Added meta as a JSON field on the Entity table

Metadata attributes can now be defined and overridden on the object
itself, as well as on the database. Note that db settings will always
take priority in case of value conflicts.

platypush/entities/_base.py

@@ -35,6 +35,7 @@ class Entity(Base):
     type = Column(String, nullable=False, index=True)
     plugin = Column(String, nullable=False)
     data = Column(JSON, default=dict)
+    meta = Column(JSON, default=dict)
     created_at = Column(
         DateTime(timezone=False), default=datetime.utcnow(), nullable=False
     )
@@ -51,9 +52,8 @@ class Entity(Base):
         'polymorphic_on': type,
     }
 
-    @classmethod
     @property
-    def meta(cls) -> Mapping:
+    def _meta(self) -> dict:
         return {
             'icon_class': 'fa-solid fa-circle-question',
         }
@@ -75,7 +75,10 @@ class Entity(Base):
     def to_json(self) -> dict:
         return {
             **{col.key: self._serialize_value(col) for col in self.columns},
-            'meta': self.meta,
+            'meta': {
+                **self._meta,
+                **(self.meta or {}),
+            },
         }
 
     def get_plugin(self):

platypush/entities/devices.py

@@ -12,9 +12,9 @@ class Device(Entity):
         'polymorphic_identity': __tablename__,
     }
 
-    @classmethod
     @property
-    def meta(cls):
+    def _meta(self):
         return {
+            **super()._meta,
             'icon_class': 'fa-solid fa-gear',
         }

platypush/entities/lights.py

@@ -12,9 +12,9 @@ class Light(Device):
         'polymorphic_identity': __tablename__,
     }
 
-    @classmethod
     @property
-    def meta(cls):
+    def _meta(self):
         return {
+            **super()._meta,
             'icon_class': 'fa-solid fa-lightbulb',
         }

platypush/entities/switches.py

@@ -13,10 +13,10 @@ class Switch(Device):
         'polymorphic_identity': __tablename__,
     }
 
-    @classmethod
     @property
-    def meta(cls):
+    def _meta(self):
         return {
+            **super()._meta,
             'icon_class': 'fa-solid fa-light-switch',
         }