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[#43,model][m]: refactor Dataset and BackendMemory to the new setup approach.

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* NB: other model tests broken as a result.
This commit is contained in:
Rufus Pollock 2012-02-17 08:53:36 +00:00
parent 57effa02aa
commit 2d4e6a2ecc
3 changed files with 87 additions and 77 deletions
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93
src/backend.js
View File

@ -9,13 +9,11 @@ this.recline = this.recline || {};
this.recline.Model = this.recline.Model || {};
(function($, my) {
my.backends = {};
// ## Backbone.sync
//
// Override Backbone.sync to hand off to sync function in relevant backend
Backbone.sync = function(method, model, options) {
return my.backends[model.backendConfig.type].sync(method, model, options);
return model.backend.sync(method, model, options);
}
// ## wrapInTimeout
@ -45,49 +43,59 @@ this.recline.Model = this.recline.Model || {};
// ## BackendMemory - uses in-memory data
//
// To use you should:
// This is very artificial and is really only designed for testing
// purposes.
//
// To use it you should provide in your constructor data:
//
// A. provide metadata as model data to the Dataset
// * metadata (including headers array)
// * documents: list of hashes, each hash being one doc. A doc *must* have an id attribute which is unique.
//
// B. Set backendConfig on your dataset with attributes:
//
// - type: 'memory'
// - data: hash with 2 keys:
//
// * headers: list of header names/labels
// * rows: list of hashes, each hash being one row. A row *must* have an id attribute which is unique.
//
// Example of data:
// Example:
//
// <pre>
// {
// headers: ['x', 'y', 'z']
// , rows: [
// {id: 0, x: 1, y: 2, z: 3}
// , {id: 1, x: 2, y: 4, z: 6}
// ]
// };
// // Backend setup
// var backend = Backend();
// backend.addDataset({
// metadata: {
// id: 'my-id',
// title: 'My Title',
// headers: ['x', 'y', 'z'],
// },
// documents: [
// {id: 0, x: 1, y: 2, z: 3},
// {id: 1, x: 2, y: 4, z: 6}
// ]
// });
// // later ...
// var dataset = Dataset({id: 'my-id'});
// dataset.fetch();
// etc ...
// </pre>
my.BackendMemory = Backbone.Model.extend({
initialize: function() {
this.datasets = {};
},
addDataset: function(data) {
this.datasets[data.metadata.id] = $.extend(true, {}, data);
},
sync: function(method, model, options) {
var self = this;
if (method === "read") {
var dfd = $.Deferred();
if (model.__type__ == 'Dataset') {
var dataset = model;
dataset.set({
headers: dataset.backendConfig.data.headers
});
dataset.docCount = dataset.backendConfig.data.rows.length;
dfd.resolve(dataset);
var rawDataset = this.datasets[model.id];
model.set(rawDataset.metadata);
model.docCount = rawDataset.documents.length;
dfd.resolve(model);
}
return dfd.promise();
} else if (method === 'update') {
var dfd = $.Deferred();
if (model.__type__ == 'Document') {
_.each(model.backendConfig.data.rows, function(row, idx) {
if(row.id === model.id) {
model.backendConfig.data.rows[idx] = model.toJSON();
_.each(self.datasets[model.dataset.id].documents, function(doc, idx) {
if(doc.id === model.id) {
self.datasets[model.dataset.id].documents[idx] = model.toJSON();
}
});
dfd.resolve(model);
@ -96,9 +104,11 @@ this.recline.Model = this.recline.Model || {};
} else if (method === 'delete') {
var dfd = $.Deferred();
if (model.__type__ == 'Document') {
model.backendConfig.data.rows = _.reject(model.backendConfig.data.rows, function(row) {
return (row.id === model.id);
var rawDataset = self.datasets[model.dataset.id];
var newdocs = _.reject(rawDataset.documents, function(doc) {
return (doc.id === model.id);
});
rawDataset.documents = newdocs;
dfd.resolve(model);
}
return dfd.promise();
@ -110,11 +120,11 @@ this.recline.Model = this.recline.Model || {};
var numRows = queryObj.size;
var start = queryObj.offset;
var dfd = $.Deferred();
results = model.backendConfig.data.rows;
results = this.datasets[model.id].documents;
// not complete sorting!
_.each(queryObj.sort, function(item) {
results = _.sortBy(results, function(row) {
var _out = row[item[0]];
results = _.sortBy(results, function(doc) {
var _out = doc[item[0]];
return (item[1] == 'asc') ? _out : -1*_out;
});
});
@ -129,14 +139,7 @@ this.recline.Model = this.recline.Model || {};
//
// Connecting to [Webstores](http://github.com/okfn/webstore)
//
// To use this backend set backendConfig on your Dataset as:
//
// <pre>
// {
// 'type': 'webstore',
// 'url': url to relevant Webstore table
// }
// </pre>
// To use this backend ensure your Dataset has a webstore_url in its attributes.
my.BackendWebstore = Backbone.Model.extend({
sync: function(method, model, options) {
if (method === "read") {
@ -256,10 +259,10 @@ this.recline.Model = this.recline.Model || {};
});
var dfd = $.Deferred();
jqxhr.done(function(results) {
var _out = _.map(results.data, function(row) {
var _out = _.map(results.data, function(doc) {
var tmp = {};
_.each(results.fields, function(key, idx) {
tmp[key] = row[idx];
tmp[key] = doc[idx];
});
return tmp;
});

21
src/model.js
View File

@ -11,11 +11,13 @@ this.recline.Model = this.recline.Model || {};
// * docCount: total number of documents in this dataset (obtained on a fetch for this Dataset)
my.Dataset = Backbone.Model.extend({
__type__: 'Dataset',
initialize: function(options) {
console.log(options);
initialize: function(model, backend) {
this.backend = backend;
if (backend && backend.constructor == String) {
this.backend = my.backends[backend];
}
this.currentDocuments = new my.DocumentList();
this.docCount = null;
this.backend = null;
this.defaultQuery = {
size: 100
, offset: 0
@ -37,15 +39,14 @@ this.recline.Model = this.recline.Model || {};
// This also illustrates the limitations of separating the Dataset and the Backend
query: function(queryObj) {
var self = this;
var backend = my.backends[this.backendConfig.type];
this.queryState = queryObj || this.defaultQuery;
this.queryState = _.extend({size: 100, offset: 0}, this.queryState);
var dfd = $.Deferred();
backend.query(this, this.queryState).done(function(rows) {
this.backend.query(this, this.queryState).done(function(rows) {
var docs = _.map(rows, function(row) {
var _doc = new my.Document(row);
_doc.backendConfig = self.backendConfig;
_doc.backend = backend;
_doc.backend = self.backend;
_doc.dataset = self;
return _doc;
});
self.currentDocuments.reset(docs);
@ -76,5 +77,11 @@ this.recline.Model = this.recline.Model || {};
__type__: 'DocumentList',
model: my.Document
});
// ## Backend registry
//
// Backends will register themselves by id into this registry
my.backends = {};
}(jQuery, this.recline.Model));

50
test/model.test.js
View File

@ -1,41 +1,41 @@
(function ($) {
module("Dataset");
test('new Dataset', function () {
test('Memory Backend', function () {
var datasetId = 'test-dataset';
var metadata = {
title: 'My Test Dataset'
, name: '1-my-test-dataset'
, id: datasetId
};
var indata = {
headers: ['x', 'y', 'z']
, rows: [
var inData = {
metadata: {
title: 'My Test Dataset'
, name: '1-my-test-dataset'
, id: datasetId
, headers: ['x', 'y', 'z']
},
documents: [
{id: 0, x: 1, y: 2, z: 3}
, {id: 1, x: 2, y: 4, z: 6}
, {id: 2, x: 3, y: 6, z: 9}
, {id: 3, x: 4, y: 8, z: 12}
, {id: 4, x: 5, y: 10, z: 15}
, {id: 5, x: 6, y: 12, z: 18}
]
};
var dataset = new recline.Model.Dataset(metadata);
dataset.backendConfig = {
type: 'memory'
// deep copy so we do not touch original data ...
, data: $.extend(true, {}, indata)
]
};
var backend = new recline.Model.BackendMemory();
backend.addDataset(inData);
var dataset = new recline.Model.Dataset({id: datasetId}, backend);
// ### Start testing
expect(10);
dataset.fetch().then(function(dataset) {
equal(dataset.get('name'), metadata.name);
deepEqual(dataset.get('headers'), indata.headers);
// convenience for tests
var data = backend.datasets[datasetId];
dataset.fetch().then(function(datasetAgain) {
equal(dataset.get('name'), data.metadata.name);
deepEqual(dataset.get('headers'), data.metadata.headers);
equal(dataset.docCount, 6);
var queryObj = {
size: 4
, offset: 2
};
dataset.query(queryObj).then(function(documentList) {
deepEqual(indata.rows[2], documentList.models[0].toJSON());
deepEqual(data.documents[2], documentList.models[0].toJSON());
});
var queryObj = {
sort: [
@ -47,21 +47,21 @@ test('new Dataset', function () {
equal(doc0.x, 6);
});
dataset.query().then(function(docList) {
equal(docList.length, Math.min(100, indata.rows.length));
equal(docList.length, Math.min(100, data.documents.length));
var doc1 = docList.models[0];
deepEqual(doc1.toJSON(), indata.rows[0]);
deepEqual(doc1.toJSON(), data.documents[0]);
// Test UPDATE
var newVal = 10;
doc1.set({x: newVal});
doc1.save().then(function() {
equal(dataset.backendConfig.data.rows[0].x, newVal);
equal(data.documents[0].x, newVal);
})
// Test Delete
doc1.destroy().then(function() {
equal(dataset.backendConfig.data.rows.length, 5);
equal(dataset.backendConfig.data.rows[0].x, indata.rows[1].x);
equal(data.documents.length, 5);
equal(data.documents[0].x, inData.documents[1].x);
});
});
});