How to use URL including dot (decimal point) in Rails 4.x
What I want to do
GET http://domain.jp/api/2.1.1/users
or
GET http://domain.jp/meats/score/21293.02
(You may say URL with parameter including dot is not good....)
How I failed
config/routes.rb
get 'meats/score/:score' => 'meats#score'
routing_spec
it "routes to #score" do
expect(:get => "/meats/score/5.4").to route_to("meats#score", score: "5.4", format: "json")
end
And start rspec
No route matches "/meats/score/5.4"
Like above, I got No route matches
Rails does not permit to use dot in URL without any configuration
As this article says、Rails does not permit it.
By default the :id parameter doesn't accept dots - this is because the dot is used as a separator for formatted routes. If you need to use a dot within an :id add a constraint which overrides this - for example id: /[^\/]+/ allows anything except a slash.
Then how to resolve - Using constraints , set restriction as regular expression
Constraints mean....
something that limits your freedom to do what you want [= restriction]
constraint against parameter
example of constraints
resources :photos, constraints: { id: /[A-Z][A-Z][0-9]+/ }
Line above means /photos/AB1
Very easy way to use dot in URL
get 'meats/score/:score' => 'meats#score', score: /[^\/]
This permit any character except slash /
Permit to use dot with limited format
Number + dot + Number
get 'meats/score/5.1' => 'meats#score', constraints: { score: /\d+\.\d+/ }
like 2.2.2.2.2.2.2.2
get 'meats/score/5.1' => 'meats#score', constraints: { score: /\d+(\.\d+)*/ }
like api/v2.1.1/foo
(You may say this is bad way of api versioning....)
You can use constraint below
, constraints: { api_version: /v\d+(\.\d+)*/ }
