Question

Like many others, I’ve been learning web development on django through building a test app. I’ve the basic models set up. I’ve populated a few of the tables with the absolute minimum data needed for further testing though using fixtures.

Now for a different table, I want to create data tuples through a custom management command which takes the required arguments. If this works as expected, I’ll save the created data to the database by adding the --save option.

The syntax of the command is like this

create_raw_data owner_id temperature [--save]

where owner_id is required and temperature (in C) is optional. Within the Handle method, I’m using factory boy to create the raw_data with the given arguments etc.

I did have some issues but searching on SO, google, django docs etc, I’ve got the command working fine.

EXCEPT when I input a negative temperature…

Then I get the following error

Usage: C:\test\manage.py create_raw_data [options] 

Creates a RawData object. Usage:  create_raw_data owner_id temperature [--save]

C:\test\manage.py: error: no such option: -5

The code I have for parsing the args is like this

for index, item in enumerate(args):
    if index == 0:
        owner_id = int(item)
    else index == 1:
        temp = int(item)

I put a print(args) as the 1st line inside Handle but it seems the control is not even reaching here.

I’m not sure what is wrong… please help…

Thanks a lot

Answer 1

got the issue fixed so providing an answer to others who may come across this.

The issue was with parse_args method of optparse. I’ve read in a number of places that though optparse is deprecated and instead argparse is recommended, django recommends using optparse since that is what it uses. Long story short, the link at link suggested a few alternatives and using create_raw_data 1 -- -5 works as expected. So I did get a workaround. Thanks.