SO: Django - form not validating

I posted this yesterday, however, no one answered me on SO. So I experimented a bit and searched for a while online, finally I figured it out… Most of the seemingly unsolvable mystery caused by the holes in the knowledge. Luckily, they can be patched:

  1. apparently, you need to bind uploaded images to a form, that is:
    • adding enctype="multipart/form-data" in the form tag
    • when you use the form, you need to bind the file data.
  2. use request.FILES as well as request.POST in views.py working out the logic

SO: Bootstrap 4 - table -column sizing

<thead>
     <tr>
           <th class="w-25">25</th>
           <th class="w-50">50</th>
           <th class="w-25">25</th>
     </tr>
</thead>

or

<table class="table table-bordered">
        <thead>
            <tr class="d-flex">
                <th class="col-3">25%</th>
                <th class="col-3">25%</th>
                <th class="col-6">50%</th>
            </tr>
        </thead>
        <tbody>
            <tr class="d-flex">
                <td class="col-sm-3">..</td>
                <td class="col-sm-3">..</td>
                <td class="col-sm-6">..</td>
            </tr>
        </tbody>
</table>

Django - build_absolute_uri, official doc

>>> request.build_absolute_uri()
'https://example.com/music/bands/the_beatles/?print=true'
>>> request.build_absolute_uri('/bands/')
'https://example.com/bands/'
>>> request.build_absolute_uri('https://example2.com/bands/')
'https://example2.com/bands/'

SO post

DetailView kwarg setting

if you wish not use pk as the default queryset kwarg, you can change it by defining pk_url_kwarg = 'ref' in the view.

*args and **kwargs

  • *args and **kwargs can represent a number of arguments when defining a function
  • they can also be used to call a function requires positional parameters

SO: prevent repeat form submission

Easy fix on client side: onclick="this.disabled=true,this.form.submit();" attribute added on submit button, however, server side should be double prove as well… check the post