Class: ElasticGraph::Indexer::HashDiffer

Inherits:
Object
  • Object
show all
Defined in:
lib/elastic_graph/indexer/hash_differ.rb

Class Method Summary collapse

Class Method Details

.diff(old, new, ignore_ops: []) ⇒ Object

Generates a string describing how ‘old` and `new` differ, similar to a git diff. `ignore_ops` can contain any of `:-`, `:+`, and `:~`; when provided those diff operations will be ignored.



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/elastic_graph/indexer/hash_differ.rb', line 17

def self.diff(old, new, ignore_ops: [])
  ignore_op_strings = ignore_ops.map(&:to_s).to_set

  diffs = ::Hashdiff.diff(old, new)
    .reject { |op, path, *vals| ignore_op_strings.include?(_ = op) }

  return if diffs.empty?

  diffs.map do |op, path, *vals|
    suffix = if vals.one?
      vals.first
    else
      vals.map { |v| "`#{v.inspect}`" }.join(" => ")
    end

    "#{op} #{path}: #{suffix}"
  end.join("\n")
end