Refactor record repo

pkg/rh/squirrel_fn.go

@@ -1,6 +1,8 @@
 package rh
 
 import (
+	"strings"
+
 	"gopkg.in/Masterminds/squirrel.v1"
 )
 
@@ -44,3 +46,37 @@ func (f squirrelFunction) ToSql() (sql string, args []interface{}, err error) {
 
 	return
 }
+
+type (
+	squirrelConcatExpr struct {
+		parts []string
+		args  []interface{}
+		err   error
+	}
+)
+
+func SquirrelConcatExpr(args ...interface{}) squirrel.Sqlizer {
+	var w = new(squirrelConcatExpr)
+
+	for _, a := range args {
+		if w.err != nil {
+			break
+		}
+
+		switch o := a.(type) {
+		case string:
+			w.parts = append(w.parts, o)
+		case squirrel.Sqlizer:
+			p, a, err := o.ToSql()
+			w.parts = append(w.parts, p)
+			w.args = append(w.args, a...)
+			w.err = err
+		}
+	}
+
+	return w
+}
+
+func (w *squirrelConcatExpr) ToSql() (string, []interface{}, error) {
+	return strings.Join(w.parts, ""), w.args, w.err
+}