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QUESTION
I'd like to skip validation for empty arrays in a json file for a specific field. Below you can see Book structs definition, which could be validated if no authors are declared in json file. On the other hand it fails if an empty array is defined for authors. Is it possible to achieve this behavior with existing tags, or do I have to define custom validator?
...ANSWER
Answered 2022-Feb-26 at 20:02It's because your Authors validation string is "omitempty,min=1,dive,min=3"
. The length of an empty slice is 0, which is <1.
If you replace the validation string with "omitempty,min=0,dive,min=3"
instead, it'll pass.
QUESTION
I have created some Go functions that make HTTP GET calls to services that are out there on the internet and parse the results.
I am now working on writing test-cases for these functions.
In my test cases, I'm using the go package httptest
to simulate calls to these external services. Below is my code. Error checking is purposefully removed for brevity. Here is the go-playground.
ANSWER
Answered 2021-Aug-20 at 06:23you could use a hack like follows ( playground : here)
QUESTION
I'm using this library to validate my Go struct. https://pkg.go.dev/github.com/go-playground/validator/v10
How do I validate a field only if it's populated? For example, I have an optional phone number field in one of my structs. If the user has provided this value, I would like to validate it using E.164 format.
...ANSWER
Answered 2021-Aug-16 at 15:36Use the omitempty
tag.
QUESTION
I am trying to validate the request body according to this struct using validator. But in Postman it always throws an error when validating the struct. I just want all values to be required when making a request.
...ANSWER
Answered 2021-Jun-03 at 04:45Moving Comment to answer
I see a problem in your code the link you have shared is https://github.com/go-playground/validator
but in the code, import is gopkg.in/validator.v2
If you are using the go-playground validator
Use below code to validate
QUESTION
I am using go-playground/validator/v10
to validate some input and have some trouble with custom validation tags and functions. The problem is that the function is not called when one of the struct fields is a different struct. This is an example:
ANSWER
Answered 2021-Apr-26 at 23:38The function validator.RegisterValidation(...)
is registering a field level custom validator, as the type of the registered function suggests func(fl validator.FieldLevel) bool
.
Struct fields themselves are not validated this way and your custom validator is ignored.
To validate a struct field you should use validate.RegisterStructValidation(myValidate, ChildStruct{})
, where the function myValidate
is of type validator.StructLevelFunc
.
Inside this function you can then perform validation of the struct, either the field itself and/or its nested fields:
QUESTION
I am using the below code to sync goroutines. Recently while investigating a bug I found that the below code is not working always. Approx one out of five times it fails. The channel quit
gets the message before my out
channel. I am able to consistently reproduce this issue in my local (not in go-playground) and in k8s environments. As a workaround, I am now using sync.Map
to synchronize.
Is there a way to fix the below code?
...ANSWER
Answered 2021-Apr-11 at 05:33The out channel can contain values when quit is received. Fix by making out an unbuffered channel:
QUESTION
ANSWER
Answered 2020-Oct-28 at 06:47You need to source and persist changes to your PATH
env variable. If you using bash you can add next changes to .bashrc
or .bash_profile
(it's up to OS).
QUESTION
I am trying to use the Golang Validator (https://godoc.org/gopkg.in/go-playground/validator.v9) to validate a Request body. I have two entities, Rule and Item. The Item entity relies on the Rule entity.
...ANSWER
Answered 2020-Jun-22 at 20:50From the example here, you can do something like below:
QUESTION
I'm trying to catch binding errors with gin gonic and it's working fine for all validation errors from go-playground/validator/v10 but i'm having an issue catching errors when unmarshalling into the proper data type.
Unsuccessful validation of a struct field will return a gin.ErrorTypeBind
Type of error when using validator tags ( required, ...)
but if i have a struct
...ANSWER
Answered 2020-Oct-18 at 15:42errors.Is
looks for an exact match (in your case, an empty instance of json.UnmarshalTypeError
). Use errors.As
instead:
QUESTION
I have a struct that i'm trying to validate a struct using validator v10 for which field can be of type null.XX from null.v4 package.
...ANSWER
Answered 2020-Oct-14 at 11:13You dont need to unparse the field inside the validator and make a custom case just for the special type.
Instead just create a new type then you can just use the normal bindings.
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