Re: GET and POST in forms. Please help me understand the logic!

I understand the confusion. Part of it is probably that GET and POST, is not part of Django per se, but part of the HTTP standard. 

Also confusing is that Django, especially in that code you pasted below, a lot is abstracted away. 

Sorry for the lack of detail, typing from iMe, just wanted to knock out a response. 

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Sincerely,

Thomas Murphy

646.957.6115

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On Nov 27, 2013, at 10:24 PM, Andrew Taylor <andydtaylor@gmail.com> wrote:

Hi,

I'm struggling with the concepts of get and post and where these status come from in the workflow. I have worked my way through the official pages on forms but I have not quite understood this to my satisfaction.

I get the gist that:

• get is for requesting data and 
• the query string parameters are visible 
• Running multiple get operations with say a bookmarked link has no negative effect

whereas with post

• post is for making database changes

Beyond this I am a little clueless.

• When does a request method get assigned? 
  
• In other words, with this code below, what would have made the request method become post (or get)? Is this related to a preceding view?
  
• Does a request object have to have a get or a post dictionary in it? Could it have neither?
• Does a request object going to a form have to have a get or a post dictionary in it?
• Is it the case that with "add_category.html" the page could open with neither a get or post in the request, and while the "add_category" view is running the request method POST could be assigned?
  
• Does a POST method invoke form validation?

Example:

def add_category(request, category_name_url=""):

    context = RequestContext(request)

    if request.method == 'POST':

        form = CategoryForm(request.POST)

        if form.is_valid():

            form.save(commit=True)

            return index(request)

        else:

            print form.errors

    else:

        form = CategoryForm

    return render_to_response('rango/add_category.html', {'form': form}, context)

Thanks,

Andy

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