Support Ruby 3.x

.github/workflows/rspec.yml

@@ -9,16 +9,16 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    name: Ruby ${{ matrix.ruby }}
     strategy:
       matrix:
-        ruby: [ '2.5', '2.6', '2.7' ]
-
-    name: Ruby ${{ matrix.ruby }}
+        ruby: [ '2.5', '2.6', '2.7', '3.0', '3.1', '3.2' ]
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.ruby }}
-      - run: gem install bundler
-      - run: bundle install
-      - run: bundle exec rake
+    - uses: actions/checkout@v3
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - name: Run RSpec
+      run: bundle exec rspec

lib/wordmap.rb

@@ -14,7 +14,7 @@ class Wordmap
 
   class << self
     def create(path, hash, index_names = [])
-      raise ArgumentError, "Path already exists: #{path}" if Dir.exists?(path)
+      raise ArgumentError, "Path already exists: #{path}" if Dir.exist?(path)
 
       index_data = index_names.map { |name| [name, {}] }.to_h
       vecs = Builder.build_vectors(hash)