This will create a JSON file of the specified name for data from a time range
specified in the URL.
Re-reading your post, it seems that perhaps you don’t actually want a physical
file but rather some JSON data to populate your browser window.Then Django Rest
Framework will do what you want after you add in some javascript to manage the
queries and populate the fields.
To be able to actually help I think you need to post more detailed questions,
either to get you started or to get things working.
hth
- Tom
class ExampleDumpView(View):
"""
Provide data in a downloaded CSV file.
"""
model = ExampleModel
prefix = “example"
class Echo:
"""
An object that implements just the write method of the file-like
interface.
"""
def write(self, value):
"""
Write the value by returning it, instead of storing in a buffer.
"""
return value
pass
def get(self, request, start, stop):
"""
Stream a (possibly) large file in CSV format.
"""
# Generate a sequence of rows.
(stime, etime) = times_from_ints(start, stop)
data = self.model.objects.within(stime, etime).order_by("time")
# assemble the rows
rows = []
rows.append(["time", “value"])
for entry in data:
rtime = entry.time
value = entry.value
row = [format_datetime(rtime), str(value)]
rows.append(row)
pass
# write out using example from the Django CSV HowTo...
fpath = path_from_times(self.prefix, stime, etime)
pseudo_buffer = self.Echo()
writer = csv.writer(pseudo_buffer)
response = StreamingHttpResponse((writer.writerow(row) for row in
rows), content_type="text/csv")
response["Content-Disposition"] = f"attachment; filename=\"{fpath}\""
return response
pass
> On Sep 22, 2022, at 3:23 AM, Matheus Bon <matheusbo...@gmail.com> wrote:
>
> Hi!
>
> I'm lost in a question of my project, I see so many methods on the internet
> but none work for me (maybe I'm implementing it wrongly)
>
> But, I would like to know if you could give me a method to transform my model
> into a JSON file and then be able to retrieve these JSON files for me to put
> in an INPUT with a dropdown, using, for example, SELECT2.
>
> Thanks!
>
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