diff --git a/registrasion/forms.py b/registrasion/forms.py index 68302f5624e3cdcf5d17320383a895ef7492e1f7..552ea991638efc0292223137276a8aca06b8ef15 100644 --- a/registrasion/forms.py +++ b/registrasion/forms.py @@ -2,6 +2,7 @@ from registrasion.models import commerce from registrasion.models import inventory from django import forms +from django.core.exceptions import ValidationError class ApplyCreditNoteForm(forms.Form): @@ -45,9 +46,36 @@ class ManualPaymentForm(forms.ModelForm): # Products forms -- none of these have any fields: they are to be subclassed -# and the fields added as needs be. +# and the fields added as needs be. ProductsForm (the function) is responsible +# for the subclassing. -class _ProductsForm(forms.Form): +def ProductsForm(category, products): + ''' Produces an appropriate _ProductsForm subclass for the given render + type. ''' + + # Each Category.RENDER_TYPE value has a subclass here. + RENDER_TYPES = { + inventory.Category.RENDER_TYPE_QUANTITY: _QuantityBoxProductsForm, + inventory.Category.RENDER_TYPE_RADIO: _RadioButtonProductsForm, + inventory.Category.RENDER_TYPE_ITEM_QUANTITY: _ItemQuantityProductsForm, + } + + # Produce a subclass of _ProductsForm which we can alter the base_fields on + class ProductsForm(RENDER_TYPES[category.render_type]): + pass + + ProductsForm.set_fields(category, products) + + if category.render_type == inventory.Category.RENDER_TYPE_ITEM_QUANTITY: + ProductsForm = forms.formset_factory( + ProductsForm, + formset=_ItemQuantityProductsFormSet, + ) + + return ProductsForm + + +class _HasProductsFields(object): PRODUCT_PREFIX = "product_" @@ -57,7 +85,7 @@ class _ProductsForm(forms.Form): initial = self.initial_data(k["product_quantities"]) k["initial"] = initial del k["product_quantities"] - super(_ProductsForm, self).__init__(*a, **k) + super(_HasProductsFields, self).__init__(*a, **k) @classmethod def field_name(cls, product): @@ -80,6 +108,22 @@ class _ProductsForm(forms.Form): cleaned form data. ''' return iter([]) + def add_product_error(self, product, error): + ''' Adds an error to the given product's field ''' + + ''' if product in field_names: + field = field_names[product] + elif isinstance(product, inventory.Product): + return + else: + field = None ''' + + self.add_error(self.field_name(product), error) + + +class _ProductsForm(_HasProductsFields, forms.Form): + pass + class _QuantityBoxProductsForm(_ProductsForm): ''' Products entry form that allows users to enter quantities @@ -116,7 +160,7 @@ class _QuantityBoxProductsForm(_ProductsForm): for name, value in self.cleaned_data.items(): if name.startswith(self.PRODUCT_PREFIX): product_id = int(name[len(self.PRODUCT_PREFIX):]) - yield (product_id, value, name) + yield (product_id, value) class _RadioButtonProductsForm(_ProductsForm): @@ -129,7 +173,6 @@ class _RadioButtonProductsForm(_ProductsForm): def set_fields(cls, category, products): choices = [] for product in products: - choice_text = "%s -- $%d" % (product.name, product.price) choices.append((product.id, choice_text)) @@ -167,23 +210,133 @@ class _RadioButtonProductsForm(_ProductsForm): self.FIELD, ) + def add_product_error(self, product, error): + self.add_error(cls.FIELD, error) -def ProductsForm(category, products): - ''' Produces an appropriate _ProductsForm subclass for the given render - type. ''' +class _ItemQuantityProductsForm(_ProductsForm): + ''' Products entry form that allows users to select a product type, and + enter a quantity of that product. This version _only_ allows a single + product type to be purchased. This form is usually used in concert with the + _ItemQuantityProductsFormSet to allow selection of multiple products.''' - # Each Category.RENDER_TYPE value has a subclass here. - RENDER_TYPES = { - inventory.Category.RENDER_TYPE_QUANTITY: _QuantityBoxProductsForm, - inventory.Category.RENDER_TYPE_RADIO: _RadioButtonProductsForm, - } + CHOICE_FIELD = "choice" + QUANTITY_FIELD = "quantity" - # Produce a subclass of _ProductsForm which we can alter the base_fields on - class ProductsForm(RENDER_TYPES[category.render_type]): - pass + @classmethod + def set_fields(cls, category, products): + choices = [] - ProductsForm.set_fields(category, products) - return ProductsForm + if not category.required: + choices.append((0, "---")) + + for product in products: + choice_text = "%s -- $%d each" % (product.name, product.price) + choices.append((product.id, choice_text)) + + cls.base_fields[cls.CHOICE_FIELD] = forms.TypedChoiceField( + label=category.name, + widget=forms.Select, + choices=choices, + initial=0, + empty_value=0, + coerce=int, + ) + + cls.base_fields[cls.QUANTITY_FIELD] = forms.IntegerField( + label="Quantity", # TODO: internationalise + min_value=0, + max_value=500, # Issue #19. We should figure out real limit. + ) + + @classmethod + def initial_data(cls, product_quantities): + initial = {} + + for product, quantity in product_quantities: + if quantity > 0: + initial[cls.CHOICE_FIELD] = product.id + initial[cls.QUANTITY_FIELD] = quantity + break + + return initial + + def product_quantities(self): + our_choice = self.cleaned_data[self.CHOICE_FIELD] + our_quantity = self.cleaned_data[self.QUANTITY_FIELD] + choices = self.fields[self.CHOICE_FIELD].choices + for choice_value, choice_display in choices: + if choice_value == 0: + continue + yield ( + choice_value, + our_quantity if our_choice == choice_value else 0, + ) + + def add_product_error(self, product, error): + if self.CHOICE_FIELD not in self.cleaned_data: + return + + if product.id == self.cleaned_data[self.CHOICE_FIELD]: + self.add_error(self.CHOICE_FIELD, error) + self.add_error(self.QUANTITY_FIELD, error) + + +class _ItemQuantityProductsFormSet(_HasProductsFields, forms.BaseFormSet): + + @classmethod + def set_fields(cls, category, products): + raise ValueError("set_fields must be called on the underlying Form") + + @classmethod + def initial_data(cls, product_quantities): + ''' Prepares initial data for an instance of this form. + product_quantities is a sequence of (product,quantity) tuples ''' + + f = [ + { + _ItemQuantityProductsForm.CHOICE_FIELD: product.id, + _ItemQuantityProductsForm.QUANTITY_FIELD: quantity, + } + for product, quantity in product_quantities + if quantity > 0 + ] + return f + + def product_quantities(self): + ''' Yields a sequence of (product, quantity) tuples from the + cleaned form data. ''' + + products = set() + # Track everything so that we can yield some zeroes + all_products = set() + + for form in self: + if form.empty_permitted and not form.cleaned_data: + # This is the magical empty form at the end of the list. + continue + + for product, quantity in form.product_quantities(): + all_products.add(product) + if quantity == 0: + continue + if product in products: + form.add_error( + _ItemQuantityProductsForm.CHOICE_FIELD, + "You may only choose each product type once.", + ) + form.add_error( + _ItemQuantityProductsForm.QUANTITY_FIELD, + "You may only choose each product type once.", + ) + products.add(product) + yield product, quantity + + for product in (all_products - products): + yield product, 0 + + def add_product_error(self, product, error): + for form in self.forms: + form.add_product_error(product, error) class VoucherForm(forms.Form):