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

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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