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    Sails.js In Action Pdf

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    Tools of the trade 2. Choosing a text editor versus an IDE 2. Whoa, command-line? Installing Node 2. How code is organized in Node. What is a Node module? Creating our first Sails application 2. Using a module from NPM 2.

    Install Sails The following command will install Sails globally: sudo npm -g install sails You can test whether the framework was installed with this command: sails --version It should output the number of the latest stable version of Sails. In the world of Node. All requests are handled in the same OS process sequentially by your application. In contrast, Apache will spawn multiple sub-processes or threads, and each request will have its own context space.

    So, how can your application serve multiple requests without those requests noticeably blocking each other? The key to this is a major feature of the Node. Every asynchronous method allows you to specify a callback function, which is activated as soon as the requested operation completes. The result of the operation or error description gets passed to your callback function. That way, your application can delegate all heavy work and continue with its own business, returning later to collect the results and continue where it left off.

    Note: The more convenient and modern approach is to use promises instead of callback functions, but that is beyond the scope of this article. Just run the following: sails lift Sails will initialize the application, bind to the configured port and start to listen for HTTP requests. Note: When your application is lifted, the terminal window will be in blocked state.

    At this point, the default page should load correctly. Sails is an MVC framework, so starting from these components to see what glues them all together makes sense. The entry point to our application is the app. All it does is require top-level dependencies and give control to Sails itself. After that, all of the magic happens in the framework. Routing Component When Sails receives an HTTP request, it actually uses its router component to find the controller responsible for generating the response.

    If you open this file now, you will see that it contains only a single entry: module. No code snippets in this article will contain any built-in comments, in order to preserve space and improve readability. The view property of the configuration contains the homepage value, which is the name of the view the V in MVC.

    Views Layer Views are handled by a separate component of the framework. So, choose the language that is most suitable for you, your project and your team. All templates are located in the views directory of your project. Note: All templates are rendered dynamically on the server. You will not need to restart Sails in order to refresh any changed templates.

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    All changes will be shown immediately upon the page being refreshed. Try it! If you look at the homepage. This is on purpose. This really helps to keep things DRY.

    However, if you need to use another layout for some particular page, you can easily override the property dynamically in your controller.

    Be advised that this layout configuration works only for the default EJS templating system and will not work with other languages. This is done for the purpose of legacy- and backwards-compatibility. Using the layout functionality provided by the templating language of your choice is recommended.

    For example, in Twig and Jinja2, you can use the extends expression to extend a parent template and overload required blocks. Using Custom Views Engine This section demonstrates how to change the views engine that is used to render templates in Sails. This should give you an idea of how easy some parts of Sails can be overridden and customized. So, I highly recommend you try it.

    Note: Twig and Jinja2 are a common family of templating languages with the same core functionality and features. However, each concrete implementation can have its own small differences and flavors.

    Sailing With Sails.js: An MVC-style Framework For Node.js

    I will be using the Swig library during the course of this article. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

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    Sails.js 101

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    Sails comes with a powerful "body parser", Skipper , which makes it easy to implement streaming file uploads—not only to the server's filesystem i. In the same way that you might send a form POST to a URL with text parameters like "name", "email", and "password", you send files as file parameters like "avatar" or "newSong".

    Take this simple example: req. Below is a more in-depth example that demonstrates how you could allow users to upload an avatar image and link it to an account. This example assumes that you've already taken care of access control in a policy, and that you're storing the id of the logged-in user in req. Where do the files go? This can be overridden using the dirname option.

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