Scenarios: Add scenarios table in db and default scenario in study.

src/Model/Scenarios.py

@@ -0,0 +1,60 @@
+# Scenarios.py -- Pamhyr
+# Copyright (C) 2024  INRAE
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# -*- coding: utf-8 -*-
+
+from tools import logger_exception
+
+from Model.Tools.PamhyrDict import PamhyrModelDict
+from Model.Scenario import Scenario
+
+class Scenarios(PamhyrModelDict):
+    _sub_classes = [
+        Scenario,
+    ]
+
+    @classmethod
+    def _db_load(cls, execute, data=None):
+        new = cls(status=data["status"])
+
+        new._dict = Scenario._db_load(
+            execute,
+            data=data
+        )
+
+        return new
+
+    def _db_save(self, execute, data=None):
+        ok = True
+        if data is None:
+            data = {}
+
+        scenarios = self._dict
+        for sid in scenarios:
+            ok &= scenarios[sid]._db_save(execute, data)
+
+        return ok
+
+    def get(self, key):
+        if key in self._dict:
+            return self._dict[key]
+
+        return None
+
+    def new(self, parent):
+        new = Scenario(parent=parent, status=self._status)
+        self.set(new._id, new)
+        return new