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POUsing underscore.js to copy backbone.js Model attributes - algorithm
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  1. POUsing underscore.js to copy backbone.js Model attributes - algorithm
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    copied!<p>I want to copy all attributes from backbone.js Model object to another if they are not undefined. It's a little like a child overriding the attributes of a parent. There will be some attributes of the child object which should be excluded from the entire process. This is what I have so far:</p> <pre><code>function inherit(parent, child) { var childAttributes = Object.keys(child.attributes); // Don't involve these attributes in any way, they're special. attributes = _.without(attributes, ['specialCase1', 'specialCase2', 'specialCase3']); // This array will store undefined child attributes var undefChildAttributes = new Array(); for (i in attributes) { var attr = attributes[i]; // Get attribute name var value = child.get(attr); // ... and value var type = RealTypeOf(value); // ... and type if (type == 'undefined') { undefChildAttributes.push(attr); } } // Update the child attributes array to not include undefined any attributes attributes = _.without(attributes, undefChildAttributes); // Copy any attributes from child to parent // ------------------ PROBLEM AREA ------------------ for (var m=0; m&lt;attributes.length; m++) { var attr = attributes[m]; // Attribute to copy // I want to use _.extends in some way here, maybe like: _.extends(parent, child[attr]); } } </code></pre> <p>I'm stuck at the point of how to copy the attribute into the parent. The only way I have atm is a hack:</p> <pre><code>if (type == 'string') { eval('var o = {' + attr + ':"' + child.get(attr) + '"};'); } else { eval('var o = {' + attr + ':' + child.get(attr) + '};'); } parent.set(o); </code></pre>
 

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