class ObjectPatch::Operations::Replace

A representation of a JSON pointer replace 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

replace with the provided data.

@option patch_data [String] value The value that should be written over

whatever is at the provided path.

@return [void]

# File lib/object_patch/operations/replace.rb, line 38
def initialize(patch_data)
  @path  = patch_data.fetch('path')
  @value = patch_data.fetch('value')
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/replace.rb, line 14
def apply(target_doc)
  return @value if processed_path.empty?

  key = processed_path.last
  inner_obj = ObjectPatch::Pointer.eval(processed_path[0...-1], target_doc)

  if inner_obj.is_a?(Array)
    raise ObjectPatch::InvalidIndexError unless key =~ /\A\d+\Z/
    inner_obj[key.to_i] = @value
  else
    inner_obj[key] = @value
  end

  target_doc
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/replace.rb, line 46
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 replace operation

# File lib/object_patch/operations/replace.rb, line 54
def to_patch
  { 'op' => 'replace', 'path' => @path, 'value' => @value }
end