fix: This operation is only valid on generic types and InternalGet returning all table records due to GetPredicate not returning the correct predicate.

Related PR on tmsmith/DapperExtensions (tmsmith#325)

Author: lenerson

DapperExtensions/DapperImplementor.cs

@@ -288,7 +288,7 @@ protected static IPredicate GetPredicate(IClassMapper classMap, object predicate
             var wherePredicate = predicate as IPredicate;
             if (wherePredicate == null && predicate != null)
             {
-                wherePredicate = GetEntityPredicate(classMap, predicate);
+                wherePredicate = GetIdPredicate(classMap, predicate);
             }
 
             return wherePredicate;
@@ -505,7 +505,14 @@ protected virtual DynamicParameters AddParameter<T>(T entity, DynamicParameters
 
             parameters ??= new DynamicParameters();
 
-            if (prop.MemberInfo.DeclaringType == typeof(bool) || (prop.MemberInfo.DeclaringType.IsGenericType && prop.MemberType.GetGenericTypeDefinition() == typeof(Nullable<>) && prop.MemberInfo.DeclaringType.GetGenericArguments()[0] == typeof(bool)))
+            if (
+                prop.MemberInfo.DeclaringType == typeof(bool) || (
+                    prop.MemberInfo.DeclaringType.IsGenericType &&
+                    prop.MemberType.IsGenericType &&
+                    prop.MemberType.GetGenericTypeDefinition() == typeof(Nullable<>) &&
+                    prop.MemberInfo.DeclaringType.GetGenericArguments()[0] == typeof(bool)
+                )
+            )
             {
                 var value = (bool?)propValue;
                 if (!value.HasValue)