Ruby: remove some redundant getASubclass() calls

ruby/ql/lib/codeql/ruby/frameworks/ActiveRecord.qll

@@ -40,7 +40,7 @@ private API::Node activeRecordClassApiNode() {
       // In Rails applications `ApplicationRecord` typically extends `ActiveRecord::Base`, but we
       // treat it separately in case the `ApplicationRecord` definition is not in the database.
       API::getTopLevelMember("ApplicationRecord")
-    ].getASubclass()
+    ]
 }
 
 /**
@@ -58,7 +58,7 @@ private API::Node activeRecordClassApiNode() {
 class ActiveRecordModelClass extends ClassDeclaration {
   ActiveRecordModelClass() {
     this.getSuperclassExpr() =
-      activeRecordClassApiNode().getAValueReachableFromSource().asExpr().getExpr()
+      activeRecordClassApiNode().getASubclass().getAValueReachableFromSource().asExpr().getExpr()
   }
 
   // Gets the class declaration for this class and all of its super classes

ruby/ql/lib/codeql/ruby/frameworks/ActiveResource.qll

@@ -17,8 +17,9 @@ module ActiveResource {
   /**
    * An ActiveResource model class. This is any (transitive) subclass of ActiveResource.
    */
+  pragma[nomagic]
   private API::Node modelApiNode() {
-    result = API::getTopLevelMember("ActiveResource").getMember("Base").getASubclass+()
+    result = API::getTopLevelMember("ActiveResource").getMember("Base").getASubclass()
   }
 
   /**

ruby/ql/lib/codeql/ruby/frameworks/ActiveStorage.qll

@@ -85,7 +85,6 @@ module ActiveStorage {
           // Class methods
           API::getTopLevelMember("ActiveStorage")
               .getMember("Blob")
-              .getASubclass()
               .getAMethodCall(["create_after_unfurling!", "create_and_upload!"]),
           // Instance methods
           any(BlobInstance i, DataFlow::CallNode c |

ruby/ql/lib/codeql/ruby/frameworks/GraphQL.qll

@@ -42,7 +42,7 @@ private class GraphqlRelayClassicMutationClass extends ClassDeclaration {
     this.getSuperclassExpr() =
       graphQlSchema()
           .getMember("RelayClassicMutation")
-          .getASubclass*()
+          .getASubclass()
           .getAValueReachableFromSource()
           .asExpr()
           .getExpr()

ruby/ql/lib/codeql/ruby/frameworks/Twirp.qll

@@ -18,8 +18,7 @@ module Twirp {
    */
   class ServiceInstantiation extends DataFlow::CallNode {
     ServiceInstantiation() {
-      this =
-        API::getTopLevelMember("Twirp").getMember("Service").getASubclass().getAnInstantiation()
+      this = API::getTopLevelMember("Twirp").getMember("Service").getAnInstantiation()
     }
 
     /**
@@ -62,7 +61,7 @@ module Twirp {
    */
   class ClientInstantiation extends DataFlow::CallNode {
     ClientInstantiation() {
-      this = API::getTopLevelMember("Twirp").getMember("Client").getASubclass().getAnInstantiation()
+      this = API::getTopLevelMember("Twirp").getMember("Client").getAnInstantiation()
     }
   }