instance method
subdomains_from
Ruby on Rails edge
Since v8.1.4Available in: v8.1.4 edge
Signature
subdomains_from(host, tld_length)Extracts the subdomain components from a host string as an Array.
Returns all the components that come before the domain and TLD parts. The tld_length parameter is used to determine where the domain begins so that everything before it is considered a subdomain.
Parameters
host-
The host string to extract subdomains from.
tld_length-
The number of domain components that make up the TLD. This affects where the domain boundary is calculated.
Examples
# Standard TLD (tld_length = 1)
DomainExtractor.subdomains_from("www.example.com", 1)
# => ["www"]
# Country-code TLD (tld_length = 2)
DomainExtractor.subdomains_from("api.staging.example.co.uk", 2)
# => ["api", "staging"]
# No subdomains
DomainExtractor.subdomains_from("example.com", 1)
# => []
# Single subdomain with complex TLD
DomainExtractor.subdomains_from("www.mysite.co.uk", 2)
# => ["www"]
# Multiple levels of subdomains
DomainExtractor.subdomains_from("dev.api.staging.example.com", 1)
# => ["dev", "api", "staging"]
Parameters
-
hostreq -
tld_lengthreq
Source
# File actionpack/lib/action_dispatch/http/url.rb, line 102
def subdomains_from(host, tld_length)
parts = host.split(".")
parts[0..-(tld_length + 2)]
end
Defined in actionpack/lib/action_dispatch/http/url.rb line 102
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Defined in ActionDispatch::Http::URL::DomainExtractor