Passing pointer as interface type
1
Help me. I'm stuck at this, I make a checkRecordExistence to check for the existence of a record.This function take a model as an interface type, i pass the model down to the First function which also take model as an interface type but it doesnt work
func checkRecordExistence(model interface, query string, field ...interface) bool
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err)
return false
return true
// GetPlaylists of a specific user
func GetPlaylists(username string) (playlists Playlist)
playlists = Playlist
user := User
if exist := checkRecordExistence(user, "username = ?", username); !exist
return
db.GetDB().Preload("Songs.Artists").Preload("Songs").Model(&user).Related(&playlists, "UserRefer")
return
When i call the GetPlaylists function it crashed
eflect.Value.Addr of unaddressable value
/usr/lib/go/src/runtime/panic.go:513 (0x42c4d8)
gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
/usr/lib/go/src/reflect/value.go:245 (0x4ae0c5)
Value.Addr: panic("reflect.Value.Addr of unaddressable value")
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/callback_query.go:74 (0x54f1b4)
queryCallback: scope.scan(rows, columns, scope.New(elem.Addr().Interface()).Fields())
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/scope.go:857 (0x5767a4)
(*Scope).callCallbacks: (*f)(scope)
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/main.go:289 (0x56528e)
(*DB).First: inlineCondition(where...).callCallbacks(s.parent.callbacks.queries).db
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35 (0x676c06)
checkRecordExistence: if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) {
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:45 (0x676dfc)
GetPlaylists: if exist := checkRecordExistence(user, "username = ?", username); !exist {
I think the problem is here: .Where(query, field...).First(model) but i can't find any solution, thanks if anyone can help me.
go
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
add a comment |
1
Help me. I'm stuck at this, I make a checkRecordExistence to check for the existence of a record.This function take a model as an interface type, i pass the model down to the First function which also take model as an interface type but it doesnt work
func checkRecordExistence(model interface, query string, field ...interface) bool
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err)
return false
return true
// GetPlaylists of a specific user
func GetPlaylists(username string) (playlists Playlist)
playlists = Playlist
user := User
if exist := checkRecordExistence(user, "username = ?", username); !exist
return
db.GetDB().Preload("Songs.Artists").Preload("Songs").Model(&user).Related(&playlists, "UserRefer")
return
When i call the GetPlaylists function it crashed
eflect.Value.Addr of unaddressable value
/usr/lib/go/src/runtime/panic.go:513 (0x42c4d8)
gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
/usr/lib/go/src/reflect/value.go:245 (0x4ae0c5)
Value.Addr: panic("reflect.Value.Addr of unaddressable value")
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/callback_query.go:74 (0x54f1b4)
queryCallback: scope.scan(rows, columns, scope.New(elem.Addr().Interface()).Fields())
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/scope.go:857 (0x5767a4)
(*Scope).callCallbacks: (*f)(scope)
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/main.go:289 (0x56528e)
(*DB).First: inlineCondition(where...).callCallbacks(s.parent.callbacks.queries).db
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35 (0x676c06)
checkRecordExistence: if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) {
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:45 (0x676dfc)
GetPlaylists: if exist := checkRecordExistence(user, "username = ?", username); !exist {
I think the problem is here: .Where(query, field...).First(model) but i can't find any solution, thanks if anyone can help me.
go
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
can you post code around this line/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?
– Dmitry Harnitski
Nov 14 '18 at 0:31
this line:if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false
– Anh Thi
Nov 14 '18 at 0:33
did you tryuser := &User?
– Dmitry Harnitski
Nov 14 '18 at 0:38
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45
add a comment |
1
1
1
Help me. I'm stuck at this, I make a checkRecordExistence to check for the existence of a record.This function take a model as an interface type, i pass the model down to the First function which also take model as an interface type but it doesnt work
func checkRecordExistence(model interface, query string, field ...interface) bool
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err)
return false
return true
// GetPlaylists of a specific user
func GetPlaylists(username string) (playlists Playlist)
playlists = Playlist
user := User
if exist := checkRecordExistence(user, "username = ?", username); !exist
return
db.GetDB().Preload("Songs.Artists").Preload("Songs").Model(&user).Related(&playlists, "UserRefer")
return
When i call the GetPlaylists function it crashed
eflect.Value.Addr of unaddressable value
/usr/lib/go/src/runtime/panic.go:513 (0x42c4d8)
gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
/usr/lib/go/src/reflect/value.go:245 (0x4ae0c5)
Value.Addr: panic("reflect.Value.Addr of unaddressable value")
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/callback_query.go:74 (0x54f1b4)
queryCallback: scope.scan(rows, columns, scope.New(elem.Addr().Interface()).Fields())
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/scope.go:857 (0x5767a4)
(*Scope).callCallbacks: (*f)(scope)
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/main.go:289 (0x56528e)
(*DB).First: inlineCondition(where...).callCallbacks(s.parent.callbacks.queries).db
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35 (0x676c06)
checkRecordExistence: if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) {
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:45 (0x676dfc)
GetPlaylists: if exist := checkRecordExistence(user, "username = ?", username); !exist {
I think the problem is here: .Where(query, field...).First(model) but i can't find any solution, thanks if anyone can help me.
go
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
Help me. I'm stuck at this, I make a checkRecordExistence to check for the existence of a record.This function take a model as an interface type, i pass the model down to the First function which also take model as an interface type but it doesnt work
func checkRecordExistence(model interface, query string, field ...interface) bool
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err)
return false
return true
// GetPlaylists of a specific user
func GetPlaylists(username string) (playlists Playlist)
playlists = Playlist
user := User
if exist := checkRecordExistence(user, "username = ?", username); !exist
return
db.GetDB().Preload("Songs.Artists").Preload("Songs").Model(&user).Related(&playlists, "UserRefer")
return
When i call the GetPlaylists function it crashed
eflect.Value.Addr of unaddressable value
/usr/lib/go/src/runtime/panic.go:513 (0x42c4d8)
gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
/usr/lib/go/src/reflect/value.go:245 (0x4ae0c5)
Value.Addr: panic("reflect.Value.Addr of unaddressable value")
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/callback_query.go:74 (0x54f1b4)
queryCallback: scope.scan(rows, columns, scope.New(elem.Addr().Interface()).Fields())
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/scope.go:857 (0x5767a4)
(*Scope).callCallbacks: (*f)(scope)
/home/anhthi/go/src/github.com/anhthii/go-echo/vendor/github.com/jinzhu/gorm/main.go:289 (0x56528e)
(*DB).First: inlineCondition(where...).callCallbacks(s.parent.callbacks.queries).db
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35 (0x676c06)
checkRecordExistence: if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) {
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:45 (0x676dfc)
GetPlaylists: if exist := checkRecordExistence(user, "username = ?", username); !exist {
I think the problem is here: .Where(query, field...).First(model) but i can't find any solution, thanks if anyone can help me.
go
go
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
asked Nov 14 '18 at 0:18
Anh ThiAnh Thi
93
93
can you post code around this line/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?
– Dmitry Harnitski
Nov 14 '18 at 0:31
this line:if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false
– Anh Thi
Nov 14 '18 at 0:33
did you tryuser := &User?
– Dmitry Harnitski
Nov 14 '18 at 0:38
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45
add a comment |
can you post code around this line/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?
– Dmitry Harnitski
Nov 14 '18 at 0:31
this line:if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false
– Anh Thi
Nov 14 '18 at 0:33
did you tryuser := &User?
– Dmitry Harnitski
Nov 14 '18 at 0:38
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45
can you post code around this line
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?– Dmitry Harnitski
Nov 14 '18 at 0:31
can you post code around this line
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?– Dmitry Harnitski
Nov 14 '18 at 0:31
this line:
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false – Anh Thi
Nov 14 '18 at 0:33
this line:
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false – Anh Thi
Nov 14 '18 at 0:33
did you try
user := &User?– Dmitry Harnitski
Nov 14 '18 at 0:38
did you try
user := &User?– Dmitry Harnitski
Nov 14 '18 at 0:38
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45
add a comment |
1 Answer
1
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oldest
votes
3
According to https://github.com/jinzhu/gorm/issues/394, parameter model should be a pointer. I think the code below would work.
if exist := checkRecordExistence(&user, "username = ?", username); !exist
return
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
add a comment |
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3
According to https://github.com/jinzhu/gorm/issues/394, parameter model should be a pointer. I think the code below would work.
if exist := checkRecordExistence(&user, "username = ?", username); !exist
return
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
add a comment |
3
According to https://github.com/jinzhu/gorm/issues/394, parameter model should be a pointer. I think the code below would work.
if exist := checkRecordExistence(&user, "username = ?", username); !exist
return
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
add a comment |
3
3
3
According to https://github.com/jinzhu/gorm/issues/394, parameter model should be a pointer. I think the code below would work.
if exist := checkRecordExistence(&user, "username = ?", username); !exist
return
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
According to https://github.com/jinzhu/gorm/issues/394, parameter model should be a pointer. I think the code below would work.
if exist := checkRecordExistence(&user, "username = ?", username); !exist
return
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
answered Nov 14 '18 at 0:40
Kitt HsuKitt Hsu
11714
11714
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can you post code around this line
/home/anhthi/go/src/github.com/anhthii/go-echo/db/models/playlist.go:35?– Dmitry Harnitski
Nov 14 '18 at 0:31
this line:
if err := db.GetDB().Where(query, field...).First(model).Error; gorm.IsRecordNotFoundError(err) return false– Anh Thi
Nov 14 '18 at 0:33
did you try
user := &User?– Dmitry Harnitski
Nov 14 '18 at 0:38
I'm so dumb for not realizing this thank you @DmitryHarnitski
– Anh Thi
Nov 14 '18 at 0:43
Funny, your question topic contains an answer :)
– Dmitry Harnitski
Nov 14 '18 at 0:45