Support Multiple Algolia applications in one Django project

[ademidun]

Description

Support indexing models in multiple applications with different APPLICATION_ID and API_KEY settings on a per-model basis while preserving the native register and hooks integration.

• Django version: 1.11
• Algolia Django integration version: 2.0.0
• Algolia Client Version: 2.6.1
• Language Version: Python 3.9

How this could work

Subclass AlgoliaEngine or modify the @register decorator. Not really show how the implementation details would work but here is some pseudocode to convey the general idea.

class ScholarshipAlgoliaEngine(AlgoliaEngine)

	scholarship_algolia_settings = {
		**settings.ALGOLIA,
		'APPLICATION_ID': env['SCHOLARSHIP_ALGOLIA_APPLICATION_ID'],
		'API_KEY': env['SCHOLARSHIP_ALGOLIA_API_KEY'],
	}
	def __init__(self, settings=scholarship_algolia_settings, *args, **kwargs):
		super().__init__(self, settings=settings, *args, **kwargs) # args and kwargs not needed but maybe for backwards-compatibility?

@register(Scholarship, ScholarshipAlgoliaEngine)
class ScholarshipIndex(AlgoliaIndex):
    pass
# OR

@register(Scholarship)
class ScholarshipIndex(AlgoliaIndex, ScholarshipAlgoliaEngine):
    pass

# OR

custom_engine = ScholarshipAlgoliaEngine()

@custom_engine.register(Scholarship)
class ScholarshipIndex(AlgoliaIndex):
    pass

Sources

Based on registration.py:

algoliasearch-django/algoliasearch_django/registration.py

Lines 28 to 33 in e192aec

	class AlgoliaEngine(object):
	def __init__(self, settings=SETTINGS):
	"""Initializes the Algolia engine."""
	try:
	app_id = settings['APPLICATION_ID']

and Algolia engine:

algoliasearch-django/algoliasearch_django/__init__.py

Lines 16 to 22 in e192aec

	AlgoliaIndex = models.AlgoliaIndex
	AlgoliaEngine = registration.AlgoliaEngine
	algolia_engine = registration.algolia_engine
	# Algolia Engine functions
	register = algolia_engine.register

Another idea for how to implement this

@register(Scholarship)
class ScholarshipIndex(AlgoliaIndex):
    APPLICATION_ID = env['SCHOLARSHIP_ALGOLIA_APPLICATION_ID'] # <-- new field
    API_KEY = env['SCHOLARSHIP_ALGOLIA_API_KEY'] # <-- new field
    fields = SCHOLARSHIP_FIELDS_FOR_INDEXING
    settings = {'searchableAttributes': SCHOLARSHIP_FIELDS_FOR_SEARCHING,
                'customRanking': [
                    'desc(deadline_score)',
                ]}
    index_name = 'scholarship_index'
    should_index = 'can_be_indexed'

Any models that don't have APPLICATION_ID or API_KEY provided would use the default settings in settings.py:

@register(Scholarship)
class ScholarshipIndex(AlgoliaIndex):
    fields = SCHOLARSHIP_FIELDS_FOR_INDEXING
    settings = {'searchableAttributes': SCHOLARSHIP_FIELDS_FOR_SEARCHING,
                'customRanking': [
                    'desc(deadline_score)',
                ]}
    index_name = 'scholarship_index'
    should_index = 'can_be_indexed'