Peter,
I was trying to get this to work last week and this is what finally worked
for me.
Here's a link to my earlier thread on the same topic.
https://groups.google.com/forum/?fromgroups#!topic/web2py/1h3Nd3_T9Js
In my case I'm storing small blobs in the table/model - although that's not
the best approach.
However I was surprised that I has to make an explicit reference to the
blob field, as I expected
that to be handled implicitly.
If there's a better way here, plaese let me know. The following should work
for you:
def show_image():
"""
return image - this method is referenced from the view - see below
"""
if not request.args[0]: return None
id = request.args[0]
image=db(db.imgtbl.id==id).select()
return image[0].image_blob
my view code
{{extend 'layout.html'}}
<h3>Display Jpeg Images</h3>
<table border="1">
<tr>
<th>Image Title</th>
<th>Image</th>
</tr>
{{for img in images:}}
<tr>
{{= TD(img.title)}}
{{= TD(IMG(_src=URL("show_image", args=img.id),
_alt=img.title)) }}
</tr>
{{pass}}
</table>
On Monday, February 27, 2012 12:01:55 PM UTC-8, howesc wrote:
>
> 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_urlwhich
> 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
>>
>>
