feat: add support for multiple patterns with same arguments

gapic-generator/lib/gapic/presenters/resource_presenter.rb

@@ -26,10 +26,13 @@ class ResourcePresenter
       def initialize resource
         @resource = resource
 
-        @patterns = resource.pattern.map { |pattern| PatternPresenter.new pattern }
+        all_patterns = resource.pattern.map { |pattern| PatternPresenter.new pattern }
 
         # Keep only patterns that can be used to create path helpers
-        @patterns.filter!(&:useful_for_helpers?)
+        all_useful_patterns = all_patterns.filter(&:useful_for_helpers?)
+
+        # Remove patterns where key is duplicated
+        @patterns = ResourcePresenter.dedup_patterns all_useful_patterns
       end
 
       def dup
@@ -52,6 +55,25 @@ def path_helper
         "#{ActiveSupport::Inflector.underscore name}_path"
       end
 
+      ##
+      # Deduplicates pattern that have the same `arguments_key`. Our design for the "paths" helper
+      # only allows for one pattern per `arguments_key`.
+      #
+      # If patterns with the same `arguments_key` are detected, the shortest is taken. If there is
+      # a tie, the lexicographically first is taken.
+      #
+      # @param patterns [Array<PatternPresenter>]
+      #
+      # @return [Array<PatternPresenter>]
+      #
+      def self.dedup_patterns patterns
+        patterns.group_by(&:arguments_key).map do |_arguments_key, group|
+          group.min_by do |pattern|
+            [pattern.pattern.length, pattern.pattern]
+          end
+        end
+      end
+
       ##
       # A presenter for a particular pattern
       #

gapic-generator/test/gapic/presenters/resource_presenter_test.rb

@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require "test_helper"
+require "gapic/presenters/resource_presenter"
+
+class ResourcePresenterTest < PresenterTest
+  def test_noargument_nodedup
+    patterns = [ 
+      "hello/compatibility/world"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/compatibility/world"], deduped_patterns
+  end
+
+  def test_noargument_dedup
+    patterns = [ 
+      "hello/world",
+      "hello/zorld",
+      "hello/compatibility/world"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/world"], deduped_patterns
+  end
+
+  def test_noargument_dedup_with_additional
+    patterns = [ 
+      "hello/world",
+      "hello/compatibility/world",
+      "hello/{foo}/world/{world}"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/world", "hello/{foo}/world/{world}"], deduped_patterns
+  end
+
+  def test_argument_nodedup
+    patterns = [ 
+      "hello/{foo}/world/{world}"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/{foo}/world/{world}"], deduped_patterns
+  end
+
+  def test_argument_dedup
+    patterns = [ 
+      "hello/{foo}/world/{world}",
+      "hello/{foo}/compatibility/world/{world}",
+      "hello/{foo}/zorld/{world}"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/{foo}/world/{world}"], deduped_patterns
+  end
+
+  def test_argument_dedup_with_additional
+    patterns = [ 
+      "hello/{foo}/world/{world}",
+      "hello/{foo}/compatibility/world/{world}",
+      "baz/{baz}"
+    ].map { |pattern| Gapic::Presenters::ResourcePresenter::PatternPresenter.new pattern }
+
+    deduped_patterns = Gapic::Presenters::ResourcePresenter.dedup_patterns(patterns).map(&:pattern)
+
+    assert_equal ["hello/{foo}/world/{world}",  "baz/{baz}"], deduped_patterns
+  end
+end

shared/gem_defaults.rb

@@ -155,6 +155,7 @@ def gem_defaults
         "testing/grpc_service_config/grpc_service_config.proto",
         "testing/mixins/mixins.proto",
         "testing/routing_headers/routing_headers.proto",
+        "testing/resources/resources.proto",
         "testing/nonstandard_lro_grpc/nonstandard_lro_grpc.proto",
         # `locations.proto` is included here because it is often
         # included in the real world libraries

shared/output/gapic/templates/testing/lib/testing.rb

@@ -29,4 +29,5 @@
 # require "testing/grpc_service_config"
 # require "testing/mixins"
 # require "testing/nonstandard_lro_grpc"
+# require "testing/resources"
 # require "testing/routing_headers"

shared/output/gapic/templates/testing/lib/testing/resources.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+# The MIT License (MIT)
+#
+# Copyright <YEAR> <COPYRIGHT HOLDER>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# Auto-generated by gapic-generator-ruby. DO NOT EDIT!
+
+require "testing/resources/service_resources"
+require "testing/version"
+
+module Testing
+  ##
+  # API client module.
+  #
+  # @example Load this package, including all its services, and instantiate a gRPC client
+  #
+  #     require "testing/resources"
+  #     client = ::Testing::Resources::ServiceResources::Client.new
+  #
+  module Resources
+  end
+end
+
+helper_path = ::File.join __dir__, "resources", "_helpers.rb"
+require "testing/resources/_helpers" if ::File.file? helper_path

shared/output/gapic/templates/testing/lib/testing/resources/service_resources.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+# The MIT License (MIT)
+#
+# Copyright <YEAR> <COPYRIGHT HOLDER>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# Auto-generated by gapic-generator-ruby. DO NOT EDIT!
+
+require "gapic/common"
+require "gapic/config"
+require "gapic/config/method"
+
+require "testing/version"
+
+require "testing/resources/service_resources/credentials"
+require "testing/resources/service_resources/paths"
+require "testing/resources/service_resources/client"
+
+module Testing
+  module Resources
+    ##
+    # @example Load this service and instantiate a gRPC client
+    #
+    #     require "testing/resources/service_resources"
+    #     client = ::Testing::Resources::ServiceResources::Client.new
+    #
+    module ServiceResources
+    end
+  end
+end
+
+helper_path = ::File.join __dir__, "service_resources", "helpers.rb"
+require "testing/resources/service_resources/helpers" if ::File.file? helper_path