domain_from(host, tld_length) — ActionDispatch::Http::URL::DomainExtractor

domain_from(host, tld_length)

Extracts the domain part from a host string, including the specified number of top-level domain components.

The domain includes the main domain name plus the TLD components. The +tld_length+ parameter specifies how many components from the right should be considered part of the TLD.

==== Parameters

[+host+] The host string to extract the domain from.

[+tld_length+] The number of domain components that make up the TLD. For example, use 1 for “.com” or 2 for “.co.uk”.

==== Examples

# Standard TLD (tld_length = 1) DomainExtractor.domain_from(“www.example.com”, 1) # => “example.com”

# Country-code TLD (tld_length = 2) DomainExtractor.domain_from(“www.example.co.uk”, 2) # => “example.co.uk”

# Multiple subdomains DomainExtractor.domain_from(“api.staging.myapp.herokuapp.com”, 1) # => “herokuapp.com”

# Single component (returns the host itself) DomainExtractor.domain_from(“localhost”, 1) # => “localhost”

Parameters

host req
tld_length req

Source

# File actionpack/lib/action_dispatch/http/url.rb, line 64
        def domain_from(host, tld_length)
          host.split(".").last(1 + tld_length).join(".")
        end

Defined in actionpack/lib/action_dispatch/http/url.rb line 64 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActionDispatch::Http::URL::DomainExtractor

Signature

Parameters