feat: first version.

entgo/mixin/autoincrement_id.go

@@ -0,0 +1,39 @@
+package mixin
+
+import (
+	"entgo.io/contrib/entproto"
+	"entgo.io/ent"
+	"entgo.io/ent/dialect"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/index"
+	"entgo.io/ent/schema/mixin"
+)
+
+var _ ent.Mixin = (*AutoIncrementId)(nil)
+
+type AutoIncrementId struct{ mixin.Schema }
+
+func (AutoIncrementId) Fields() []ent.Field {
+	return []ent.Field{
+		field.Uint32("id").
+			Comment("id").
+			StructTag(`json:"id,omitempty"`).
+			SchemaType(map[string]string{
+				dialect.MySQL:    "int",
+				dialect.Postgres: "serial",
+			}).
+			Annotations(
+				entproto.Field(1),
+			).
+			Positive().
+			Immutable().
+			Unique(),
+	}
+}
+
+// Indexes of the AutoIncrementId.
+func (AutoIncrementId) Indexes() []ent.Index {
+	return []ent.Index{
+		index.Fields("id"),
+	}
+}