Rails Routing Explained: How URLs Map to Controllers in RESTful APIs

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A developer revisited Rails routing fundamentals after realizing they could build APIs but struggled to explain the underlying mechanics. Rails uses a routes.rb file to connect incoming HTTP requests to specific controller actions, with the 'resources' helper auto-generating standard CRUD routes. Key distinctions include 'resource' versus 'resources', and the 'member' versus 'collection' blocks for non-standard actions on single or multiple records respectively. Nested resources help express relationships between models in URLs, though deep nesting is discouraged for maintainability. Namespacing, such as '/api/v1/', keeps API controllers logically separated from regular web controllers within the application.

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