Ruby templates tutorial

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ERB copies the text portions of the template directly to the generated document, and only processes code that is identified by markers. Most ERB templates only use a combination of two tag markers, each of which cause the enclosed code to be handled in a particular way. A tag with an equals sign indicates that enclosed code is an expression , and that the renderer should substitute the code element with the result of the code as a string when it renders the template.

Use an expression to embed a line of code into the template, or to display the contents of a variable:. Tags without the equals sign denote that the enclosed code is a scriptlet. Each scriptlet is caught and executed, and the final result of the code is then injected in to the output at the point of the scriptlet. Notice that the scriptlets in this example enclose an expression. The scriptlets produce no text themselves, but cause the enclosed expression to run multiple times, and the result of the expression is written to the output each time.

By default, a newline character is added to the page after the position of each tag. To suppress this newline, use the optional parameter of ERB. Rails extends ERB, so that you can suppress the newline simply by adding a trailing hyphen to tags in Rails templates:. Sinatra supports templates out of the box.

Using ERB templates also does not require any additional dependencies. Sinatra will look for a default layout of layout. If a layout exists it will default to that. If a layout. You can return a template using the following syntax.

For example if an iterable object was passed to the ERB template you could do:. One important thing to keep in mind is that any data provided by a user could be malicious. You should always escape any HTML provided to lower cross-site scripting and cross-site request forgery risks.

You can use the Rack::Utils. It will be available after calling require 'sinatra'. Sessions are a way of persisting data for a user that can be accessed across multiple requests. A common use for sessions is to store a token used to validate authentication on the server. To use them in Sinatra you simply have to enable them and then the session object becomes available.

It automatically handles the overhead of managing sessions. It uses Rack under the hood to manage sessions and cookies, which you can utilize directly if desired. It uses serialized, signed and encrypted cookie data rather than a database to maintain the session information.

Users cannot read the data since it is encrypted, and they cannot tamper with it because it is signed. Redirecting is as simple as calling the redirect function. Another useful function provided is the to function. Using to will generate a fully qualified URL based on the current server and protocol. By default it uses a temporary redirect code. Now to check whether installation is done correctly, open command prompt and type ruby -v and hit Enter.

You will see some output like ruby 2. It means we have successfully installed Ruby and we are good to go. Skip to content. Change Language.

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