method

mount

v7.1.3.2 - Show latest stable - 0 notes - Class: Base

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What's this?

mount(app, options = nil) public

Mount a Rack-based application to be used within the application.

mount SomeRackApp, at: "some_route"

Alternatively:

mount(SomeRackApp => "some_route")

For options, see match, as mount uses it internally.

All mounted applications come with routing helpers to access them. These are named after the class specified, so for the above example the helper is either some_rack_app_path or some_rack_app_url. To customize this helper’s name, use the :as option:

mount(SomeRackApp => "some_route", as: "exciting")

This will generate the exciting_path and exciting_url helpers which can be used to navigate to this mounted app.

Show source

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 599
        def mount(app, options = nil)
          if options
            path = options.delete(:at)
          elsif Hash === app
            options = app
            app, path = options.find { |k, _| k.respond_to?(:call) }
            options.delete(app) if app
          end

          raise ArgumentError, "A rack application must be specified" unless app.respond_to?(:call)
          raise ArgumentError, <<~MSG unless path
            Must be called with mount point

              mount SomeRackApp, at: "some_route"
              or
              mount(SomeRackApp => "some_route")
          MSG

          rails_app = rails_app? app
          options[:as] ||= app_name(app, rails_app)

          target_as       = name_for_action(options[:as], path)
          options[:via] ||= :all

          match(path, { to: app, anchor: false, format: false }.merge(options))

          define_generate_prefix(app, target_as) if rails_app
          self
        end

mount

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