change to union multiple from, not combine them as sub-fields

demo/test/test.yaml

@@ -10,4 +10,12 @@ fields:
 
   - field: test1
     range: [userA,a-z,1-9,1-10000] # 字面常量及列表
+    postfix: "\t"
+
+  - field: field_use_instance
+    froms:
+      - from: ip.v1.yaml
+        use: privateC,privateB
+      - from: ip.v1.yaml
+        use: privateC,privateB
     postfix: "\t"
\ No newline at end of file

src/gen/generator.go

@@ -84,23 +84,21 @@ func GenerateForField(field *model.DefField, withFix bool) (values []string) {
 		values = loopFieldValues(field, values, count, true)
 
 	} else if len(field.Froms) > 0 { // from muti items
-		arrOfArr := make([][]string, 0) // 2 dimension arr for child, [ [a,b,c], [1,2,3] ]
+		unionValues := make([]string, 0) // 2 dimension arr for child, [ [a,b,c], [1,2,3] ]
 		for _, child := range field.Froms {
 			if child.From == "" {
 				child.From = field.From
 			}
 
 			childValues := GenerateForField(&child, withFix)
-			arrOfArr = append(arrOfArr, childValues)
+			unionValues = append(unionValues, childValues...)
 		}
 
-		count := vari.Total
-		count = getRecordCount(arrOfArr)
+		count := len(unionValues)
 		if count > vari.Total {
 			count = vari.Total
 		}
-		values = combineChildrenValues(arrOfArr, count)
-		values = loopFieldValues(field, values, count, true)
+		values = loopFieldValues(field, unionValues, count, true)
 
 	} else if field.From != "" { // refer to res
 

src/gen/res.go

@@ -155,7 +155,7 @@ func prepareNestedInstanceRes(insts model.ResInsts, inst model.ResInst, instFiel
 
 	if instField.Use != "" { // refer to another instances or ranges
 		if vari.Res[instField.From] == nil {
-			referencedRanges, referencedInstants := getRootRangeOrInstant(instField)
+			referencedRanges, referencedInstants := getreferencedRangeOrInstant(instField)
 			groupedValueReferenced := map[string][]string{}
 
 			if len(referencedRanges.Ranges) > 0 { // refer to ranges
@@ -184,7 +184,7 @@ func prepareNestedInstanceRes(insts model.ResInsts, inst model.ResInst, instFiel
 	}
 }
 
-func getRootRangeOrInstant(inst model.DefField) (referencedRanges model.ResRanges, referencedInsts model.ResInsts) {
+func getreferencedRangeOrInstant(inst model.DefField) (referencedRanges model.ResRanges, referencedInsts model.ResInsts) {
 	resFile, _, _ := fileUtils.GetResProp(inst.From)
 
 	yamlContent, err := ioutil.ReadFile(resFile)