* #104: Change Pluck/PluckMap to return slice/map of structs (#105)

Add common abstract method with EachToStruct processing data
Add more tests to cover errs

- Remove outdated Get method

Author: arthurkushman

README.md

@@ -34,6 +34,7 @@ library [![Tweet](http://jpillora.com/github-twitter-button/img/tweet.png)](http
 * [Create table](#user-content-create-table)
 * [Add / Modify / Drop columns](#user-content-add--modify--drop-columns)
 * [Chunking Results](#user-content-chunking-results)
+* [Pluck / PluckMap](#user-content-pluck--pluckmap)
 
 ## Installation
 
@@ -438,7 +439,7 @@ dataStruct := &DataStructUser{}
 err = db.Table(UsersTable).Select("name", "points").Chunk(dataStruct, 100, func(users []any) bool {
     for _, v := range users {
         user := v.(DataStructUser) 
-		// your code goes here e.g.:
+        // your code goes here e.g.:
         sumOfPoints += user.Points
     }
 
@@ -447,6 +448,28 @@ err = db.Table(UsersTable).Select("name", "points").Chunk(dataStruct, 100, func(
 })
 ```
 
+## Pluck / PluckMap
+
+If you would like to get values of a particular column(s) of a struct and place them into slice - use `Pluck` method:
+```go
+    dataStruct := &DataStructUser{}
+    res, err := db.Table(UsersTable).Pluck(dataStruct)
+    for k, v := range res {
+        val := v.(DataStructUser)
+        fmt.Println(val.Name) // f.e.: Alex Shmidt
+    }
+	
+    // or use a PluckMap method to aggregate key/value pairs to a map
+    res, err := db.Table(UsersTable).PluckMap(dataStruct, "name", "points")
+    for k, m := range res {
+        for key, value := range m {
+            keyVal := key.(string)
+            valueVal := value.(DataStructUser) 
+            // rest of the code ...
+        }
+    }
+```
+
 PS Why use buildsqlx? Because it is simple and fast, yet versatile. The builder code-style has been inherited from greatest web-frameworks, so u can easily query anything from db. 
 
 Supporters gratitude:

advanced.go

@@ -33,32 +33,35 @@ func (r *DB) Find(src any, id uint64) error {
 	return r.Where("id", "=", id).First(src)
 }
 
-// Pluck getting values of a particular column and place them into slice
-func (r *DB) Pluck(column string) (val []interface{}, err error) {
-	res, err := r.Get()
+// Pluck getting values of a particular column(s) of a struct and place them into slice
+func (r *DB) Pluck(src any) ([]any, error) {
+	res, err := r.eachToStructRows(src, r.Builder.offset, r.Builder.limit)
 	if err != nil {
 		return nil, err
 	}
 
-	val = make([]interface{}, len(res))
-	for k, m := range res {
-		val[k] = m[column]
-	}
-
-	return
+	return res, nil
 }
 
 // PluckMap getting values of a particular key/value columns and place them into map
-func (r *DB) PluckMap(colKey, colValue string) (val []map[interface{}]interface{}, err error) {
-	res, err := r.Get()
+// values of the returning map is a structure passed as src and filled with data from DB
+func (r *DB) PluckMap(src any, colKey, colValue string) (val []map[any]any, err error) {
+	resource := reflect.ValueOf(src).Elem()
+	if err = validateFields(resource, src, []string{colKey, colValue}); err != nil {
+		return nil, err
+	}
+
+	res, err := r.eachToStructRows(src, r.Builder.offset, r.Builder.limit)
 	if err != nil {
 		return nil, err
 	}
 
-	val = make([]map[interface{}]interface{}, len(res))
+	val = make([]map[any]any, len(res))
 	for k, m := range res {
-		val[k] = make(map[interface{}]interface{})
-		val[k][m[colKey]] = m[colValue]
+		val[k] = make(map[any]any)
+
+		fieldKeyData := getFieldValue(m, colKey)
+		val[k][fieldKeyData] = reflect.ValueOf(m).Interface()
 	}
 
 	return
@@ -99,8 +102,8 @@ func (r *DB) Decrement(column string, on uint64) (int64, error) {
 
 // increments or decrements depending on sign
 func (r *DB) incrDecr(column, sign string, on uint64) (int64, error) {
-	builder := r.Builder
-	if builder.table == "" {
+	bldr := r.Builder
+	if bldr.table == "" {
 		return 0, errTableCallBeforeOp
 	}
 

aggregates.go

@@ -2,49 +2,49 @@ package buildsqlx
 
 // Count counts resulting rows based on clause
 func (r *DB) Count() (cnt int64, err error) {
-	builder := r.Builder
-	builder.columns = []string{"COUNT(*)"}
-	query := builder.buildSelect()
+	bldr := r.Builder
+	bldr.columns = []string{"COUNT(*)"}
+	query := bldr.buildSelect()
 	err = r.Sql().QueryRow(query, prepareValues(r.Builder.whereBindings)...).Scan(&cnt)
 
 	return
 }
 
 // Avg calculates average for specified column
 func (r *DB) Avg(column string) (avg float64, err error) {
-	builder := r.Builder
-	builder.columns = []string{"AVG(" + column + ")"}
-	query := builder.buildSelect()
+	bldr := r.Builder
+	bldr.columns = []string{"AVG(" + column + ")"}
+	query := bldr.buildSelect()
 	err = r.Sql().QueryRow(query, prepareValues(r.Builder.whereBindings)...).Scan(&avg)
 
 	return
 }
 
 // Min calculates minimum for specified column
 func (r *DB) Min(column string) (min float64, err error) {
-	builder := r.Builder
-	builder.columns = []string{"MIN(" + column + ")"}
-	query := builder.buildSelect()
+	bldr := r.Builder
+	bldr.columns = []string{"MIN(" + column + ")"}
+	query := bldr.buildSelect()
 	err = r.Sql().QueryRow(query, prepareValues(r.Builder.whereBindings)...).Scan(&min)
 
 	return
 }
 
 // Max calculates maximum for specified column
 func (r *DB) Max(column string) (max float64, err error) {
-	builder := r.Builder
-	builder.columns = []string{"MAX(" + column + ")"}
-	query := builder.buildSelect()
+	bldr := r.Builder
+	bldr.columns = []string{"MAX(" + column + ")"}
+	query := bldr.buildSelect()
 	err = r.Sql().QueryRow(query, prepareValues(r.Builder.whereBindings)...).Scan(&max)
 
 	return
 }
 
 // Sum calculates sum for specified column
 func (r *DB) Sum(column string) (sum float64, err error) {
-	builder := r.Builder
-	builder.columns = []string{"SUM(" + column + ")"}
-	query := builder.buildSelect()
+	bldr := r.Builder
+	bldr.columns = []string{"SUM(" + column + ")"}
+	query := bldr.buildSelect()
 	err = r.Sql().QueryRow(query, prepareValues(r.Builder.whereBindings)...).Scan(&sum)
 
 	return