Python Django Display Nested Objects - django

Question

Hi I'm new to django rest framework and I'm trying to serialize 3 nested models. The relationships are:
hotel_social_media_type has a one to many relationship to hotel_social_media
and hotel has one to many relationship to hotel_social_media. Right now I can only serialized hotel to hotel_social_media but I can't serialize hotel_social_media_type.
Here's my serializers:
class SocialMediaTypeSerializer(serializers.ModelSerializer):
"""Serializes social media type"""
class Meta:
model = models.SocialMediaType
fields = ('name', 'icon', 'url')
class HotelSocialMediaSerializer(serializers.ModelSerializer):
"""Serializes media files"""
hotel_social_media_type = SocialMediaTypeSerializer(many=False, read_only=True)
class Meta:
model = models.HotelSocialMedia
fields = ('url', 'hotel_social_media_type')
class HotelSerializer(serializers.ModelSerializer):
"""Serializes Restaurat, Bars, TouristInformation and Tourist Spots """
hotel_images = HotelImageSerializer(many=True, read_only=True)
hotel_social_media = HotelSocialMediaSerializer(many=True, read_only=True)
class Meta:
model = models.Hotel
fields = ('id', 'name', 'hotel_images', 'hotel_social_media')
Models:
class Hotel(models.Model):
"""Database model for hotels"""
name = models.CharField(max_length=50)
def __str__(self):
"""Return the model as a string"""
return self.name
class HotelImage(models.Model):
"""Image upload for hotel"""
name = models.CharField(max_length=50)
description = models.CharField(max_length=250)
path = models.ImageField(upload_to='images/')
created_on = models.DateTimeField(auto_now_add=True)
is_active = models.BooleanField(default=True)
hotel = models.ForeignKey(Hotel, related_name='hotel_images', on_delete=models.CASCADE, null=True)
def __str__(self):
"""Return the model as a string"""
return self.name
class SocialMediaType(models.Model):
"""Social Media Type eg: fb, twitter"""
name = models.CharField(max_length=50)
icon = models.ImageField(upload_to='images/')
url = models.CharField(max_length=50)
def __str__(self):
"""Return the model as a string"""
return self.name
class HotelSocialMedia(models.Model):
"""Social Media"""
hotel = models.ForeignKey(Hotel, related_name='hotel_social_media', on_delete=models.CASCADE, null=True)
type = models.ForeignKey(SocialMediaType, related_name='hotel_social_media_type', on_delete=models.CASCADE, null=True)
name = models.CharField(max_length=50)
url = models.CharField(max_length=50)
def __str__(self):
"""Return the model as a string"""
return self.name
Current result is:
{
"id": 1,
"name": "Alta Vista",
"hotel_images": [
{
"id": 1,
"name": "Alta Vista",
"path": "http://127.0.0.1:8000/media/images/hotel-1.jpg"
}
],
"hotel_social_media": [
{
"url": "https://www.facebook.com/abscbnNEWS"
}
]
}
What I want is:
{
"id": 1,
"name": "Alta Vista",
"hotel_images": [
{
"id": 1,
"name": "Alta Vista",
"path": "http://127.0.0.1:8000/media/images/hotel-1.jpg"
}
],
"hotel_social_media": [
{
"url": "https://www.facebook.com/abscbnNEWS",
"hotel_social_media_type": {
"name": "Facebook",
"icon": "http://127.0.0.1:8000/media/images/fb-1.jpg"
}
}
]
}
`hotel_social_media` must also display `hotel_social_media_type`

Answer 1

Based on your model, you must use type keyword instead of hotel_social_media_type in your HotelSocialMediaSerializer. Because your HotelSocialMedia has type field for relation with HotelSocialMediaType.To change keyword can solve your problem.
class HotelSocialMediaSerializer(serializers.ModelSerializer):
"""Serializes media files"""
type = SocialMediaTypeSerializer(many=False, read_only=True)
class Meta:
model = models.HotelSocialMedia
fields = ('url', 'type')
If you want to use hotel_social_media_type keyword, you can use SerializerMethodField like that:
class HotelSocialMediaSerializer(serializers.ModelSerializer):
"""Serializes media files"""
hotel_social_media_type = serializers.SerializerMethodField()
class Meta:
model = models.HotelSocialMedia
fields = ('url', 'hotel_social_media_type')
def get_hotel_social_media_type(self.obj):
serializer = SocialMediaTypeSerializer(obj.type)
return serializer.data