Rails define layout file

This is however discouraged as class variables might act kind of surprising with inheritance and in multi-thread environments. The two options above allow you to change the returned array on each invocation of the accessor method if required. If you have true a truly unchangeable constant, you can also define it on the model class:. You could also create global constants which are accessible from everywhere in an initializer like in the following example.

This is probably the best place, if your colours are really global and used in more than one model context. Note: when we define constants above, often we want to freeze the array. That prevents other code from later inadvertently modifying the array by e. Once an object is frozen, it can't be changed anymore. As of Rails 4. However, it can only be used for non-nested configuration:. For application-wide settings and for global constants I recommend to use Settingslogic.

This settings are stored in YML file and can be accessed from models, views and controllers. Furthermore, you can create different settings for all your environments:. Somewhere in the view I prefer helper methods for such kind of stuff or in a model you can get, for ex. It's very flexible. And you don't need to invent a bike. Try to keep all constant at one place, In my application I have created constants folder inside initializers as follows:.

Then Model. Alternatively, create an initializer and wrap the constants in a module to avoid namespace conflicts. It is very useful if the constants are going to be different for different environments. In addition, if you have a plan to extend them, say you want to add 'yellow' on a later date, you could simply add a new row to the lookup table and be done with it.

If you give the admin permissions to modify this table, they will not come to you for maintenance. According your condition, you can also define some environmental variables, and fetch it via ENV['some-var'] in ruby code, this solution may not fit for you, but I hope it may help others.

Example: you can create different files. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ruby on Rails: Where to define global constants? You can manage the relational database with scripts you create and place in this directory. You can assist RubyDoc with comments in your code.

This directory holds all the RubyDoc-generated Rails and application documentation. Rails creates scripts that help you manage various error logs. You'll find separate logs for the server server. For example, there are scripts to generate code generate and launch the web server server.

Improve this answer. Prakash Murthy Prakash Murthy So layouts are specific types of templates? Yup, layouts are specific types of templates. There can be multiple layout files; which layout is rendered is dependent on the config in the controllers.

Other layouts can be explicitly invoked from the controllers. Partials are like subroutines in programs, where the details of a specific functionality is hidden away from the main program. Partials help in keeping the views DRY. Do checkout guides. What is a layout? BenKoshy BenKoshy 28k 11 11 gold badges 92 92 silver badges 73 73 bronze badges. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. Active Oldest Votes. What is a layout? Improve this answer. Prakash Murthy Prakash Murthy Maybe you could elaborate on the meaning of the term "layout" itself.

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