Add package parameter model.

Restructure Parameter models to use a common abstract base class.

shimatta_kenkyusho/parts/admin.py

@@ -9,6 +9,7 @@ admin.site.register(parts_models.Manufacturer)
 admin.site.register(parts_models.Storage)
 admin.site.register(parts_models.Stock)
 admin.site.register(parts_models.ComponentParameter)
+admin.site.register(parts_models.PackageParameter)
 admin.site.register(parts_models.ComponentParameterType)
 admin.site.register(parts_models.ComponentType)
 admin.site.register(parts_models.Distributor)

shimatta_kenkyusho/parts/migrations/0013_packageparameter.py

@@ -0,0 +1,49 @@
+# Generated by Django 5.1.3 on 2024-11-19 20:26
+
+import django.db.models.deletion
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("parts", "0012_storage_verbose_name"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PackageParameter",
+            fields=[
+                (
+                    "id",
+                    models.UUIDField(
+                        default=uuid.uuid4,
+                        editable=False,
+                        primary_key=True,
+                        serialize=False,
+                        unique=True,
+                    ),
+                ),
+                ("value", models.FloatField(default=0)),
+                ("text_value", models.TextField(blank=True)),
+                (
+                    "package",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE, to="parts.package"
+                    ),
+                ),
+                (
+                    "parameter_type",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="parts.componentparametertype",
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["id"],
+                "unique_together": {("package", "parameter_type")},
+            },
+        ),
+    ]

shimatta_kenkyusho/parts/models.py

@@ -238,24 +238,25 @@ class Component(models.Model):
 			sum = 0
 		return sum
 
-		
-class ComponentParameter(models.Model):
+class AbstractParameter(models.Model):
 	class Meta:
-		unique_together = ('component', 'parameter_type')
-		ordering = ['id']
+		abstract = True
+
 	id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True)
-	component = models.ForeignKey(Component, on_delete=models.CASCADE)  # A target component is required!
 	parameter_type = models.ForeignKey(ComponentParameterType, on_delete=models.CASCADE)
 	value = models.FloatField(default=0)
 	text_value = models.TextField(null=False, blank=True)
 
+	def _get_object_of_param(self):
+		return None
+
 	def __str__(self):
 		if self.parameter_type.parameter_type == 'F':
 			value = self.text_value
 		else:
 			value = str(self.value)
 
-		return str(self.component)+ ': '+ str(self.parameter_type) + ': ' + value
+		return str(self._get_object_of_param())+ ': '+ str(self.parameter_type) + ': ' + value
 
 	def resolved_value_as_string(self):
 		my_type = self.parameter_type.parameter_type
@@ -270,6 +271,24 @@ class ComponentParameter(models.Model):
 		elif my_type == 'F':
 			return self.text_value
 
+class ComponentParameter(AbstractParameter):
+	class Meta:
+		unique_together = ('component', 'parameter_type')
+		ordering = ['id']
+	component = models.ForeignKey(Component, on_delete=models.CASCADE)  # A target component is required!
+
+	def _get_object_of_param(self):
+		return self.component
+
+class PackageParameter(AbstractParameter):
+	class Meta:
+		unique_together = ('package', 'parameter_type')
+		ordering = ['id']
+	package = models.ForeignKey(Package, on_delete=models.CASCADE)
+	
+	def _get_object_of_param(self):
+		return self.package
+
 class Stock(models.Model):
 	class Meta:
 		unique_together = ('component', 'storage')