DB: Na MOEnum zavádíme obecné metody choices a coerce

Pro použití ve formulářích, coerce slouží k převodu stringu na objekt Enumu.

mo/db.py

@@ -38,6 +38,22 @@ class MOEnum(str, PythonEnum):
     def _generate_next_value_(name, start, count, last_values):
         return name
 
+    @classmethod
+    def choices(enum):
+        out = []
+        for item in enum:
+            out.append((item.name, item.friendly_name()))
+        return out
+
+    @classmethod
+    def coerce(enum, name):
+        if isinstance(name, enum):
+            return name
+        try:
+            return enum[name]
+        except KeyError:
+            raise ValueError(name)
+
 
 class PlaceType(MOEnum):
     region = auto()
@@ -55,15 +71,6 @@ class PlaceType(MOEnum):
                 out.append((item.name, name))
         return out
 
-    @classmethod
-    def coerce(enum, name):
-        if isinstance(name, enum):
-            return name
-        try:
-            return enum[name]
-        except KeyError:
-            raise ValueError(name)
-
 
 # list of allowed levels
 place_type_names_and_levels = {
@@ -233,13 +240,6 @@ class PartState(MOEnum):
     present = auto()
     absent = auto()
 
-    @classmethod
-    def choices(enum):
-        out = []
-        for item in enum:
-            out.append((item.name, item.friendly_name()))
-        return out
-
     def friendly_name(self) -> str:
         return part_state_names[self]