',
name='posts.createPost')
def create(self, request):
post = Post(title=request.title, body=request.body)\
post.put()
return message_types.VoidMessage()
"""Update"""
@endpoints.method(PUT_RESOURCE,
message_types.VoidMessage,
path='/posts/{id}',
http_method='POST',
name='posts.updatePost')
def update(self, request):
try:
post = Post.get(request.id)
post.title = request.title
post.body = request.body
return message_types.VoidMessage()
except (IndexError, TypeError):
raise endpoints.NotFoundException('Post %s not found.' % (request.id,))
"""Delete"""
@endpoints.method(ID_RESOURCE,
message_types.VoidMessage,
path='/posts/{id}',
http_method='DELETE',
name='posts.deletePost')
def delete(self, request):
try:
post = Post.get(request.id)
post.delete()
return message_types.VoidMessage()
except (IndexError, TypeError):
raise endpoints.NotFoundException('Post %s not found.' % (request.id,))
我可以複製/粘貼此代碼，改變「後」到「類別」隨處可見，編輯PostMessage，PostMessageCollection和post_to_message，但這似乎是不好的做法。我不想重複自己。是否可以創建一個抽象API類併爲PostAPI，CategoryAPI和UserAPI創建子類？還是有更好的方法來參數化Post，PostMessage,PostMessageCollection,post_to_message和資源路徑（「/ posts」，「/ categories」和「/ users」），以便我不必複製/粘貼類爲每個資源？這些類將使用相同的裝飾器具有相同的方法，並且我不想爲每個資源重複該方法。我使用Python 2.7。