Image not showing: NetworkError: 404 NOT FOUND

[Spokes]

I'm doing something pretty routine in defining a db table in a class within a file in modules, and later, attempting to display an image associated with that table. The table is defined like so:

class Image:

    def __init__(self, db, auth_signature, session, request, response):
        ...

        if not 't_image' in db.tables:
            self.db.define_table('t_image',      
                Field('f_user_id', type="reference auth_user", readable=False, writable=False,
                       default=session.auth.user.id if session.auth else ''),
                Field('image',type="upload",
                      requires = (IS_EMPTY_OR(IS_IMAGE(
                      error_message = current.T('Error...'),
                      extensions = ('jpeg','jpg','png','bmp','gif'), maxsize = (1200, 1200))),IS_LENGTH(524288)),
                      label = current.T('Image'), autodelete = True, uploadseparate = True),  
                     
                     ...
                     
                self.auth_signature)

In attempting to display the image, I'm doing something like this in a non-default controller (I tried the equivalent in the default controller, and that didn't change anything):
               

def show_user():
    ...
    from user_custom import Image
    cl__image = Image(db = db, auth_signature = auth.signature, session = session,
           request = request, response = response)

    row__image = db(db.t_image.f_user_id == user_id).select('image').first()
    image_filename = row__image['image']

    img = IMG(_src = URL('default', 'download/' + image_filename, extension = False))
    ...
    return dict(img = img)

This produces a "NetworkError: 404 NOT FOUND" error. A blank image container appears on the screen, and examining it, the url that shows up looks reasonable, and seems to point to the appropriate file. Any ideas as to what could be going on and how to fix it? Thank you.
   

[Leonel Câmara]

This can be simplified:

    cl__image = Image(db = db, auth_signature = auth.signature, session = session, 
           request = request, response = response)

to:

    cl__image = Image(db, auth.signature, session, request, response)

Consider using current in your module so you don't have to pass everything as an argument.

Anyway, if you change this does it work

    row = db(db.t_image.f_user_id == user_id).select(db.t_image.image).first()
    img = IMG(_src = URL('default', 'download', args=row.image))
    return dict(img = img)

[Spokes]

Consider using current in your module so you don't have to pass everything as an argument.

Awesome - thanks! I had no idea about that; was previously just using current to access current.T().

Anyway, if you change this does it work

Thanks, Leonel. The suggested changes didn't fix it, however. Looking at the source of the image which isn't showing, I'm seeing the same URL as was produced with the code I was previously using (127.0.0.1:8000/[app name]/default/download/[file name]). The same error message is still being produced.

[Leonel Câmara]

I think I figured it out. The problem is that the table t_image isn't defined in the download function. Because it's only defined when you instantiate an Image.

Consider making a @staticmethod define_tables in Image that will define the table and call it in the models.

[Spokes]

I tried the following:

def download():
    print "\ndb.tables:", db.tables
    print "\ndb.tables fields:", db['t_image'].fields
    return response.download(request,db)

It does show that t_image is part of the db definition, and that all the fields that should be there are present.

[Spokes]

Tried the approach of adding the table in the modules as well; it didn't produce any change in the results.

Any other possibilities for what could be going on? Could it be a windows filesystem issue (although I've got uploads with more unwieldy names associated with other tables)?

On Saturday, October 18, 2014 11:01:25 AM UTC-5, Leonel Câmara wrote: