class Hash
Public Instance Methods
deep_merge(second)
click to toggle source
# File lib/wedge/utilis/hash.rb, line 22 def deep_merge(second) merger = proc { |key, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : v2 } self.merge(second, &merger) end
extract!(*keys)
click to toggle source
Removes and returns the key/value pairs matching the given keys.
{ a: 1, b: 2, c: 3, d: 4 }.extract!(:a, :b) # => {:a=>1, :b=>2} { a: 1, b: 2 }.extract!(:a, :x) # => {:a=>1}
# File lib/wedge/utilis/hash.rb, line 70 def extract!(*keys) keys.each_with_object(self.class.new) { |key, result| result[key] = delete(key) if has_key?(key) } end
indifferent()
click to toggle source
# File lib/wedge/utilis/hash.rb, line 74 def indifferent Wedge::IndifferentHash.new self end
slice(*keys)
click to toggle source
Slice a hash to include only the given keys. Returns a hash containing the given keys.
{ a: 1, b: 2, c: 3, d: 4 }.slice(:a, :b) # => {:a=>1, :b=>2}
This is useful for limiting an options hash to valid keys before passing to a method:
def search(criteria = {}) criteria.assert_valid_keys(:mass, :velocity, :time) end search(options.slice(:mass, :velocity, :time))
If you have an array of keys you want to limit to, you should splat them:
valid_keys = [:mass, :velocity, :time] search(options.slice(*valid_keys))
# File lib/wedge/utilis/hash.rb, line 46 def slice(*keys) keys.map! { |key| convert_key(key) } if respond_to?(:convert_key, true) keys.each_with_object(self.class.new) { |k, hash| hash[k] = self[k] if has_key?(k) } end
slice!(*keys)
click to toggle source
Replaces the hash with only the given keys. Returns a hash containing the removed key/value pairs.
{ a: 1, b: 2, c: 3, d: 4 }.slice!(:a, :b) # => {:c=>3, :d=>4}
# File lib/wedge/utilis/hash.rb, line 56 def slice!(*keys) keys.map! { |key| convert_key(key) } if respond_to?(:convert_key, true) omit = slice(*self.keys - keys) hash = slice(*keys) hash.default = default hash.default_proc = default_proc if default_proc replace(hash) omit end
to_obj()
click to toggle source
add keys to hash
# File lib/wedge/utilis/hash.rb, line 3 def to_obj self.each do |k,v| if v.kind_of? Hash v.to_obj end k=k.to_s.gsub(/\.|\s|-|\/|\'/, '_').downcase.to_sym ## create and initialize an instance variable for this key/value pair self.instance_variable_set("@#{k}", v) ## create the getter that returns the instance variable self.class.send(:define_method, k, proc{self.instance_variable_get("@#{k}")}) ## create the setter that sets the instance variable self.class.send(:define_method, "#{k}=", proc{|v| self.instance_variable_set("@#{k}", v)}) end return self end