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package validation_test |
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import ( |
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"context" |
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"errors" |
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"fmt" |
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"log" |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/it" |
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) |
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type contextKey string |
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const exampleKey contextKey = "exampleKey" |
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type TagStorage struct { |
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// this might be stored in the database |
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tags []string |
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} |
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func (storage *TagStorage) FindByName(ctx context.Context, name string) ([]string, error) { |
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contextValue, ok := ctx.Value(exampleKey).(string) |
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if !ok { |
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return nil, errors.New("context value missing") |
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} |
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if contextValue != "value" { |
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return nil, errors.New("invalid context value") |
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} |
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found := make([]string, 0) |
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for _, tag := range storage.tags { |
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if tag == name { |
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found = append(found, tag) |
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} |
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} |
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return found, nil |
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} |
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type ExistingTagConstraint struct { |
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storage *TagStorage |
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} |
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func (c *ExistingTagConstraint) SetUp() error { |
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return nil |
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} |
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func (c *ExistingTagConstraint) Name() string { |
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return "ExistingTagConstraint" |
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} |
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func (c *ExistingTagConstraint) ValidateString(value *string, scope validation.Scope) error { |
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// usually, you should ignore empty values |
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// to check for an empty value you should use it.NotBlankConstraint |
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if value == nil || *value == "" { |
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return nil |
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} |
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// you can pass the context value from the scope |
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entities, err := c.storage.FindByName(scope.Context(), *value) |
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// here you can return a service error so that the validation process |
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// is stopped immediately |
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if err != nil { |
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return err |
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} |
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if len(entities) > 0 { |
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return nil |
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} |
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// use the scope to build violation with translations |
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return scope. |
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BuildViolation("unknownTag", `Tag "{{ value }}" does not exist.`). |
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// you can inject parameter value to the message here |
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AddParameter("{{ value }}", *value). |
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CreateViolation() |
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} |
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type StockItem struct { |
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Name string |
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Tags []string |
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} |
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func (s StockItem) Validate(validator *validation.Validator) error { |
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return validator.Validate( |
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validation.StringProperty("name", &s.Name, it.IsNotBlank(), it.HasMaxLength(20)), |
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validation.EachStringProperty("tags", s.Tags, validator.ValidateBy("isTagExists")), |
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) |
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} |
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func ExampleValidator_ValidateBy_customServiceConstraint() { |
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validator, err := validation.NewValidator() |
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if err != nil { |
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log.Fatal(err) |
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} |
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storage := &TagStorage{tags: []string{"movie", "book"}} |
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isTagExists := &ExistingTagConstraint{storage: storage} |
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// custom constraint can be stored in the validator's internal store |
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// and can be used later by calling the validator.ValidateBy method |
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err = validator.StoreConstraint("isTagExists", isTagExists) |
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if err != nil { |
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log.Fatal(err) |
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} |
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item := StockItem{ |
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Name: "War and peace", |
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Tags: []string{"book", "camera"}, |
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} |
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ctx := context.WithValue(context.Background(), exampleKey, "value") |
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err = validator.Validate( |
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// you can pass here the context value to the validation scope |
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validation.Context(ctx), |
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validation.Valid(item), |
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) |
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violations := err.(validation.ViolationList) |
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for _, violation := range violations { |
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fmt.Println(violation.Error()) |
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} |
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// Output: |
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// violation at 'tags[1]': Tag "camera" does not exist. |
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} |
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muonsoft /
validation
