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Proper error handling when no entity is found

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0

I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.

I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?

I know google's datastore returns error when no entity is found.

Right now I'm using gorm and it also returns error when no entity is found.

I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?

database go error-handling

share|improve this question

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There is no "best practice" here. Only opinion. Do what makes sense for your application.
  
  – Flimzy
  Mar 27 at 11:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type, nil is a valid value for that type. As to whether you should, that's purely opinion-based.
  
  – Adrian
  Mar 27 at 13:19
  

  
  
  
  

add a comment | 

0

I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.

I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?

I know google's datastore returns error when no entity is found.

Right now I'm using gorm and it also returns error when no entity is found.

I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?

database go error-handling

share|improve this question

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There is no "best practice" here. Only opinion. Do what makes sense for your application.
  
  – Flimzy
  Mar 27 at 11:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type, nil is a valid value for that type. As to whether you should, that's purely opinion-based.
  
  – Adrian
  Mar 27 at 13:19
  

  
  
  
  

add a comment | 

I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.

I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?

I know google's datastore returns error when no entity is found.

Right now I'm using gorm and it also returns error when no entity is found.

I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?

database go error-handling

share|improve this question

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

share|improve this question

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

share|improve this question

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

edited Mar 27 at 8:58

Abdullah

1,07111 gold badge77 silver badges1818 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

asked Mar 27 at 8:32

Mohi_kMohi_k

266 bronze badges

2 Answers
2

active

oldest

votes

0

If you are using gorm, there is a function specifically for that; namely,

// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool 

You can use it as following:

err = db.Find(object).Error
if err != nil 
 if gorm.IsRecordNotFoundError(err) 
 // handle object not found
 else 
 return err
 

and for your question:

I'm wondering you can simply return nil as the value instead of returning an error

It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.

share|improve this answer

edited Mar 27 at 8:48

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

add a comment | 

0

you can use this code:

 user:=&User
 if db.First(&user, "username=?", mobile).RecordNotFound() 
 return nil
 
 return user

share|improve this answer

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

add a comment | 

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0

If you are using gorm, there is a function specifically for that; namely,

// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool 

You can use it as following:

err = db.Find(object).Error
if err != nil 
 if gorm.IsRecordNotFoundError(err) 
 // handle object not found
 else 
 return err
 

and for your question:

I'm wondering you can simply return nil as the value instead of returning an error

It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.

share|improve this answer

edited Mar 27 at 8:48

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

add a comment | 

0

If you are using gorm, there is a function specifically for that; namely,

// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool 

You can use it as following:

err = db.Find(object).Error
if err != nil 
 if gorm.IsRecordNotFoundError(err) 
 // handle object not found
 else 
 return err
 

and for your question:

I'm wondering you can simply return nil as the value instead of returning an error

It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.

share|improve this answer

edited Mar 27 at 8:48

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

add a comment | 

If you are using gorm, there is a function specifically for that; namely,

// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool 

You can use it as following:

err = db.Find(object).Error
if err != nil 
 if gorm.IsRecordNotFoundError(err) 
 // handle object not found
 else 
 return err
 

and for your question:

I'm wondering you can simply return nil as the value instead of returning an error

It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.

share|improve this answer

edited Mar 27 at 8:48

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool 

err = db.Find(object).Error
if err != nil 
 if gorm.IsRecordNotFoundError(err) 
 // handle object not found
 else 
 return err
 

share|improve this answer

edited Mar 27 at 8:48

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

answered Mar 27 at 8:42

AbdullahAbdullah

1,07111 gold badge77 silver badges1818 bronze badges

0

you can use this code:

 user:=&User
 if db.First(&user, "username=?", mobile).RecordNotFound() 
 return nil
 
 return user

share|improve this answer

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

add a comment | 

0

you can use this code:

 user:=&User
 if db.First(&user, "username=?", mobile).RecordNotFound() 
 return nil
 
 return user

share|improve this answer

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

add a comment | 

you can use this code:

 user:=&User
 if db.First(&user, "username=?", mobile).RecordNotFound() 
 return nil
 
 return user

share|improve this answer

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

 user:=&User
 if db.First(&user, "username=?", mobile).RecordNotFound() 
 return nil
 
 return user

share|improve this answer

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges

answered Mar 27 at 14:15

morteza khademmorteza khadem

8155 bronze badges