Class: Wallaby::IdRegexp

Inherits:
ResourcesRegexp show all
Defined in:
lib/routes/wallaby/id_regexp.rb

Instance Method Summary collapse

Instance Method Details

#execute ⇒ Object

This method works with Map.resources_regexp to complete the constraint restriction in ‘config/routes.rb`. This regular expression matches the ids which have all the possible resources names in front

It looks like ‘((?<=products/)|(?<=orders/)|(?<=order/items/)|…|(?<!.))+`:

  • ‘(?<=products/)` is a positive lookbehind assertion, it means the ids must have `products/` in front of itself, but the match data won’t include ‘products/`. it matches string e.g. `/admin/products/1`, and the match data is `1`.

  • ‘(?<!.)` is a negative lookbehind assertion, it means the ids must have nothing in front of itself. it matches string e.g. `1`, and the match data is `1`. this is required for URL helper when `:id` param is given, e.g. `resources_path(action: ’show’, resources: ‘products’, id: 1)‘

  • ‘[^/]+` is to match id. id can be anything as long as it doesn’t contain ‘|` character.



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# File 'lib/routes/wallaby/id_regexp.rb', line 19

def execute
  Regexp.new(<<~REGEXP, Regexp::EXTENDED)
    (
      #{resources_sources.map { |resources| "(?<=#{resources}/)" }.join('|')} # all the possible resources names in front of the id
      |(?<!.) # nothing is in front of the id, this is needed by URL helpers
    )
    [^/]+ # id
  REGEXP
end