Re: Any way to select which Model to initialize without resorting to "if-elfi" statements?

You can always pre-define them all in a dict:

cat2form = {'TV': TVForm, 'Laptop': LaptopForm}

model_form = cat2form[category]

model_form_instance = model_form()

This way you forms don't have to follow a strict naming convention.

--
Michael <mhall119@gmail.com>

On Sun, 2010-10-03 at 01:04 -0700, Andy wrote:
> I need to model many different product categories such as TV, laptops,
> women's apparel, men's shoes, etc.
>
> Since different product categories have different product attributes,
> each category has its own separate Model: TV, Laptop, WomensApparel,
> MensShoes, etc.
>
> And for each Model I created a ModelForm. Hence I have TVForm,
> LaptopForm, WomensApparelForm, MensShoesForm, etc.
>
> Users can enter product details by selecting a product category
> through multi-level drop-down boxes. Once a user has selected a
> product category, I need to display the corresponding product form.
>
> The obvious way to do this is to use a giant `if-elif` structure:
>
> # category is the product category selected by the user
> if category == "TV":
> form = TVForm()
> elif category == "Laptop":
> form = LaptopForm()
> elif category == "WomensApparel":
> form = WomensApparelForm()
> ...
>
> Unfortunately there could be hundreds if not more of categories. So
> the above method is going to be error-prone and tedious.
>
> Is there any way I could use the value of the variable `category` to
> directly select and initialize the appropriate `ModelForm` without
> resorting to a giant `if-elif` statement?
>
> Something like:
>
> # This doesn't work
> model_form_name = category + "Form"
> form = model_form_name()
>
> Is there any way to do this?
>

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