Pg to bun (#148)

* start moving to bun

* changing more stuff

* more

* and yet more

* tests passing

* seems stable now

* more big changes

* small fix

* little fixes

vendor/github.com/uptrace/bun/schema/relation.go

@@ -0,0 +1,32 @@
+package schema
+
+import (
+	"fmt"
+)
+
+const (
+	InvalidRelation = iota
+	HasOneRelation
+	BelongsToRelation
+	HasManyRelation
+	ManyToManyRelation
+)
+
+type Relation struct {
+	Type       int
+	Field      *Field
+	JoinTable  *Table
+	BaseFields []*Field
+	JoinFields []*Field
+
+	PolymorphicField *Field
+	PolymorphicValue string
+
+	M2MTable      *Table
+	M2MBaseFields []*Field
+	M2MJoinFields []*Field
+}
+
+func (r *Relation) String() string {
+	return fmt.Sprintf("relation=%s", r.Field.GoName)
+}