如何在 Rails 应用程序中获取主机和端口

Question

In a Rails Model, I want to be able to find out the host and port. For example, if I am in a test environment it would return http://localhost:3000/ and if I was in production it would return something like http://my.application.com/ ?

Answer 1

host_with_port应该适合你： http ： host_with_port

Answer 2

"#{root_url}"

应该在您的routes.rb中声明

Answer 3

You can use this

<%= request.protocol + request.host_with_port %>
#=> https://example.com:3000
<%= request.protocol + request.host %>
#=> https://example.com

When you use in string concatenation

"#{request.protocol}#{request.host_with_port}/book/1"
# https://example.com:3000/book/1

Answer 4

You can get those values in your controllers (request.host, request.port etc.).

You'd have to give that to your models via parameters as the request object is only available in the controllers.

Answer 5

you can get full uri ( http://localhost:3000/ or http://my.application.com/ etc) with request_uri

http://apidock.com/rails/ActionController/AbstractRequest/request_uri

Answer 6

Other answers provided work in controllers or views but can't provide host name in eg: messaging jobs. Action mailer has it's own configuration for this that you're likely using anyway.

# Access host from anywhere 
Rails.configuration.action_mailer.default_url_options[:host]

# Defined in development.rb/test.rb/production.rb
config.action_mailer.default_url_options = { host: 'www.example.com' }

Answer 7

Request.host

http://api.rubyonrails.org/classes/ActionController/Request.html#M000712