Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/except_nested/core_ext/hash/except_nested.rb

Instance Method Summary collapse

Instance Method Details

#except_nested(*nested_keys) ⇒ Object

Returns a hash that includes everything except given nested keys.

hash = { a: true, b: { x: true, y: false }, c: nil }
hash.except_nested(:b, :c)            # => { a: true }
hash.except_nested(:a, b: [:x])       # => { b: { y: false }, c: nil }
hash.except_nested(:a, b: [:x, :y])   # => { c: nil }
hash                                  # => { a: true, b: { x: true, y: false }, c: nil }

It’s useful for limiting a set of parameters to everything but a few known toggles at any depth.

@person.update(params[:person].except_nested(:admin, settings: [:secrect_key]))



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# File 'lib/except_nested/core_ext/hash/except_nested.rb', line 14

def except_nested(*nested_keys)
  deep_dup.except_nested!(*nested_keys)
end

#except_nested!(*nested_keys) ⇒ Object

Removes the given nested keys from hash and returns it.

hash = { a: true, b: { x: true, y: false }, c: nil }
hash.except_nested!(b: [:y])       # => { a: true, b: { x: true }, c: nil }
hash                               # => { a: true, b: { x: true }, c: nil }



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# File 'lib/except_nested/core_ext/hash/except_nested.rb', line 22

def except_nested!(*nested_keys)
  nested_keys.each do |key|
    if key.is_a?(Hash)
      key.each do |sub_key, sub_value|
        if sub_value.is_a?(Array)
          self[sub_key].delete_if { |k, _| sub_value.include?(k) }
          delete(sub_key) if self[sub_key].empty?
        elsif sub_value.is_a?(Hash)
          self[sub_key].except_nested!(sub_value)
        else
          self[sub_key].except_nested!(Array.wrap(sub_value))
        end
      end
    elsif key.is_a?(Array)
      delete_if { |k, _| k == key.first }
    else
      delete(key)
    end
  end
  self
end