Products catalogue: filter by parameters

2018-06-13 13:33:09

I need to make the filter products by features.

So, products model:



class Product(models.Model):
    name = models.CharField(max_length=255, unique=True')

And feature models:



class Value(models.Model):
    value = models.CharField(max_length=50)

class FeatureName(models.Model):
    name = models.CharField(max_length=50)

class Feature(models.Model):
    name = models.ForeignKey(FeatureName)
    value = models.ForeignKey(Value)
    item = models.ForeignKey(Product)

To mark up a template form of filtering I need to get all the possible names of the characteristics and values of this characteristic.

Like this:

Color: Red, White, Blue Size: 1, 2, 3

I hope somebody understood me, tell me how to do clever to realize a functional. Thanks:)

Start with listing all Features for given product:

product = Product.objects.get(pk=given_pk)
features = product.feature_set.all().select_related()

Now group your features directly in Python.

features_dict = {}
for feature in features:
    values = features_dict.get(feature.name.name, [])
    features_dict[feature.name.name] = values + [feature.value.value]

That will give you dict linking all name to it's existing values.

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