class ObjectPatch::Operations::Copy

A representation of a JSON pointer copy operation.

Public Class Methods

new(patch_data) click to toggle source

Setup the replace operation with any required arguments.

@param [Hash] patch_data Parameters necessary to build the operation. @option patch_data [String] path The location in the target document to

duplicate the data to.

@option patch_data [String] from The source data that will be copied into

the new location.

@return [void]

# File lib/object_patch/operations/copy.rb, line 41
def initialize(patch_data)
  @from = patch_data.fetch('from')
  @path = patch_data.fetch('path')
end

Public Instance Methods

apply(target_doc) click to toggle source

Apply this operation to the provided document and return the updated document. Please note that the changes will be reflected not only in the returned value but the original document that was passed in as well.

@param [Object] target_doc The document that will be modified by this

patch.

@return [Object] The modified document

# File lib/object_patch/operations/copy.rb, line 14
def apply(target_doc)
  src_key = processed_from.last
  dst_key = processed_path.last

  src_obj = ObjectPatch::Pointer.eval(processed_from[0...-1], target_doc)
  dst_obj = ObjectPatch::Pointer.eval(processed_path[0...-1], target_doc)

  if src_obj.is_a?(Array)
    raise ObjectPatch::InvalidIndexError unless src_key =~ /\A\d+\Z/
    copied_obj = src_obj.fetch(src_key.to_i)
  else
    copied_obj = src_obj.fetch(src_key)
  end

  ObjectPatch::Operations.add_op(dst_obj, dst_key, copied_obj)

  target_doc
end
processed_from() click to toggle source

Returns the from field after being expanded by the JSON pointer semantics.

@return [Array<String>] Expanded pointer path

# File lib/object_patch/operations/copy.rb, line 49
def processed_from
  ObjectPatch::Pointer.parse(@from)
end
processed_path() click to toggle source

Returns the path after being expanded by the JSON pointer semantics.

@return [Array<String>] Expanded pointer path

# File lib/object_patch/operations/copy.rb, line 56
def processed_path
  ObjectPatch::Pointer.parse(@path)
end
to_patch() click to toggle source

Covert this operation to a format that can be built into a full on JSON patch.

@return [Hash<String => String>] JSON patch copy operation

# File lib/object_patch/operations/copy.rb, line 64
def to_patch
  { 'op' => 'copy', 'from' => @from, 'path' => @path }
end