Ruby constants file

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? Ask Question. Asked 11 years, 2 months ago. Active 27 days ago.

Viewed k times. What I've tried: Constant class variables in the model. But I couldn't find a sane way to define it so that I can write in my views Card. A method on the model, something like def colours ['white', AlexC AlexC 3, 3 3 gold badges 25 25 silver badges 25 25 bronze badges.

I appreciate that this is REALLY late, but for other readers I wonder why you didn't just define them in your model and use your controllers to pass them to your views. TomTom: Pass these constants into each view and helper that needs them? In other words, make the controller aware of which views need which constants?

That sounds like more of a violation of MVC. Add a comment. Active Oldest Votes. Holger Just Holger Just 48k 14 14 gold badges silver badges bronze badges. Thank you very much. An example where we are looking at constants defined at the top of the program and way of using it inside and outside of the program. In this example, we are focusing on the constant defined inside the class and the constant defined outside the class and also the way of use for the constant types.

This example contains a mixture of both constant inside the class and constant outside the class. From this tutorial we learned the basic concept of the Constants in Ruby, we learned about the importance of uses of constants in Ruby. We saw various examples that were describing the list of the constants which we can have in Ruby. This is a guide to Ruby Constants.

Here we discuss the basic concept of the Constants in Ruby, we learned about the importance of uses of constants in Ruby and its different examples. You can also go through our other suggested articles to learn more —. They are also numbers but with decimals.

Ruby strings are simply sequences of 8-bit bytes and they are objects of class String. Here, expr could be any ruby expression. Literals of Ruby Array are created by placing a comma-separated series of object references between the square brackets.

A trailing comma is ignored. A Range represents an interval which is a set of values with a start and an end. Ranges may be constructed using the s.. Ranges constructed using.. Those created using When used as an iterator, ranges return each value in the sequence. A range Eduonix Learning Solutions. Programming Line. Ruby - Variables, Constants and Literals Advertisements. Previous Page. Next Page. Live Demo.