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In Rails, the params hash is not just a plain old Ruby hash. Instead, it's an instance of ActionController::Parameters, a subclass of HashWithIndifferentAccess. This special kind of hash allows you to access its values using either symbols or strings as keys. The params hash usually contains several key-value pairs.

Strong parameters are a feature of Rails that allow developers to control which parameters are permitted in a controller action. This helps to prevent against mass assignment vulnerabilities, which can occur when a user sends unexpected parameters to a controller action.

Parameters in Rails let you access data sent by the browser, either in the URL or via form submission. In this article, we'll cover the basics of parameters, including what they are, how they work, and why they're important. We'll also learn how you can pass parameters when redirecting a request.

To get access to the params from ActionController::Parameters you need to first permit the params and then call #to_h on the object. The following returns the same thing as slice did previously. By default controller and action parameters are allowed.

The require method ensures that a specific parameter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Parameters for the key passed into require . The permit method returns a copy of the parameters object, returning only the permitted keys and values.

If you want to permit all parameters by default, Rails provides the permit_all_parameters option, which is false by default. If set to true , it will permit all the parameters (not recommended).

It's important to understand the two main types of parameters we'll encounter: URL parameters and query parameters. Although Rails combines both types into the params hash, they originate from different parts of an incoming HTTP request. URL parameters, also known as path parameters, are embedded directly into the URL.