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beginning of pagination api

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Tim Griesser 2013-05-26 20:49:38 -04:00
parent 724592ec5f
commit 000e4e6a00
2 changed files with 68 additions and 1 deletions
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1
core/shared/models/dataProvider.bookshelf.base.js
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@ -24,6 +24,7 @@
* @param opts (optional)
*/
BookshelfBase.prototype.findAll = BookshelfBase.prototype.browse = function (opts) {
opts = opts || {};
return this.collection.forge().fetch(opts);
};

68
core/shared/models/dataProvider.bookshelf.posts.js
View file

@ -1,8 +1,10 @@
(function() {
"use strict";
var util = require('util'),
var _ = require('underscore'),
util = require('util'),
models = require('./models'),
Bookshelf = require('./bookshelf'),
BaseProvider = require('./dataProvider.bookshelf.base'),
PostsProvider;
@ -13,6 +15,70 @@
BaseProvider.call(this, models.Post, models.Posts);
};
/**
* Find results by page - returns an object containing the
* information about the request (page, limit), along with the
* info needed for pagination (pages, total).
*
* {
* posts: [
* {...}, {...}, {...}
* ],
* page: __,
* limit: __,
* pages: __,
* total: __
* }
*
* @params opts
*/
PostsProvider.prototype.findPage = function (opts) {
var postCollection;
opts = _.defaults(opts || {}, {
page: 1,
limit: 15,
where: null
});
postCollection = this.collection.forge();
// If there are where conditionals specified, add those
// to the query.
if (opts.where) {
postCollection.query('where', opts.where);
}
// Set the limit & offset for the query, fetching
// with the opts (to specify any eager relations, etc.)
// Omitting the `page`, `limit`, `where` just to be sure
// aren't used for other purposes.
return postCollection
.query('limit', opts.limit)
.query('offset', opts.limit * (opts.page - 1))
.fetch(_.omit(opts, 'page', 'limit', 'where'))
.then(function (collection) {
var qb;
// After we're done, we need to figure out what
// the limits are for the pagination values.
qb = Bookshelf.Knex(_.result(collection, 'tableName'));
if (opts.where) {
qb.where(opts.where);
}
return qb.count(_.result(collection, 'idAttribute')).then(function (resp) {
var totalPosts = resp.aggregate;
return {
posts: collection.toJSON(),
page: opts.page,
limit: opts.limit,
pages: Math.ceil(totalPosts / opts.limit),
total: totalPosts
};
});
});
};
util.inherits(PostsProvider, BaseProvider);
module.exports = PostsProvider;