Converting an array of strings into a key-value pair

Question

I have an array as the value of a hash:

:params=>[":centre_id", ":id"]

I am trying to find a way to convert each element of the array to something like this:

:centre_id => 1
:id => 1

I tried loads of different ways but I can't seem to find a nice clean way to do it:

"#{route[:params].map {|x| x.parameterize.underscore.to_sym => '1'}}"

This is what I am trying to achieve:

-{"controller"=>"venues", "action"=>"activity, {:centre_id=>1, :id=>1}"}
+{"controller"=>"venues", "action"=>"activity", "centre_id"=>"1", "id"=>"1"} << this one

    string or symbol doesn't matter does it?

Using this:

expect(route[:request_method] => route[:path]).to route_to "#{route[:controller]}##{route[:action]}, #{Hash[route[:params].map {|x| [x.sub(/\A:/,'').to_sym, 1] }]}"

Help would be much appreciated.

@tadman [{:request_method=>:get, :path=>"/leisure/1/activity/1", :controller=>"venues", :params=>[":centre_id", ":id"], :controller_constant=>"VenuesController", :action=>"activity"}, — user3868832
– user3868832, Commented Oct 29, 2014 at 17:55
i want to achieve something like get("/game/1").should route_to("game#show", :id => 1) — user3868832
– user3868832, Commented Oct 29, 2014 at 17:56

Arup Rakshit · Accepted Answer · 2014-10-29 17:41:08Z

4

Do as below :-

Ruby 2.1 or above, use below :-

route[:params].map {|x| [x.sub(/\A:/,'').to_sym, 1] }.to_h
# => {:centre_id => 1, :id => 1}

Ruby 2.0 or below, use below :-

Hash[route[:params].map {|x| [x.sub(/\A:/,'').to_sym, 1] }]
# => {:centre_id => 1, :id => 1}

edited Oct 29, 2014 at 17:41

answered Oct 29, 2014 at 17:33

Arup Rakshit

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6 Comments

Arup Rakshit Over a year ago

@tadman Thanks for teaching.. sweet thing. I am not well in regex, so always try to avoid.. :-(

tadman Over a year ago

It's something you should make a point to practice. A site like Rubular is a great way to test and learn. Once you've got a handle on them you'll find they come in handy all the time.

user3868832 Over a year ago

Hey guys, thanks for your help, but it renders error undefined method `to_h' for [[:centre_id, 1], [:id, 1]]:Array

tadman Over a year ago

The to_h method might be Rails specific. An alternative is to use Hash[ ... ] instead of (...).to_h

Arup Rakshit Over a year ago

@user3868832 your Ruby version ?

|

Cary Swoveland · Accepted Answer · 2014-10-29 18:21:39Z

1

If

h = { :params=>[":centre_id", ":id"], :animals=>[":dog", ":cat", ":pig"] }

one of the following may be helpful:

h.merge(h) { |_,v,_| Hash[v.map { |s| [s[1..-1].to_sym,1] }] }
  #=> {:params=>{:centre_id=>1, :id=>1}, :animals=>{:dog=>1, :cat=>1, :pig=>1}}

or

Hash[h.keys.map { |k| h.delete(k).map { |s| [s[1..-1].to_sym,1] } }.flatten(1)]
  #=> {:centre_id=>1, :id=>1, :dog=>1, :cat=>1, :pig=>1}

The second modifies h. If you don't want that to happen, you'll need to h.dup first.

If a is an array, you can replace Hash[a] with a.to_h with Ruby 2.1+.

answered Oct 29, 2014 at 18:21

Cary Swoveland

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Converting an array of strings into a key-value pair

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Ruby 2.1 or above, use below :-

Ruby 2.0 or below, use below :-

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Ruby 2.1 or above, use below :-

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