I'm writing an app that will generate, store, and display chart images. The
idea is this: When a site visitor requests a given chart image, the app
will check to see if it already exists. If not, the app will generate and
store the necessary image before displaying it.
Towards that end, I have a Chart model with an ImageField:
class Chart(models.Model):
pattern = models.ForeignKey(Pattern)
symbols = models.BooleanField()
rguides = models.BooleanField('row guides')
cguides = models.BooleanField('column guides')
hreps = models.SmallIntegerField('horizontal repeats', choices =
REPS_CHOICES)
vreps = models.SmallIntegerField('vertical repeats', choices =
REPS_CHOICES)
image = models.ImageField(upload_to = 'charts/%Y/%m')
So far, so good. From the admin interface, I and view my Charts and upload
image files.
Here's my question: What's the best way of saving images that I generate?
>From what I've read, it seems that my only choice is to create a temporary
file, wrap it in a ImageFile object, use it in the construction of a new
Chart, call save() on the chart, and delete the temporary file. But given
that my image-generation code writes to any file-like object, this strikes
me as inefficient. Is there any way to create an ImageFile object and
retrieve from it a writable fobj?
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