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/attachment2.h

@@ -0,0 +1,120 @@
+/*
+ * This file is a part of morm
+ * and is distributed under the 2-Clause BSD licence.
+ * Author: Tomasz Sowa <t.sowa@ttmath.org>
+ */
+
+/*
+ * Copyright (c) 2021, Tomasz Sowa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef headerfile_morm_samples_attachment2
+#define headerfile_morm_samples_attachment2
+
+#include <string>
+#include "morm.h"
+#include "type.h"
+#include "language.h"
+
+
+namespace morm
+{
+namespace samples
+{
+
+/*
+CREATE TABLE public.attachment2 (
+    id bigserial,
+    person_id bigint,
+    name varchar(64),
+    content text,
+    some_flags bool,
+    created_date timestamp with time zone,
+    language_id bigint,
+
+    primary key(id)
+);
+*/
+
+// copied from Attachment and changed the table name
+class Attachment2 : public morm::Model
+{
+public:
+
+	long id;
+	long person_id;
+	std::wstring name;
+	std::string content;
+	std::vector<Type> types;
+	bool some_flags;
+	PT::Date created_date;
+	Language language;
+
+
+	void map_fields()
+	{
+		field(L"id", id, false, false, true);
+		field(L"person_id", person_id);
+		field(L"name", name);
+		field(L"content", content);
+		field(L"attachment_id", L"types", types);
+		field(L"some_flags", some_flags);
+		field(L"created_date", created_date);
+		field(L"language_id", L"language", language);
+	}
+
+	void table_name(PT::TextStream & stream)
+	{
+		// schema.table_name or just table_name
+		stream << "public.attachment2";
+	}
+
+	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_for_primary_key(L"public.attachment2_id_seq", id);
+	}
+
+
+};
+
+
+
+}
+}
+
+
+#endif
+