Django OfferMaker

django-offermaker library is a solution for Django applications, which allows to create multi variant offers and use them on your site.

Multi variant offer is a structure which defines dependencies between values for given set of fields.

Eg. for the fields credit contribution and number of instalments we have the following dependencies:

• for 0% credit contribution, it is required to have maximum 12 instalments,
• for 10%+ contribution, it is allowed to have 12-24 instalments,
• and for 20%+ contribution, it is allowed to have 12-36 instalments.

Functions of django-offermaker

• Create and edit multi variant offer by using Offermaker Admin Editor.
• Display multi variant offer in tabular way by using Offermaker Template Tag.
• Display form which dynamically adjusts to user filled values based on multi variant offer by using OfferMakerFormView Generic View.
• Make decision which variant of multi variant offer is suitable for given parameters by using decide helper.

Changelog

• 0.9.8

  • Selenium test for offermaker admin editor and offermaker form and bug fixes in supported Django and Python versions.

• 0.9.7

  • Added Class Based View for offermaker form
  • Added decide() method

• 0.9.5

  • Small bug fixes

• 0.9.4

  • Django 1.7 support
  • Python 3 support

Support

• Environments: Python 2.6, Python 2.7, Python 3.2, Python 3.3, Python 3.4, PyPy,
• Django versions: Django 1.5, Django 1.6, Django 1.7 (Python 2.6 is not supported),

Demo application

1. You can check it online http://offermaker.kjw.pt

2. Or checkout and install locally:

   git clone git@github.com:kkujawinski/django-offermaker-demo.git
   

Quick start

1. Install django-offermaker

   pip install django-offermaker
   

2. Site configuration in settings.py

   INSTALLED_APPS = (
       ...
       'offermaker',
   )
   

3. Create Django form with needed fields:

   from django import forms
   
   class MyForm(forms.Form):
       product = forms.ChoiceField(
           label='Product',
           choices=(
               ('', '---'), ('PROD1', 'Product X'), ('PROD2', 'Product Y'), ('PROD3', 'Product Z'),
           ),
           required=False)
       crediting_period = forms.ChoiceField(
           label='Crediting period',
           choices=(('', '---'), ('12', '12'), ('24', '24'), ('36', '36'), ('48', '48')))
       interest_rate = forms.FloatField(label='Interest rate', min_value=1, max_value=5)
       contribution = forms.FloatField(label='Contribution', min_value=0)
   
       # # Uncomment for Django 1.5
       # def __init__(self, *args, **kwargs):
       #     super(MyForm, self).__init__(*args, **kwargs)
       #     self.fields['interest_rate'].widget.attrs['data-om-type'] = 'number'
       #     self.fields['interest_rate'].widget.attrs['data-om-min'] = 1
       #     self.fields['interest_rate'].widget.attrs['data-om-max'] = 5
       #     self.fields['contribution'].widget.attrs['data-om-type'] = 'number'
       #     self.fields['contribution'].widget.attrs['data-om-min'] = 0
   

4. Define your offer (in case you do not store it in database):

   offer = {
       'params': {},
       'variants': [[
           {
               'params': {
                   'crediting_period': ['24'],
                   'product': ['PROD1']
               }
           }, {
               'params': {
                   'crediting_period': ['12', '36', '48'],
                   'product': ['PROD2']
               }
           }, {
               'params': {
                   'product': ['PROD3']
               }
           }
       ], [
           {
               'params': {
                   'contribution': [[10, 20]],
                   'interest_rate': [[2, 2]],
                   'product': ['PROD1']
               }
           }, {
               'params': {
                   'contribution': [[30, 40]],
                   'interest_rate': [[4, 4]],
                   'product': ['PROD1']
               }
           }, {
               'params': {
                   'contribution': [[30, 70]],
                   'interest_rate': [[5, 5]],
                   'product': ['PROD2', 'PROD3']
               }
           }
       ]]
   }
   

5. Offer form:

1. Use dispatcher code in Django view

   import offermaker
   
   class MyOfferFormView(offermaker.OfferMakerFormView):
       form_class = MyForm
       offermaker_offer = offer
       template_name = 'my_offer_form_view.html'
   
   my_offer_form_view = MyOfferFormView.as_view()
   

2. Initialize offerform in template

   <head>
   {% load offermaker %}
   <script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
   {% offermaker_javascript %}
   </head>
   
   <body>
   
   <form action="?" method="post" id="offer_form">
       <div class="alert-placeholder" style="height: 30px;"></div>
       {% csrf_token %}
       {{ form.as_p }}
       <button type="submit">Submit</button>
   </form>
   
   
   <script type="text/javascript">
       (function() {
           $('#offer_form').offer_form();
       })();
   </script>
   

6. Offer preview with Offermaker Template Tag

1. Pass offer form object from view to template:

   class MyOfferPreviewView(TemplateView):
       template_name = 'offer_preview.html'
   
       def get_context_data(self):
           output = super(MyOfferPreviewView, self).get_context_data()
           output['offer'] = offermaker.OfferMakerCore(MyForm, offer)
           return output
   

2. Use proper template tag in template to print table:

   {% load offermaker %}
   
   {% offermaker_preview offer %}
   

7. Offermaker Admin Editor:

1. Use OfferJSONField field in your model. Remember to pass your django form created in 3.:

   import offermaker
   
   class MyOfferMakerField(offermaker.OfferJSONField):
       form_object = MyForm()
   
   class MyOffer(models.Model):
       id = models.AutoField(primary_key=True)
       name = models.CharField(max_length=30)
       offer = MyOfferMakerField()
   

2. Create your own Admin Site for model:

   import models
   
   class OfferAdmin(admin.ModelAdmin):
       list_display = ('name',)
       search_fields = ('name', 'user')
       fields = ('name', 'offer')
   
       # # Uncomment for Django 1.5
       # class Media:
       #     js = ('//code.jquery.com/jquery-1.11.0.min.js',)
   
   
   admin.site.register(models.Offer, OfferAdmin)
   

7. Decide helper:

   core_object = offermaker.OfferMakerCore(MyForm, offer)
   
   result = core_object.decide({'crediting_period': 24})
   print(result['product'].items)
   # frozenset({'PROD1', 'PROD3'})
   print(result['interest_rate'].ranges)
   # frozenset({(4, 4), (5, 5), (2, 2)})
   print(result['contribution'].ranges)
   # frozenset({(10, 20), (30, 70)})
   
   result = core_object.decide({'crediting_period': 24, 'interest_rate': 2})
   print(result['product'].fixed)
   # PROD1
   

Basic customization

1. Using offers stored in database:

1. you need to pass proper offer object to Offermaker in form/preview view:

   offer = MyOffer.objects.filter(id=request.GET['id']).first()
   core_object = offermaker.OfferMakerCore(MyForm, offer.offer)
   

2. and configure proper params to be used in ajax requests:

   $('#offer_form').offer_form({
       ajax_extra_params: function(params) {
           return { id: {{ request.GET.id }} };
       },
   });
   

2. Substituting builtin formatters for infotip and error alerts:

   $('#offer_form').offer_form({
       error_alert_factory: function (msg) {
           var $error = $('<p class="error"><span>' + msg + '</span></p>');
           $('.alert-placeholder', $form).append($error);
           return $error;
       },
       tooltip_factory: function ($field, msg) {
           var $tooltip = $('<p class="infotip">' + msg + '</p>');
           $field.parent().append($tooltip);
           return $tooltip;
       }
   });
   

3. Use builtin formatters for Twitter Bootstap3:

   (function() {
       $('#offer_form').offer_form({
           bootstrap3: true,
       });
   })();
   

4. Customizing messages:

   (function() {
       $('#offer_form').offer_form({
           msgs: {
               'NO_VARIANTS': 'No matching variants',
               'INFO_ITEMS': 'Available values are: %s.',
               'INFO_FIXED': 'Only available value is %s.',
               'RANGE_left': 'to %2$s',
               'RANGE_right': 'from %1$s',
               'RANGE_both': 'from %1$s to %2$s',
               'AND': ' and '
           },
           iteration_str: function (items) {
               return items.slice(0, -2).concat(items.slice(-2).join(msgs.AND)).join(', ');
           }
       });
   })();
   

5. Creating preview table for certain fields:

   {% offermaker_preview offer fields='product, crediting_period' %}
   

6. Add html attributes to generated preview table:

   {% offermaker_preview offer class='table table-bordered' %}