Django REST Framework and related models with one field - django

Question

I want to create a simple REST API for the following model:
I have a main entity called Product with some fields: name, price...
Also I have a related entity called Keyword with one single field: the keyword.
Each product can have one or more keywords.
I can easily translate this into two django models:
class Product(models.Model):
name = models.CharField("Name of the product", max_length=100)
description = models.TextField("Description of the product")
price = models.IntegerField("Price of the product")
received_at = models.DateField("Received at")
class Keyword(models.Model):
keyword = models.CharField(max_length=50)
product = models.ForeignKey(Product, related_name="keywords")
But I'm lost with serializers.
I want a simple verb like this to create:
POST /products
{
"name": "My product name",
"description": "My product description",
"price": 40,
"received_at": "2015-12-1",
"keywords": ["keyword1", "keyword2"]
}
And the common list all, list one, update and delete:
GET /products
[{"name": "Product 1"...}, {"name": "Product 2"...}]
GET /products/1
{"name": "Product 1", "description": ...}
PUT /products/1
{
"name": "My product name",
"description": "My product description",
"price": 40,
"received_at": "2015-12-1",
"keywords": ["keyword2"]
}
DELETE /products/1
The problem is manage the keywords.
When a new product is created all keywords are created
When a product is updated I have to check which keywords are news and which keywords have been deleted.
Also I want my API can be extensible in the near future with more relations like the "Keyword relation" with a simple string field.
Any ideas?

Answer 1

Try implementing the underlying keywords as members of a set. Then you can simply call the add method with each new keyword and the set will keep it a unique grouping, by the nature of how sets work.
a = set()
a.add('keyword1')
a.add('keyword2')
a.add('keyword1')
print(a)
Output:
set(['keyword1', 'keyword2'])