i'm using the blobstore so i can upload images larger than 1mb. because of that i have access to http://code.google.com/appengine/docs/python/images/functions.html#Image_get_serving_url which gives a URL that google serves up the image (and does not count against CPU for your app engine app).
my image upload is a variant of http://www.web2pyslices.com/slices/take_slice/63 cfh. On Sunday, February 26, 2012 6:13:14 AM UTC-8, Anthony wrote: > > On Sunday, February 26, 2012 12:19:17 AM UTC-5, Peter G. wrote: >> >> How would one obtain the URL to a image blob stored on GAE's >> datastore? A lot of the threads I've looked at were all for generating >> an download output for views, but I need this for the Controller since >> I'm returning this as a JSON element. >> >> For example, the auth_user table has a field 'avatar' and another blob >> field 'avatar_blob'. Ideally I can simply return a JSON like: >> { "avatar": "http://<domain>/<app>/avatars/username_avatar.gif" } >> >> Where username_avatar.gif would map to the stored blob image for that >> user's avatar. > > > Assuming you use web2py's standard "upload" field type to upload the > images, then you would still use the standard download process as well. See > the "Uploading files in database" section in > http://web2py.com/books/default/chapter/29/13 for details on setting up > database storage of uploads. And for downloading, see the > response.download description here: > http://web2py.com/books/default/chapter/29/4#response. In your case, it > would be something like: > > db.define_table('auth_user', > ..., > Field('avatar', 'upload', uploadfield='avatar_blob'), > Field('avatar_blob', 'blob'), ...) > > def download(): > return response.download(request, db) > > URL for a particular user's avatar: > > URL('default', 'download', args=auth.user.avatar) > > Anthony > > On Sunday, February 26, 2012 6:13:14 AM UTC-8, Anthony wrote: > > On Sunday, February 26, 2012 12:19:17 AM UTC-5, Peter G. wrote: >> >> How would one obtain the URL to a image blob stored on GAE's >> datastore? A lot of the threads I've looked at were all for generating >> an download output for views, but I need this for the Controller since >> I'm returning this as a JSON element. >> >> For example, the auth_user table has a field 'avatar' and another blob >> field 'avatar_blob'. Ideally I can simply return a JSON like: >> { "avatar": "http://<domain>/<app>/avatars/username_avatar.gif" } >> >> Where username_avatar.gif would map to the stored blob image for that >> user's avatar. > > > Assuming you use web2py's standard "upload" field type to upload the > images, then you would still use the standard download process as well. See > the "Uploading files in database" section in > http://web2py.com/books/default/chapter/29/13 for details on setting up > database storage of uploads. And for downloading, see the > response.download description here: > http://web2py.com/books/default/chapter/29/4#response. In your case, it > would be something like: > > db.define_table('auth_user', > ..., > Field('avatar', 'upload', uploadfield='avatar_blob'), > Field('avatar_blob', 'blob'), ...) > > def download(): > return response.download(request, db) > > URL for a particular user's avatar: > > URL('default', 'download', args=auth.user.avatar) > > Anthony > > On Sunday, February 26, 2012 6:13:14 AM UTC-8, Anthony wrote: > > On Sunday, February 26, 2012 12:19:17 AM UTC-5, Peter G. wrote: >> >> How would one obtain the URL to a image blob stored on GAE's >> datastore? A lot of the threads I've looked at were all for generating >> an download output for views, but I need this for the Controller since >> I'm returning this as a JSON element. >> >> For example, the auth_user table has a field 'avatar' and another blob >> field 'avatar_blob'. Ideally I can simply return a JSON like: >> { "avatar": "http://<domain>/<app>/avatars/username_avatar.gif" } >> >> Where username_avatar.gif would map to the stored blob image for that >> user's avatar. > > > Assuming you use web2py's standard "upload" field type to upload the > images, then you would still use the standard download process as well. See > the "Uploading files in database" section in > http://web2py.com/books/default/chapter/29/13 for details on setting up > database storage of uploads. And for downloading, see the > response.download description here: > http://web2py.com/books/default/chapter/29/4#response. In your case, it > would be something like: > > db.define_table('auth_user', > ..., > Field('avatar', 'upload', uploadfield='avatar_blob'), > Field('avatar_blob', 'blob'), ...) > > def download(): > return response.download(request, db) > > URL for a particular user's avatar: > > URL('default', 'download', args=auth.user.avatar) > > Anthony > >
