Surface missing methods inside qb callbacks

models/QuickBuilder.cfc

@@ -476,12 +476,10 @@ component accessors="true" transientCache="false" {
 				arguments.onFalse( this );
 			}
 		} else {
+			var selectedCallback = arguments.condition ? arguments.onTrue : arguments.onFalse;
+			var builder          = this;
 			variables.qb.withScoping( function() {
-				if ( condition ) {
-					onTrue( this );
-				} else {
-					onFalse( this );
-				}
+				selectedCallback( builder );
 			} );
 		}
 
@@ -990,7 +988,17 @@ component accessors="true" transientCache="false" {
 			return result;
 		}
 
-		return javacast( "null", "" );
+		throw(
+			type    = "QuickMissingMethod",
+			message = arrayToList(
+				[
+					"Quick couldn't figure out what to do with [#arguments.missingMethodName#].",
+					"We tried checking columns, aliases, scopes, and relationships locally.",
+					"We also forwarded the call on to qb to see if it could do anything with it, but it couldn't."
+				],
+				" "
+			)
+		);
 	}
 
 	/**

models/QuickQB.cfc

@@ -1007,7 +1007,31 @@ component
 			return result;
 		}
 
-		return super.onMissingMethod( argumentCollection = arguments );
+		var qbResult = javacast( "null", "" );
+		var qbError  = {};
+		try {
+			qbResult = super.onMissingMethod( argumentCollection = arguments );
+		} catch ( QBMissingMethod e ) {
+			qbError = e;
+		}
+
+		if ( !isNull( qbResult ) ) {
+			return qbResult;
+		}
+
+		throw(
+			type    = "QuickMissingMethod",
+			message = arrayToList(
+				[
+					"Quick couldn't figure out what to do with [#arguments.missingMethodName#].",
+					qbError.keyExists( "message" ) ? "The error returned was: #qbError.message#" : "qb did not return a result.",
+					"We tried checking columns, aliases, scopes, and relationships locally.",
+					"We also forwarded the call on to qb to see if it could do anything with it, but it couldn't."
+				],
+				" "
+			),
+			extendedInfo = serializeJSON( qbError )
+		);
 	}
 
 	// override's super impl

tests/specs/integration/BaseEntity/ScopeSpec.cfc

@@ -2,6 +2,21 @@ component extends="tests.resources.ModuleIntegrationSpec" {
 
 	function run() {
 		describe( "Scope Spec", function() {
+			it( "surfaces the missing method inside a when callback", function() {
+				try {
+					getInstance( "User" ).when( true, function( q ) {
+						q.missingScopeInsideWhen();
+					} );
+				} catch ( any e ) {
+					expect( e.type ).toBe( "QuickMissingMethod" );
+					expect( e.message ).toInclude( "[missingScopeInsideWhen]" );
+					expect( e.message ).notToInclude( "[when]" );
+					return;
+				}
+
+				fail( "Expected a QuickMissingMethod exception" );
+			} );
+
 			it( "looks for missing methods as scopes", function() {
 				var users = getInstance( "User" ).latest().get();
 				expect( users ).toHaveLength( 5, "Five users should exist in the database and be returned." );