如何正确使用Images Python API来显示带有用户评论的头像？

发布于 2024-10-05 13:48:30 字数 7092 浏览 1 评论 0原文

这是我的上一个问题的后续问题。我正在尝试按照示例应用

这是我正在使用的代码：

在 upload.py 中，我有：

from google.appengine.api import images

class Upload(webapp.RequestHandler):
    def get(self):
    self.response.out.write("""
          <form action="/avatar-save" enctype="multipart/form-data" method="post">                
            <div><label>Avatar:</label></div>
            <div><input type="file" name="img"/></div>
          </form>
        </body>
      </html>""")

class AvatarSave(webapp.RequestHandler):
    def post(self):
        avatar = images.resize(self.request.get("img"), 32, 32)
        greeting.avatar = db.Blob(avatar)
        greeting.put()
        self.redirect('/')


application = webapp.WSGIApplication(
                                 [('/upload', Upload),
                                  ('/avatar-save', AvatarSave),
                                  ],
                                 debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

我的第一个问题是：如何检查 AvatarSave 是否确实将图像保存到数据存储区？

我尝试在 hw.py 中显示图像：

class MainPage(webapp.RequestHandler):
    def get(self):
    siteUser = users.get_current_user()
    greeting = None        
    if siteUser:
        greeting = ("Welcome, %s! (<a href=\"%s\">sign out</a>)" %
                    (siteUser.nickname(), users.create_logout_url("/")))
    else:
        greeting = ("<a href=\"%s\">Sign in or register</a>" %
                    users.create_login_url("/"))

    self.response.out.write(greeting)           

    query = User.all()
    query.order("-userScore")
    results = query.fetch(10)
    self.response.out.write("""<html><head><style>
                               body {font-size: small;
                                     font-family: Verdana, Helvetica, sans-serif;
                                    }</style>
                                    </head><body><ol>""")
    for result in results:
        self.response.out.write("<li>")
        self.response.out.write("<b>%s</b> %s " % (result.userName, result.userLatestComment))
        self.response.out.write("<div><img src='img?img_id=%s'></img>" % result.key())
        self.response.out.write("</li>")
    self.response.out.write("</ol></body></html>")


class Image (webapp.RequestHandler):
    def get(self):
        greeting = db.get(self.request.get("img_id"))
        if greeting.avatar:
            self.response.headers['Content-Type'] = "image/png"
            self.response.out.write(greeting.avatar)
    else:
        self.response.out.write("No image")


application = webapp.WSGIApplication(
                                 [('/', MainPage),
                                  ('/img', Image),
                                  ],
                                 debug=True)

但我得到的只是显示的每行的损坏的图像链接图标。（我显示了 8 行。）

在日志中我看到了这一点：

INFO     2010-12-04 01:03:57,641 dev_appserver.py:3283] "GET / HTTP/1.1" 200 -
INFO     2010-12-04 01:03:57,703 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBMM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:57,756 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBUM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,734 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBIM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,812 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFkM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,878 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFsM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,934 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFoM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,986 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGGkM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:59,040 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGGwM HTTP/1.1" 200 -
INFO     2010-12-04 01:04:00,102 dev_appserver.py:3283] "GET /favicon.ico HTTP/1.1" 200 -

据我了解，一些图像是从数据存储中获取的；但我只上传了 1 张图片（或者我以为我上传了），但根据日志，每个图片的 id 都不同。

谁能帮我理解这里发生了什么；以及如何解决它？非常感谢您的帮助。

更新

响应Ben 的回答我更新了代码，如下所示：

这是我正在使用的模型：

class User(db.Model):
    userEmail = db.StringProperty()
    ....
    avatar = db.BlobProperty()

这是新的 AvatarSave：

class AvatarSave(webapp.RequestHandler):
    def post(self):
        q = User.all()
        q.filter("userEmail =", "[email protected]")
        qTable = q.fetch(1)
        if qTable:
            for row in qTable:
            avatar = images.resize(self.request.get("img"), 32, 32)
            row.avatar = db.Blob(avatar)
            db.put(qTable)
        else:
            self.response.out.write("user not found")

        self.redirect('/')

我相信现在会更新与 userEmail 关联的用户头像 "[电子邮件受保护]”。这是正确的吗？

我更新了 hw.py 以仅显示此用户：

query = User.all()
    query.filter("userEmail =", "[email protected]")
    results = query.fetch(1)
    self.response.out.write("""<html><head><style>
                               body {font-size: small;
                                     font-family: Verdana, Helvetica, sans-serif;
                                    }</style>
                                    </head><body><ol>""")
    for result in results:
        self.response.out.write("<li>")
        self.response.out.write("<b>%s</b> %s " % (result.userName, result.userLatestComment))
        self.response.out.write("<div><img src='img?img_id=%s'></img>" % result.key())
        self.response.out.write("</li>")
    self.response.out.write("</ol></body></html>")

但是仍然存在问题，因为我没有显示图像，而是得到 "None" 并且图像链接是破碎的。

此外，当我查看Datastore Viewer时，我没有看到“avatar”列。但我看到一些斑点在某个时候被更新：

Entity Kind: __BlobUploadSession__
Key: ag10ZWxs....
ID: 125
Key Name:
creation: 1291388993.27
state: init
success_path: /upload

不确定这里发生了什么以及如何修复它。任何建议都将受到欢迎。

原文

This is a follow up question to my previous question. I am trying to upload and display an image as an avatar following the sample app here.

This is the code I am using:

In upload.py I have:

from google.appengine.api import images

class Upload(webapp.RequestHandler):
    def get(self):
    self.response.out.write("""
          <form action="/avatar-save" enctype="multipart/form-data" method="post">                
            <div><label>Avatar:</label></div>
            <div><input type="file" name="img"/></div>
          </form>
        </body>
      </html>""")

class AvatarSave(webapp.RequestHandler):
    def post(self):
        avatar = images.resize(self.request.get("img"), 32, 32)
        greeting.avatar = db.Blob(avatar)
        greeting.put()
        self.redirect('/')


application = webapp.WSGIApplication(
                                 [('/upload', Upload),
                                  ('/avatar-save', AvatarSave),
                                  ],
                                 debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

My first question is: How do I check that AvatarSave actually saves the image to datastore?

I try to display the image in hw.py:

class MainPage(webapp.RequestHandler):
    def get(self):
    siteUser = users.get_current_user()
    greeting = None        
    if siteUser:
        greeting = ("Welcome, %s! (<a href=\"%s\">sign out</a>)" %
                    (siteUser.nickname(), users.create_logout_url("/")))
    else:
        greeting = ("<a href=\"%s\">Sign in or register</a>" %
                    users.create_login_url("/"))

    self.response.out.write(greeting)           

    query = User.all()
    query.order("-userScore")
    results = query.fetch(10)
    self.response.out.write("""<html><head><style>
                               body {font-size: small;
                                     font-family: Verdana, Helvetica, sans-serif;
                                    }</style>
                                    </head><body><ol>""")
    for result in results:
        self.response.out.write("<li>")
        self.response.out.write("<b>%s</b> %s " % (result.userName, result.userLatestComment))
        self.response.out.write("<div><img src='img?img_id=%s'></img>" % result.key())
        self.response.out.write("</li>")
    self.response.out.write("</ol></body></html>")


class Image (webapp.RequestHandler):
    def get(self):
        greeting = db.get(self.request.get("img_id"))
        if greeting.avatar:
            self.response.headers['Content-Type'] = "image/png"
            self.response.out.write(greeting.avatar)
    else:
        self.response.out.write("No image")


application = webapp.WSGIApplication(
                                 [('/', MainPage),
                                  ('/img', Image),
                                  ],
                                 debug=True)

But all I get is the broken image link icon for each line displayed. (I have 8 lines displayed.)

In the Logs I see this:

INFO     2010-12-04 01:03:57,641 dev_appserver.py:3283] "GET / HTTP/1.1" 200 -
INFO     2010-12-04 01:03:57,703 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBMM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:57,756 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBUM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,734 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGBIM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,812 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFkM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,878 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFsM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,934 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGFoM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:58,986 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGGkM HTTP/1.1" 200 -
INFO     2010-12-04 01:03:59,040 dev_appserver.py:3283] "GET /img?img_id=ag1oZWxsby0xLXdvcmxkcgoLEgRVc2VyGGwM HTTP/1.1" 200 -
INFO     2010-12-04 01:04:00,102 dev_appserver.py:3283] "GET /favicon.ico HTTP/1.1" 200 -

As far as I understand, some images are fetched from the datastore; but I uploaded only 1 image (or I thought I did) but according to the logs the id for each image is different.

Can anyone help me understand what is going on here; and how to fix it? Many thanks for your help.

Update

In response to Ben's answer I updated the code like this:

This is the model I am using:

class User(db.Model):
    userEmail = db.StringProperty()
    ....
    avatar = db.BlobProperty()

and this is new AvatarSave:

class AvatarSave(webapp.RequestHandler):
    def post(self):
        q = User.all()
        q.filter("userEmail =", "[email protected]")
        qTable = q.fetch(1)
        if qTable:
            for row in qTable:
            avatar = images.resize(self.request.get("img"), 32, 32)
            row.avatar = db.Blob(avatar)
            db.put(qTable)
        else:
            self.response.out.write("user not found")

        self.redirect('/')

I believe this now updates the avatar of the user associated with the userEmail "[email protected]". Is this correct?

I updated hw.py to display only this user as well:

query = User.all()
    query.filter("userEmail =", "[email protected]")
    results = query.fetch(1)
    self.response.out.write("""<html><head><style>
                               body {font-size: small;
                                     font-family: Verdana, Helvetica, sans-serif;
                                    }</style>
                                    </head><body><ol>""")
    for result in results:
        self.response.out.write("<li>")
        self.response.out.write("<b>%s</b> %s " % (result.userName, result.userLatestComment))
        self.response.out.write("<div><img src='img?img_id=%s'></img>" % result.key())
        self.response.out.write("</li>")
    self.response.out.write("</ol></body></html>")

But there is still a problem because instead of displaying the image, I get "None" and the image link is broken.

Furthermore, when I look at the Datastore Viewer, I don't see the "avatar" column. But I see that some blob was updated at some point:

Entity Kind: __BlobUploadSession__
Key: ag10ZWxs....
ID: 125
Key Name:
creation: 1291388993.27
state: init
success_path: /upload

Not sure what is going on here and how to fix it. Any suggestion will be welcome.

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捶死心动 2024-10-12 13:48:30

在日志中，您会看到不同的图像 ID，因为您从数据存储区请求最多 10 个用户对象，并且数据存储区查询正在查找用户，无论他们是否存储了图像（也许您创建了 8 个用户对象）测试过程中的对象）。

至于为什么头像没有保存：

class AvatarSave(webapp.RequestHandler):
    def post(self):
        avatar = images.resize(self.request.get("img"), 32, 32)
        greeting.avatar = db.Blob(avatar)

除非您的示例中缺少某些代码，否则此处不会设置“greeting”变量。您必须首先创建一个新的问候语（通过创建它使用的任何模型的新实例）或加载适当的问候语，然后为其设置头像，然后greeting.put()

更新

如果您的代码缩进如下：

    qTable = q.fetch(1)
    if qTable:
        for row in qTable:
        avatar = images.resize(self.request.get("img"), 32, 32)
        row.avatar = db.Blob(avatar)
        db.put(qTable)

它将不起作用。您想要的可能是：

    qTable = q.fetch(1)
    if qTable:
        for row in qTable:
            avatar = images.resize(self.request.get("img"), 32, 32)
            row.avatar = db.Blob(avatar)
        db.put(qTable)

但是由于您在这里只使用一个对象，因此替换当前使用的 fetch(1) 会更简单，而是执行以下操作：

    currentUser = q.get()
    if currentUser is not None:
        avatar = images.resize(self.request.get("img"), 32, 32)
        currentUser.avatar = db.Blob(avatar)
        currentUser.put()

In the log, you're seeing different image IDs because you're requesting up to 10 user objects from the Datastore, and the Datastore query is looking for the users regardless of whether or not they have an image stored (maybe you made 8 User objects in the course of testing).

As to why the avatars aren't saving:

class AvatarSave(webapp.RequestHandler):
    def post(self):
        avatar = images.resize(self.request.get("img"), 32, 32)
        greeting.avatar = db.Blob(avatar)

Unless some code is missing from your example, the "greeting" variable is not set here. You have to first create a new greeting (by making a new instance of whatever model it uses) or load the appropriate one, then set the avatar to it, then greeting.put()

Update

If your code is indented like:

    qTable = q.fetch(1)
    if qTable:
        for row in qTable:
        avatar = images.resize(self.request.get("img"), 32, 32)
        row.avatar = db.Blob(avatar)
        db.put(qTable)

It will not work. What you want is probably:

    qTable = q.fetch(1)
    if qTable:
        for row in qTable:
            avatar = images.resize(self.request.get("img"), 32, 32)
            row.avatar = db.Blob(avatar)
        db.put(qTable)

But since you're working with only one object here, it would be simpler to replace your current use of fetch(1) and instead do:

    currentUser = q.get()
    if currentUser is not None:
        avatar = images.resize(self.request.get("img"), 32, 32)
        currentUser.avatar = db.Blob(avatar)
        currentUser.put()

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