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[#49,query][s]: introduce Query model object and use it in Dataset.

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* tests: refactor Memory backend tests so that tests are independent (to avoid issues of carry over of query state)
* TODO: use query stuff in views - NB sorting seems broken in DataTable.
This commit is contained in:
Rufus Pollock
2012-02-17 23:05:34 +00:00
parent 7fa2517450
commit 866ad12a15
2 changed files with 95 additions and 71 deletions
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33
src/model.js
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@@ -13,37 +13,31 @@ this.recline.Model = this.recline.Model || {};
my.Dataset = Backbone.Model.extend({
__type__: 'Dataset',
initialize: function(model, backend) {
_.bindAll(this, 'query');
this.backend = backend;
if (backend && backend.constructor == String) {
this.backend = my.backends[backend];
}
this.currentDocuments = new my.DocumentList();
this.docCount = null;
this.defaultQuery = {
size: 100
, offset: 0
};
// this.queryState = {};
this.queryState = new my.Query();
this.queryState.bind('change', this.query);
},
// ### getDocuments
// ### query
//
// AJAX method with promise API to get rows (documents) from the backend.
// AJAX method with promise API to get documents from the backend.
//
// It will query based on current query state (given by this.queryState)
// updated by queryObj (if provided).
//
// Resulting DocumentList are used to reset this.currentDocuments and are
// also returned.
//
// :param numRows: passed onto backend getDocuments.
// :param start: passed onto backend getDocuments.
//
// this does not fit very well with Backbone setup. Backbone really expects you to know the ids of objects your are fetching (which you do in classic RESTful ajax-y world). But this paradigm does not fill well with data set up we have here.
// This also illustrates the limitations of separating the Dataset and the Backend
query: function(queryObj) {
var self = this;
this.queryState = queryObj || this.defaultQuery;
this.queryState = _.extend({size: 100, offset: 0}, this.queryState);
this.queryState.set(queryObj, {silent: true});
var dfd = $.Deferred();
this.backend.query(this, this.queryState).done(function(rows) {
this.backend.query(this, this.queryState.toJSON()).done(function(rows) {
var docs = _.map(rows, function(row) {
var _doc = new my.Document(row);
_doc.backend = self.backend;
@@ -79,6 +73,13 @@ my.DocumentList = Backbone.Collection.extend({
model: my.Document
});
my.Query = Backbone.Model.extend({
defaults: {
size: 100
, offset: 0
}
});
// ## Backend registry
//
// Backends will register themselves by id into this registry