The steps for building an API and serving dynamic content to mobile clients

1. Dynamic Plans
Connecting backend and mobile
Stockholm Python Meetup
Jun 16, 2016

2. About me
Ilian Iliev
Platform Engineer
ilian@lifesum.com
www.ilian.io

3. Plans - the next step towards healthy life

4. Feature requirements
● Multilingual support
● Different images based on the screen density
● Color fields
● Serialization
● Caching
● Administration

5. Multilingual support
Django Parler
class Plan(TranslatableModel):
detail_image = ScreenDensityImageField(upload_to='plans/detail_images')
translations = TranslatedFields(
title=models.CharField(max_length=255),
short_description=models.TextField(),
description=models.TextField(),
)

7. Different images based on screen density
● Our screen sizes : 1x, 1.5x, 2x, 3x
● Pixel perfect design
● Django Multiupload

8. Color fields
Django Colorful
class Plan(TranslatableModel):
start_color = RGBColorField()
end_color = RGBColorField()
content_color = RGBColorField()

10. Serialization
● DRF Serializers
● Different fields for list and detail
class PlanSerializer(ShortListSerializerMixin, serializers.ModelSerializer):
class Meta:
model = Plan
list_fields = ['id', 'title', 'short_description']
fields = list_fields + ['description']

11. Caching
● Per object caching
● Key attributes
○ Language
○ Screen Density
● Redis HSET
● Easy to invalidate

12. {
"plan_list_20" : {...},
"plan_list_14": {...},
"plan_detail_8": {
"en-3": "{"key": "value"}",
"de-2": "...",
"en-2": "...",
"sv-2": "...",
"sv-1": "...",
}

13. Administration

16. Questions?