feature: src tag

[zhuliquan]

some times, mask may using json field. this feature we can copy according to field's tag of src object. useage：

type A struct {
    Field1 string
    Field2 int `db:"some_field"`
}
type B struct {
    Field1 string `struct:"a_name"`
    A      A      `db:"another_name"`
}
src := &B{
    Field1: "B Field1",
    A: A{
        Field1: "A Field 1",
        Field2: 1,
    },
}
mask, _ = fieldmask_utils.MaskFromPaths([]string{"Field1","another_name.some_field"}, func(s string) string {return s})
dst := make(map[string]interface{})
err = fieldmask_utils.StructToMap(mask, src, dst, fieldmask_utils.WithSrcTag("db"))
fmt.Println(err)
// dst is map[string]interface{}{
//  "Field1": src.Field1,
//  "another_name": map[string]interface{}{
//      "some_field": src.A.Field2,
//  },
// }
fmt.Println(dst)

[codecov[bot]]

Codecov Report

Merging #38 (8d44d57) into master (f9573a9) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   86.61%   86.72%   +0.11%     
==========================================
  Files           2        2              
  Lines         478      482       +4     
==========================================
+ Hits          414      418       +4     
  Misses         46       46              
  Partials       18       18              

Files Changed	Coverage Δ
copy.go	83.38% <100.00%> (+0.19%)	:arrow_up:

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[zhuliquan]

Thanks for reviewing, I have modified the code according to your suggestions.

[mennanov]

Thanks!