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Change tags of structures' fields in runtime without copying of data in Go. Conditional marshalling and unmarshalling.

License: MIT License

Go 100.00%

golang go library struct tags

retag's Introduction

Retag

Package retag provides an ability to change tags of structures' fields in runtime without copying of the data. It may be helpful in next cases:

Automatic tags generation;
Different views of the one data;
Fixing of leaky abstractions with minimal boilerplate code when application has layers of abstractions and model is separated from storages and presentation layers.

Please see examples in documentation for details.

Features:

No memory allocations (for cached types);
Fast converting (lookup in table and pointer creation for cached types);
Works with complex and nested types (e.g. map[struct]*struct).

The package requires go1.7+.

Installation

go get github.com/sevlyar/retag

You can use gopkg.in:

go get gopkg.in/sevlyar/retag.v0

Documentation

Please see godoc.org/github.com/sevlyar/retag

retag's People

Contributors

Stargazers

Watchers

Forkers

codyaray alholm maseer qwerev borudar domwong yflau admpub slowaner pangeacyber nomadhills-playground nmbr7 jarrodhroberson

retag's Issues

Support custom un(marshalers) of structures

Now Convert drops methods of structures and custom marshalers (like MarshalJSON) don't work.

Add a way to use custom (un)marshalers with the library.

error type out of range when use for embed fields

hi
tnx for good package.

when I run this code:

       type Product struct {
		gorm.Model `view:"gorm"`
		Code string `view:"*"`
		Price uint `view:"*"`

	}


	product := &Product{}

	gormProduct := retag.Convert(product, retag.NewView("json", "gorm"))

	fmt.Println(gormProduct, reflect.TypeOf(gormProduct))

output error is:

runtime: typeOff 0xffffffffffffffed base 0xc4200ac700 not in ranges:
	types 0x66f000 etypes 0x72154c
fatal error: runtime: type offset base pointer out of range

goroutine 1 [running]:
runtime.throw(0x705437, 0x2e)
	/usr/local/go/src/runtime/panic.go:596 +0x95 fp=0xc42015d160 sp=0xc42015d140
runtime.resolveTypeOff(0xc4200ac700, 0xffffffed, 0x671d87)
	/usr/local/go/src/runtime/type.go:223 +0x350 fp=0xc42015d1c0 sp=0xc42015d160
runtime.(*_type).typeOff(0xc4200ac700, 0xffffffed, 0x671d87)
	/usr/local/go/src/runtime/type.go:239 +0x33 fp=0xc42015d1e8 sp=0xc42015d1c0
runtime.additab(0x7f2f9e916440, 0x101)
	/usr/local/go/src/runtime/iface.go:112 +0x1e2 fp=0xc42015d2d0 sp=0xc42015d1e8
runtime.getitab(0x6b6840, 0xc4200ac700, 0x4a1701, 0xc4200ac700)
	/usr/local/go/src/runtime/iface.go:79 +0x184 fp=0xc42015d368 sp=0xc42015d2d0
runtime.assertE2I2(0x6b6840, 0xc4200ac700, 0xc42014d880, 0x0, 0x0, 0x0)
	/usr/local/go/src/runtime/iface.go:294 +0x43 fp=0xc42015d398 sp=0xc42015d368
fmt.(*pp).handleMethods(0xc4200b63c0, 0xc400000076, 0x100)
	/usr/local/go/src/fmt/print.go:560 +0x70 fp=0xc42015d428 sp=0xc42015d398
fmt.(*pp).printValue(0xc4200b63c0, 0xc4200ac700, 0xc42012b6e8, 0x199, 0xc400000076, 0x3)
	/usr/local/go/src/fmt/print.go:695 +0x2d6b fp=0xc42015d620 sp=0xc42015d428
fmt.(*pp).printValue(0xc4200b63c0, 0xc42012b7a0, 0xc42012b6e0, 0x199, 0xc400000076, 0x2)
	/usr/local/go/src/fmt/print.go:778 +0x21de fp=0xc42015d818 sp=0xc42015d620
fmt.(*pp).printValue(0xc4200b63c0, 0xc42012b800, 0xc42012b6e0, 0x199, 0xc400000076, 0x1)
	/usr/local/go/src/fmt/print.go:778 +0x21de fp=0xc42015da10 sp=0xc42015d818
fmt.(*pp).printValue(0xc4200b63c0, 0xc42014f5c0, 0xc42012b6e0, 0x16, 0x76, 0x0)
	/usr/local/go/src/fmt/print.go:848 +0x1dd1 fp=0xc42015dc08 sp=0xc42015da10
fmt.(*pp).printArg(0xc4200b63c0, 0xc42014f5c0, 0xc42012b6e0, 0x76)
	/usr/local/go/src/fmt/print.go:682 +0x217 fp=0xc42015dc90 sp=0xc42015dc08
fmt.(*pp).doPrintln(0xc4200b63c0, 0xc42015de68, 0x1, 0x1)
	/usr/local/go/src/fmt/print.go:1138 +0xa1 fp=0xc42015dd08 sp=0xc42015dc90
fmt.Fprintln(0x826fc0, 0xc42008e008, 0xc42015de68, 0x1, 0x1, 0xc42012b6e0, 0x82df60, 0xc42012b800)
	/usr/local/go/src/fmt/print.go:247 +0x5c fp=0xc42015dd70 sp=0xc42015dd08
fmt.Println(0xc42015de68, 0x1, 0x1, 0xc42014d720, 0xc42014f5c0, 0xc42012b6e0)
	/usr/local/go/src/fmt/print.go:257 +0x57 fp=0xc42015ddc0 sp=0xc42015dd70
main.main()
	/home/shatranj/GoLang/gorpc/src/app/testRetag.go:62 +0x723 fp=0xc42015df88 sp=0xc42015ddc0
runtime.main()
	/usr/local/go/src/runtime/proc.go:185 +0x20a fp=0xc42015dfe0 sp=0xc42015df88
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc42015dfe8 sp=0xc42015dfe0

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1
exit status 2

go version:

go version go1.8 linux/amd64

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