From 22ff8377dfaf208c1db8cb4923a481990f7e76a5 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Tue, 9 Jun 2020 15:34:55 +0800
Subject: [PATCH] Fix Pluck with Table only

---
 finisher_api.go        | 16 ++++++++--------
 scan.go                | 34 ++++++++++++++++++----------------
 tests/distinct_test.go |  2 +-
 3 files changed, 27 insertions(+), 25 deletions(-)

diff --git a/finisher_api.go b/finisher_api.go
index fc21e490..d45c6c4f 100644
--- a/finisher_api.go
+++ b/finisher_api.go
@@ -289,16 +289,16 @@ func (db *DB) Pluck(column string, dest interface{}) (tx *DB) {
 				column = f.DBName
 			}
 		}
-
-		tx.Statement.AddClauseIfNotExists(clause.Select{
-			Distinct: tx.Statement.Distinct,
-			Columns:  []clause.Column{{Name: column}},
-		})
-		tx.Statement.Dest = dest
-		tx.callbacks.Query().Execute(tx)
-	} else {
+	} else if tx.Statement.Table == "" {
 		tx.AddError(ErrorModelValueRequired)
 	}
+
+	tx.Statement.AddClauseIfNotExists(clause.Select{
+		Distinct: tx.Statement.Distinct,
+		Columns:  []clause.Column{{Name: column}},
+	})
+	tx.Statement.Dest = dest
+	tx.callbacks.Query().Execute(tx)
 	return
 }
 
diff --git a/scan.go b/scan.go
index f1cdb2e5..1f0aacd0 100644
--- a/scan.go
+++ b/scan.go
@@ -84,24 +84,26 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 
 			db.Statement.ReflectValue.Set(reflect.MakeSlice(db.Statement.ReflectValue.Type(), 0, 0))
 
-			for idx, column := range columns {
-				if field := db.Statement.Schema.LookUpField(column); field != nil && field.Readable {
-					fields[idx] = field
-				} else if names := strings.Split(column, "__"); len(names) > 1 {
-					if len(joinFields) == 0 {
-						joinFields = make([][2]*schema.Field, len(columns))
-					}
-
-					if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
-						if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
-							fields[idx] = field
-							joinFields[idx] = [2]*schema.Field{rel.Field, field}
-							continue
+			if db.Statement.Schema != nil {
+				for idx, column := range columns {
+					if field := db.Statement.Schema.LookUpField(column); field != nil && field.Readable {
+						fields[idx] = field
+					} else if names := strings.Split(column, "__"); len(names) > 1 {
+						if len(joinFields) == 0 {
+							joinFields = make([][2]*schema.Field, len(columns))
 						}
+
+						if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
+							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
+								fields[idx] = field
+								joinFields[idx] = [2]*schema.Field{rel.Field, field}
+								continue
+							}
+						}
+						values[idx] = &sql.RawBytes{}
+					} else {
+						values[idx] = &sql.RawBytes{}
 					}
-					values[idx] = &sql.RawBytes{}
-				} else {
-					values[idx] = &sql.RawBytes{}
 				}
 			}
 
diff --git a/tests/distinct_test.go b/tests/distinct_test.go
index f5a969a8..248602d3 100644
--- a/tests/distinct_test.go
+++ b/tests/distinct_test.go
@@ -21,7 +21,7 @@ func TestDistinct(t *testing.T) {
 	}
 
 	var names []string
-	DB.Model(&User{}).Where("name like ?", "distinct%").Order("name").Pluck("Name", &names)
+	DB.Table("users").Where("name like ?", "distinct%").Order("name").Pluck("name", &names)
 	AssertEqual(t, names, []string{"distinct", "distinct", "distinct", "distinct-2", "distinct-3"})
 
 	var names1 []string