I am trying to figure out a decent approach toward dealing with multiple uses for a struct. Let me explain the scenario.
I have a struct that represents the Model in gorm. In the current implementation, I have validation bound to this struct so when a request hits the endpoint I would validate against the model's struct. This works fine for most cases. But then there are some instances where I want to have more control over the request and the response.
This is possible by introducing a few additional internal structs that will parse the request and response. And I can decouple the validation from the model into the request specific struct. I am trying to figure out what the best practice is around these patterns. Pretty sure a lot of peeps would have faced a similar situation.
// Transaction holds the transaction details.
type Transaction struct {
Program Program
ProgramID uuid.UUID
Type string
Value float64
Reference string
}
// TransactionRequest for the endpoint.
type TransactionRequest struct {
ProgramKey string `json:"program_key" validator:"required"`
Type string `json:"type" validator:"required,oneof=credit debit"`
Value float64 `json:"value" validator:"required,numeric"`
Reference string `json:"reference" validator:"required"`
}
Update:
I managed to find a balance by introducing additional tags for update requests, I wrote about how I achieved it here
I faced similar problem and for solving that, defined a method for validating and didn't use tags. I had to, because I follow DDD and we should validate in service layer not API layer.
here is a sample of my apporach:
type Station struct {
types.GormCol
CompanyID types.RowID `gorm:"not null;unique" json:"company_id,omitempty"`
CompanyName string `gorm:"not null;unique" json:"company_name,omitempty"`
NodeCode uint64 `json:"node_code,omitempty"`
NodeName string `json:"node_name,omitempty"`
Key string `gorm:"type:text" json:"key,omitempty"`
MachineID string `json:"machine_id,omitempty"`
Detail string `json:"detail,omitempty"`
Error error `sql:"-" json:"user_error,omitempty"`
Extra map[string]interface{} `sql:"-" json:"extra_station,omitempty"`
}
// Validate check the type of
func (p *Station) Validate(act action.Action) error {
fieldError := core.NewFieldError(term.Error_in_companys_form)
switch act {
case action.Save:
if p.CompanyName == "" {
fieldError.Add(term.V_is_required, "Company Name", "company_name")
}
if p.CompanyID == 0 {
fieldError.Add(term.V_is_required, "Company ID", "company_id")
}
}
if fieldError.HasError() {
return fieldError
}
return nil
}
file's address: https://github.com/syronz/sigma-mono/blob/master/model/station.model.go
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