Added flag has_primary_key_set to Model

Now we know whether the primary key is defined or not
and we do not allow to make update/remove if the key is not defined.

And when doing insert/update we can put NULL if child models don't have
the primary key set (fields with has_foreign_key set to true).

Now in after_select() we should also set has_primary_key_set flag
or just call get_last_sequence_for_primary_key instead of get_last_sequence.

fixed: added prefix +00 when serializing PT::Date to PostgreSQL (time zone)
(for a column with a time zone there was a wrong value saved)

samples/attachment.h

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2019, Tomasz Sowa
+ * Copyright (c) 2019-2021, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -38,7 +38,7 @@
 #include <string>
 #include "morm.h"
 #include "type.h"
-
+#include "language.h"
 
 
 namespace morm
@@ -54,7 +54,7 @@ CREATE TABLE public.attachment (
     content text,
     some_flags bool,
     created_date timestamp with time zone,
-    bigint language_id,
+    language_id bigint,
 
     primary key(id)
 );
@@ -82,7 +82,6 @@ public:
 		field(L"name", name);
 		field(L"content", content);
 		field(L"attachment_id", L"types", types);
-		//field(L"types", types);
 		field(L"some_flags", some_flags);
 		field(L"created_date", created_date);
 		field(L"language_id", L"language", language);
@@ -94,9 +93,18 @@ public:
 		stream << "public.attachment";
 	}
 
+	void after_select()
+	{
+		if( has_primary_key_set )
+		{
+			morm::Finder<Type> finder(model_connector);
+			types = finder.select().where().eq(L"attachment_id", id).get_vector();
+		}
+	}
+
 	void after_insert()
 	{
-		get_last_sequence(L"public.attachment_id_seq", id);
+		get_last_sequence_for_primary_key(L"public.attachment_id_seq", id);
 	}