crispy_forms_tags.py 文件源码

def get_render(self, context):
        """
        Returns a `Context` object with all the necesarry stuff for rendering the form

        :param context: `django.template.Context` variable holding the context for the node

        `self.form` and `self.helper` are resolved into real Python objects resolving them
        from the `context`. The `actual_form` can be a form or a formset. If it's a formset
        `is_formset` is set to True. If the helper has a layout we use it, for rendering the
        form or the formset's forms.
        """
        # Nodes are not thread safe in multithreaded environments
        # https://docs.djangoproject.com/en/dev/howto/custom-template-tags/#thread-safety-considerations
        if self not in context.render_context:
            context.render_context[self] = (
                template.Variable(self.form),
                template.Variable(self.helper) if self.helper else None
            )
        form, helper = context.render_context[self]

        actual_form = form.resolve(context)
        if self.helper is not None:
            helper = helper.resolve(context)
        else:
            # If the user names the helper within the form `helper` (standard), we use it
            # This allows us to have simplified tag syntax: {% crispy form %}
            helper = FormHelper() if not hasattr(actual_form, 'helper') else actual_form.helper

        self.actual_helper = helper

        # We get the response dictionary
        is_formset = isinstance(actual_form, BaseFormSet)
        response_dict = self.get_response_dict(helper, context, is_formset)
        node_context = copy_context(context)
        node_context.update(response_dict)

        # If we have a helper's layout we use it, for the form or the formset's forms
        if helper and helper.layout:
            if not is_formset:
                actual_form.form_html = helper.render_layout(actual_form, node_context, template_pack=self.template_pack)
            else:
                forloop = ForLoopSimulator(actual_form)
                helper.render_hidden_fields = True
                for form in actual_form:
                    node_context.update({'forloop': forloop})
                    form.form_html = helper.render_layout(form, node_context, template_pack=self.template_pack)
                    forloop.iterate()

        if is_formset:
            response_dict.update({'formset': actual_form})
        else:
            response_dict.update({'form': actual_form})

        return Context(response_dict)