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    <p>You have two problems:</p> <ol> <li><code>findBooks</code> tries to access <code>response</code>, but <code>response</code> is not in scope at that point.</li> <li>You're calling <code>findBooks</code> with <code>err</code> and <code>books</code> and passing the return value to <code>BookModel.find</code>, when you probably want to pass the function for <code>find</code> to call.</li> </ol> <p>Let's first solve the second problem. Rather than calling the function, just pass it:</p> <pre><code>return BookModel.find(findBooks); </code></pre> <p>That was easy. Now, to solve the first problem, we'll need to add an extra argument to <code>findBooks</code>. I'll assume you put it at the start for reasons I'll detail later. Then we can change the usage to look like this:</p> <pre><code>return BookModel.find(function (err, books) { return findBooks(response, err, books); }); </code></pre> <p>It turns out, though, that there's a more concise way to do that, using <code>bind</code>. <code>bind</code> is best known for its use in binding the value of <code>this</code>, but it can also be used to bind arguments:</p> <pre><code>return BookModel.find(findBooks.bind(null, response)); </code></pre> <p>All together, we get:</p> <pre><code>function findBooks (response, err, books) { if (!err) { return response.send(books); } else { console.log(err); } } // Get all books app.get('/api/books', function (request, response) { return BookModel.find( findBooks.bind(null, response) ); }); </code></pre>
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    1. POWhy cant I pull the callback out of the app.get function in node and express.js?
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    1. USicktoofay
    1. USicktoofay
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    1. POWhy cant I pull the callback out of the app.get function in node and express.js?
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    1. CO`find` take an iterator. So this is not working.
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      1. USromualdr
    2. CO@DaFunix: I was assuming that this was server-side code, where Backbone is not being used. I don't know for sure what *is* being used, but the `err` of `findBooks` strongly indicates `find` takes a callback and does its work asynchronously, so I wrote my answer with that in mind.
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    3. CO@DaFunix Your downvote and comment are not related to the question at hand. The question is about why the callback isn't working properly, and that is because of variable scope, as described in this answer.
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      1. USMatthew Blancarte
 

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