Module: Api::Extensions::Expand

Defined in:
lib/api/extensions/expand.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object

Add expand_with class method on inclusion



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# File 'lib/api/extensions/expand.rb', line 10

def self.included(base)
  @@fetch_method_for_expand = :get

  base.class_eval 'def self.expand_with(symbol); @@fetch_method_for_expand = symbol; end'
end

Instance Method Details

#expand(resource, link) ⇒ Object

Actually expand a link



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# File 'lib/api/extensions/expand.rb', line 46

def expand(resource, link)
  if resource['links'].include?(link)
    sub_resource_uri = resource['links'][link]['href']
    sub_resource     = send(fetch_method_for_expand, sub_resource_uri)

    # 'self' links replace the original resource
    if link == 'self'
      resource = sub_resource
    else
      resource[link] = sub_resource
    end
  end

  resource
end

#process_expand(keys, scope) ⇒ Object

Process the expand functional extension



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# File 'lib/api/extensions/expand.rb', line 17

def process_expand(keys, scope)
  keys.split(',').each do |key|
    entries_parts = key.match(/entries\((.*)\)$/)

    if entries_parts && scope['entries']
      # (2) Collective key: expand=entries(self)
      scope['entries'].collect! { |entry| process_expand entries_parts[1], entry }
    else
      recursive = key.match(/([^\(]+)\((.*)\)$/)

      if recursive
        # (1) Recursive key: expand=section(parent)
        local_key, sub_key = recursive[1, 2]
        # Expand the local key
        scope = expand scope, local_key
        # Recursively expand the remaining keys - if possible
        new_scope = local_key == 'self' ? scope : scope[local_key]
        process_expand(sub_key, new_scope) if new_scope
      else
        # (0) Simple key: expand=section
        scope = expand scope, key
      end
    end
  end

  scope
end