Added empty spool weight as an option field for the vendor

spoolman/database/filament.py

@@ -48,6 +48,9 @@ async def create(
     vendor_item: Optional[models.Vendor] = None
     if vendor_id is not None:
         vendor_item = await vendor.get_by_id(db, vendor_id)
+        # default spool weight from vendor
+        if spool_weight is None and vendor_item.empty_spool_weight is not None:
+            spool_weight = vendor_item.empty_spool_weight
 
     filament = models.Filament(
         name=name,

spoolman/database/models.py

@@ -18,6 +18,7 @@ class Vendor(Base):
     id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
     registered: Mapped[datetime] = mapped_column()
     name: Mapped[str] = mapped_column(String(64))
+    empty_spool_weight: Mapped[Optional[float]] = mapped_column(comment="The weight of an empty spool.")
     comment: Mapped[Optional[str]] = mapped_column(String(1024))
     filaments: Mapped[list["Filament"]] = relationship(back_populates="vendor")
     extra: Mapped[list["VendorField"]] = relationship(
@@ -64,8 +65,8 @@ class Spool(Base):
     price: Mapped[Optional[float]] = mapped_column()
     filament_id: Mapped[int] = mapped_column(ForeignKey("filament.id"))
     filament: Mapped["Filament"] = relationship(back_populates="spools")
-    initial_weight: Mapped[float] = mapped_column()
-    empty_weight: Mapped[float] = mapped_column()
+    initial_weight: Mapped[Optional[float]] = mapped_column()
+    empty_weight: Mapped[Optional[float]] = mapped_column()
     used_weight: Mapped[float] = mapped_column()
     location: Mapped[Optional[str]] = mapped_column(String(64))
     lot_nr: Mapped[Optional[str]] = mapped_column(String(64))

spoolman/database/spool.py

@@ -235,6 +235,7 @@ async def use_weight_safe(db: AsyncSession, spool_id: int, weight: float) -> Non
         db (AsyncSession): Database session
         spool_id (int): Spool ID
         weight (float): Filament weight to consume, in grams
+
     """
     await db.execute(
         sqlalchemy.update(models.Spool)
@@ -261,6 +262,7 @@ async def use_weight(db: AsyncSession, spool_id: int, weight: float) -> models.S
 
     Returns:
         models.Spool: Updated spool object
+
     """
     await use_weight_safe(db, spool_id, weight)
 
@@ -288,6 +290,7 @@ async def use_length(db: AsyncSession, spool_id: int, length: float) -> models.S
 
     Returns:
         models.Spool: Updated spool object
+
     """
     # Get filament diameter and density
     result = await db.execute(