Realtime datastore in google datastore
I want to store some information about shops and sellers including catalogs in google cloud datastore. One initial architecture i can think of is (shop_info is a kind) /shop_owner_info /shop_info /shop_info/catalog/item(x) But the problem here is as the catalog is in same group the write is limited to 1 per sec. But there might me more than one update to catalog per second. So my question is how can the above be structured so that i can get realtime updates to catalog.
Use Namespaces, not Ancestor paths What you need is a Multitenant structure. In Datastore, you do that by using Namespaces, not ancestor paths. See Multitenancy in Datastore docs. Instead of /shop_info/catalog/item(x), you would have: Entities: owner owner/shop (I suggest shop as a child of owner) catalog_item (top-level, not child of shop) Namespaces: [shop name or ID] Example: Let's say John subscribes to your app and creates a 'SuperElectro' store. You would have two entities: owner: 'John' shop: 'SuperElectro' (could be a child of owner: 'John') And one namespace: SuperElectro (or its unique ID) When you add a new item to SuperElecto's catalog, don't provide any ancestor/parent. Instead, provide a namespace which is a combination of the owner and shop: In Python: from google.appengine.api import namespace_manager from google.appengine.ext import ndb class CatalogItem(ndb.Model): name = ndb.StringProperty() category = ndb.StringProperty() namespace_manager.set_namespace('SuperElectro') item = CatalogItem(name='iPhone', category='Smartphone') item.put() In real world, you'd want to use something unique for the namespace: instead of 'SuperElectro', I'd suggest using the shop ID. Hope it helps. Read more at Implementing Multitenancy Using Namespaces.
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