offshore
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An ORM for Node.js
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<a href="../../../index.html">all files</a> / <a href="index.html">lib/offshore/query/</a> stream.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Streaming Queries
*/
var usageError = require('../utils/usageError');
var utils = require('../utils/helpers');
var normalize = require('../utils/normalize');
var ModelStream = require('../utils/stream');
module.exports = {
/**
* Stream a Result Set
*
* @param {Object} criteria
* @param {Object} transformation, defaults to JSON
*/
stream: function(criteria, transformation, metaContainer) {
var self = this;
var usage = utils.capitalize(this.identity) + '.stream([criteria],[options])';
// Normalize criteria and fold in options
criteria = normalize.criteria(criteria);
// Transform Search Criteria
criteria = self._transformer.serialize(criteria);
// Configure stream to adapter, kick off fetch, and return stream object
// so that user code can use it as it fires data events
var stream = new ModelStream(transformation);
// very important to wait until next tick before triggering adapter
// otherwise write() and end() won't fire properly
process.nextTick(function() {
// Write once immediately to force prefix in case no models are returned
stream.write();
// Trigger Adapter Method
self.adapter.stream(criteria, stream, metaContainer);
});
return stream;
}
};
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