Simpler derivation of singular & plural method names

CHANGELOG.md

@@ -6,8 +6,13 @@ Kubeclient release versioning follows [SemVer](https://semver.org/).
 
 ## Unreleased
 
+### Fixed
+- Support custom resources with lowercase `kind` (#361).
+- `create_security_context_constraint` now works (#366).
+- `get_security_context_constraints.kind`, `get_endpoints.kind` are now plural as in kubernetes (#366).
+
 ### Added
-- Add support for retrieving large lists of objects in chunks (#356)
+- Add support for retrieving large lists of objects in chunks (#356).
 
 ## 4.0.0 — 2018-07-23
 
@@ -86,6 +91,6 @@ No changes since 2.5.0, fixed packaging mistake.
 
 ### Added
 
-- `as: raw` option for `get_*` methods returning a string (#262 via #271)
+- `as: raw` option for `get_*` methods returning a string (#262 via #271).
 
 ## 2.4.0 - 2017-05-10

lib/kubeclient/common.rb

@@ -132,21 +132,38 @@ def discover
     end
 
     def self.parse_definition(kind, name)
-      # "name": "componentstatuses", networkpolicies, endpoints
-      # "kind": "ComponentStatus" NetworkPolicy, Endpoints
-      # maintain pre group api compatibility for endpoints and securitycontextconstraints.
-      # See: https://github.com/kubernetes/kubernetes/issues/8115
-      kind = kind[0..-2] if %w[Endpoints SecurityContextConstraints].include?(kind)
-
-      prefix = kind =~ /[A-Z]/ ? kind[0..kind.rindex(/[A-Z]/)] : kind # NetworkP
-      m = name.match(/^#{prefix.downcase}(.*)$/)
-      m && OpenStruct.new(
-        entity_type:   kind, # ComponentStatus
-        resource_name: name, # componentstatuses
-        method_names:  [
-          ClientMixin.underscore_entity(kind),         # component_status
-          ClientMixin.underscore_entity(prefix) + m[1] # component_statuses
-        ]
+      # Kubernetes gives us have 3 inputs:
+      #   kind: "ComponentStatus"
+      #   name: "componentstatuses"
+      #   singularName: "componentstatus" (usually kind.downcase)
+      # and want to derive singular and plural method names, with underscores:
+      #   "component_status"
+      #   "component_statuses"
+      # kind's CamelCase word boundaries determine our placement of underscores.
+
+      if IRREGULAR_NAMES[kind]
+        # In a few cases, the given kind / singularName itself is still plural.
+        # We require a distinct singular method name, so force it.
+        method_names = IRREGULAR_NAMES[kind]
+      else
+        # TODO: respect singularName from discovery?
+        # But how?  If it differs from kind.downcase, kind's word boundaries don't apply.
+        singular_name = kind.downcase
+
+        if name.start_with?(kind.downcase)
+          plural_suffix = name[kind.downcase.length..-1]             # "es"
+          singular_underscores = ClientMixin.underscore_entity(kind) # "component_status"
+          method_names = [singular_underscores, singular_underscores + plural_suffix]
+        else
+          # Something weird, can't infer underscores for plural so just give them up
+          method_names = [singular_name, name]
+        end
+      end
+
+      OpenStruct.new(
+        entity_type:   kind,
+        resource_name: name,
+        method_names:  method_names
       )
     end
 
@@ -321,9 +338,7 @@ def create_entity(entity_type, resource_name, entity_config)
       # TODO: temporary solution to add "kind" and apiVersion to request
       # until this issue is solved
       # https://github.com/GoogleCloudPlatform/kubernetes/issues/6439
-      # TODO: #2 solution for
-      # https://github.com/kubernetes/kubernetes/issues/8115
-      hash[:kind] = (entity_type.eql?('Endpoint') ? 'Endpoints' : entity_type)
+      hash[:kind] = entity_type
       hash[:apiVersion] = @api_group + @api_version
       response = handle_exception do
         rest_client[ns_prefix + resource_name]
@@ -435,7 +450,15 @@ def api
 
     private
 
-    # Format ditetime according to RFC3339
+    IRREGULAR_NAMES = {
+      # In a few cases, the given kind itself is still plural.
+      # https://github.com/kubernetes/kubernetes/issues/8115
+      'Endpoints'                  => %w[endpoint endpoints],
+      'SecurityContextConstraints' => %w[security_context_constraint
+                                         security_context_constraints]
+    }.freeze
+
+    # Format datetime according to RFC3339
     def format_datetime(value)
       case value
       when DateTime, Time