108 lines
3.4 KiB
JavaScript
108 lines
3.4 KiB
JavaScript
// # Recline Backends
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//
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// Backends are connectors to backend data sources and stores
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//
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// Backends are implemented as Backbone models but this is just a
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// convenience (they do not save or load themselves from any remote
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// source)
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this.recline = this.recline || {};
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this.recline.Backend = this.recline.Backend || {};
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(function($, my) {
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// ## BackendMemory - uses in-memory data
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//
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// This is very artificial and is really only designed for testing
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// purposes.
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//
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// To use it you should provide in your constructor data:
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//
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// * metadata (including fields array)
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// * documents: list of hashes, each hash being one doc. A doc *must* have an id attribute which is unique.
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//
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// Example:
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//
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// <pre>
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// // Backend setup
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// var backend = Backend();
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// backend.addDataset({
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// metadata: {
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// id: 'my-id',
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// title: 'My Title'
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// },
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// fields: [{id: 'x'}, {id: 'y'}, {id: 'z'}],
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// documents: [
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// {id: 0, x: 1, y: 2, z: 3},
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// {id: 1, x: 2, y: 4, z: 6}
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// ]
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// });
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// // later ...
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// var dataset = Dataset({id: 'my-id'});
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// dataset.fetch();
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// etc ...
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// </pre>
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my.BackendMemory = Backbone.Model.extend({
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initialize: function() {
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this.datasets = {};
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},
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addDataset: function(data) {
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this.datasets[data.metadata.id] = $.extend(true, {}, data);
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},
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sync: function(method, model, options) {
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var self = this;
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if (method === "read") {
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var dfd = $.Deferred();
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if (model.__type__ == 'Dataset') {
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var rawDataset = this.datasets[model.id];
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model.set(rawDataset.metadata);
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model.fields.reset(rawDataset.fields);
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model.docCount = rawDataset.documents.length;
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dfd.resolve(model);
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}
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return dfd.promise();
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} else if (method === 'update') {
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var dfd = $.Deferred();
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if (model.__type__ == 'Document') {
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_.each(self.datasets[model.dataset.id].documents, function(doc, idx) {
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if(doc.id === model.id) {
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self.datasets[model.dataset.id].documents[idx] = model.toJSON();
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}
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});
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dfd.resolve(model);
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}
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return dfd.promise();
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} else if (method === 'delete') {
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var dfd = $.Deferred();
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if (model.__type__ == 'Document') {
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var rawDataset = self.datasets[model.dataset.id];
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var newdocs = _.reject(rawDataset.documents, function(doc) {
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return (doc.id === model.id);
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});
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rawDataset.documents = newdocs;
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dfd.resolve(model);
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}
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return dfd.promise();
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} else {
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alert('Not supported: sync on BackendMemory with method ' + method + ' and model ' + model);
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}
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},
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query: function(model, queryObj) {
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var numRows = queryObj.size;
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var start = queryObj.offset;
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var dfd = $.Deferred();
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results = this.datasets[model.id].documents;
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// not complete sorting!
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_.each(queryObj.sort, function(item) {
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results = _.sortBy(results, function(doc) {
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var _out = doc[item[0]];
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return (item[1] == 'asc') ? _out : -1*_out;
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});
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});
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var results = results.slice(start, start+numRows);
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dfd.resolve(results);
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return dfd.promise();
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}
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});
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recline.Model.backends['memory'] = new my.BackendMemory();
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}(jQuery, this.recline.Backend));
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