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/field.go

@@ -0,0 +1,117 @@
+package schema
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/uptrace/bun/dialect"
+	"github.com/uptrace/bun/internal/tagparser"
+)
+
+type Field struct {
+	StructField reflect.StructField
+
+	Tag          tagparser.Tag
+	IndirectType reflect.Type
+	Index        []int
+
+	Name    string // SQL name, .e.g. id
+	SQLName Safe   // escaped SQL name, e.g. "id"
+	GoName  string // struct field name, e.g. Id
+
+	DiscoveredSQLType  string
+	UserSQLType        string
+	CreateTableSQLType string
+	SQLDefault         string
+
+	OnDelete string
+	OnUpdate string
+
+	IsPK          bool
+	NotNull       bool
+	NullZero      bool
+	AutoIncrement bool
+
+	Append AppenderFunc
+	Scan   ScannerFunc
+	IsZero IsZeroerFunc
+}
+
+func (f *Field) String() string {
+	return f.Name
+}
+
+func (f *Field) Clone() *Field {
+	cp := *f
+	cp.Index = cp.Index[:len(f.Index):len(f.Index)]
+	return &cp
+}
+
+func (f *Field) Value(strct reflect.Value) reflect.Value {
+	return fieldByIndexAlloc(strct, f.Index)
+}
+
+func (f *Field) HasZeroValue(v reflect.Value) bool {
+	for _, idx := range f.Index {
+		if v.Kind() == reflect.Ptr {
+			if v.IsNil() {
+				return true
+			}
+			v = v.Elem()
+		}
+		v = v.Field(idx)
+	}
+	return f.IsZero(v)
+}
+
+func (f *Field) AppendValue(fmter Formatter, b []byte, strct reflect.Value) []byte {
+	fv, ok := fieldByIndex(strct, f.Index)
+	if !ok {
+		return dialect.AppendNull(b)
+	}
+
+	if f.NullZero && f.IsZero(fv) {
+		return dialect.AppendNull(b)
+	}
+	if f.Append == nil {
+		panic(fmt.Errorf("bun: AppendValue(unsupported %s)", fv.Type()))
+	}
+	return f.Append(fmter, b, fv)
+}
+
+func (f *Field) ScanWithCheck(fv reflect.Value, src interface{}) error {
+	if f.Scan == nil {
+		return fmt.Errorf("bun: Scan(unsupported %s)", f.IndirectType)
+	}
+	return f.Scan(fv, src)
+}
+
+func (f *Field) ScanValue(strct reflect.Value, src interface{}) error {
+	if src == nil {
+		if fv, ok := fieldByIndex(strct, f.Index); ok {
+			return f.ScanWithCheck(fv, src)
+		}
+		return nil
+	}
+
+	fv := fieldByIndexAlloc(strct, f.Index)
+	return f.ScanWithCheck(fv, src)
+}
+
+func (f *Field) markAsPK() {
+	f.IsPK = true
+	f.NotNull = true
+	f.NullZero = true
+}
+
+func indexEqual(ind1, ind2 []int) bool {
+	if len(ind1) != len(ind2) {
+		return false
+	}
+	for i, ind := range ind1 {
+		if ind != ind2[i] {
+			return false
+		}
+	}
+	return true
+}