question documentation - combination of stores memory/rest

[Jens-dojo]

Hello,

the documentation has really become very good. But I am struggling when it comes to combine stores.

I need

• store for use in dgrid ondemandgrid
• based on REST operations
• all data should (also) be completely hold in memory, so that sort and filtering are done locally.
  Fetch and get/put/delete/post done by REST.

What would be the correct combination?

declare( [Rest, RequestMemory, Trackable])

Thank you for your help!!

[dylans]

RequestMemory is really more of a one-time request and put into memory rather than a store with ongoing Rest operations. What you probably want is multiple stores, with a cache between them, similar to what was done in dojo/store. For example:

var restStore = declare( [Rest, Trackable] );
var cachedStore = Cache.create(restStore, {
    cachingStore: new Memory()
});

We should probably document this scenario better as its a common use case.

[dylans]

fwiw, this is documented somewhat at https://github.com/SitePen/dstore/blob/master/docs/Stores.md#cache . Please let us know if you have suggestions on how we might make this more obvious @Jens-dojo .

[Jens-dojo]

Dear Dylan,

thank you for the prompt reply!
If I use the Cache mixin with Rest store, then all the sort/filter operations trigger a new GET operation, something that seems problematic, as the data should already be in the Cache ?

[Jens-dojo]

suggestions on how we might make this more obvious

Proposals for "Cache Store Mixin" docs

• How does this internally work ? Is the original store changed, is it a second backup store ?
  Some words about the logic behind this mixin will help to undertstand and use it!

• what stores (all ? only some?) can use the cache mixin ?

• What do I have to do after initialising the store to get all data in it?

• Cache stores and filtering /sorting and REST

• Cache and Trackable (e.g. for dgrid): Something special I have to care about?
  Thank you!!

[denov]

@Jens-dojo did you get this sorted out? i can get caching to work but not tracking using declare([ Rest, Cache, SimpleQuery, Trackable ])

[Jens-dojo]

Hi,

I checked my source code (it is so long ago that I wrote it).

I have two combinations in my source code that I use. So these seem to work for me:
1)

define( [
		'dojo/_base/declare', 'dstore/Rest','dstore/Trackable','dstore/Cache'],
		function(declare,Rest,Trackable,Cache) {

	
	return declare([ Rest, Cache, Trackable ], {
		idProperty : 'uniqueid',
		
		postscript: function () {
			this.inherited(arguments);
			this.fetch();
		},
		
		isValidFetchCache: true
	});
	
	

} );

and
2)

define( [
		'dojo/_base/declare', 'dstore/RequestMemory',
		'dstore/Trackable'

], function(declare,RequestMemory,Trackable) {

	return declare( [
			RequestMemory, Trackable
	], {
		idProperty : 'uniqueid'
	} );

} );