Add ActionCode primitive type. Fix constraint checking.

services/primitives/actioncode_type.py

@@ -0,0 +1,24 @@
+from uuid import UUID
+from state.base import State
+from services.bottom.V0 import Bottom
+
+
+class ActionCode:
+    def __init__(self, model: UUID, state: State):
+        self.model = model
+        self.bottom = Bottom(state)
+        type_model_id_node, = self.bottom.read_outgoing_elements(state.read_root(), "ActionCode")
+        self.type_model = UUID(self.bottom.read_value(type_model_id_node))
+
+    def create(self, value: str):
+        if "code" in self.bottom.read_keys(self.model):
+            instance, = self.bottom.read_outgoing_elements(self.model, "code")
+            self.bottom.delete_element(instance)
+        _instance = self.bottom.create_node(value)
+        self.bottom.create_edge(self.model, _instance, "code")
+        _type, = self.bottom.read_outgoing_elements(self.type_model, "ActionCode")
+        self.bottom.create_edge(_instance, _type, "Morphism")
+
+    def read(self):
+        instance, = self.bottom.read_outgoing_elements(self.model, "code")
+        return self.bottom.read_value(instance)