MP-Shop | Comparison

Installation:

1. Install using PIP:

pip install django-mp-shop-comparison

2. Add 'comparison' to INSTALLED_APPS.

3. Add 'comparison.middleware.ComparisonMiddleware' to MIDDLEWARE.

4. Add path('comparison/', include('comparison.urls')) to urlpatterns.

Template examples:

{% load comparison %}

{% if_product_in_comparison object.id %}
    <a href="{% url 'comparison:remove' product_id %}?next={{ request.get_full_path }}">
        Remove
    </a>
{% else %}
    <a href="{% url 'comparison:add' product_id %}?next={{ request.get_full_path }}">
        Add
    </a>
{% endif %}

{% if_product_in_comparison product_id %}
    Product in comparison
{% endif %}

There are {{ request.comparison|length }} products in comparison

{% if not request.comparison.is_empty %}
    <ul>
        {% for category in request.comparison.get_categories %}
            <li>
                <a href="{% url 'products:comparison' category.id %}">
                    {{ category.name }}
                </a>
            </li>
        {% endfor %}
    </ul>
{% endif %}

Product list example:

urls.py

path('comparison/<int:category_id>/', views.comparison, name='comparison')

views.py

def comparison(request, category_id):

    category = get_object_or_404(ProductCategory, id=category_id)

    products = request.comparison.get_products(category_id)

    context = {
        'category': category,
        'products': products,
        'attributes': _format_comparison_attrs(category, products)
    }
    return render(request, 'products/comparison.html', context)


def _format_comparison_attrs(category, products):

    attrs = []

    attributes = category.attributes.visible()

    values = {attr.id: {} for attr in attributes}

    for attr_val in ProductAttrValue.objects.filter(
            attr__in=attributes, product__in=products):

        values[attr_val.attr_id][attr_val.product_id] = attr_val.as_html()

    for attr in attributes:
        attrs.append({
            'name': attr.name,
            'values': [values[attr.id].get(p.id) for p in products]
        })

    return attrs

Public methods:

Products count:

len(request.comparison)

Add to comparison:

request.comparison.add(product)

Remove from comparison:

request.comparison.remove(product_id)

Clear comparison list:

request.comparison.clear()

Check is comparison list empty:

request.comparison.is_empty()

Get products from comparison:

request.comparison.get_products(category_id)

Check is product in comparison:

request.comparison.has_product(product_id)

Get categories of compare products

request.comparison.get_categories()

Requirements:

• django >= 2.0.6
• python >= 3.5.2