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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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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/it" |
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"github.com/muonsoft/validation/validator" |
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) |
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type contextKey string |
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const exampleKey contextKey = "exampleKey" |
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type Entity struct { |
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Name string |
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} |
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type EntityRepository struct { |
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entities []Entity |
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} |
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func (repository *EntityRepository) FindByName(ctx context.Context, name string) ([]Entity, 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([]Entity, 0) |
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for _, entity := range repository.entities { |
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if entity.Name == name { |
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found = append(found, entity) |
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} |
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} |
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return found, nil |
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} |
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type UniqueEntityConstraint struct { |
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repository *EntityRepository |
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} |
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func (c *UniqueEntityConstraint) SetUp(scope *validation.Scope) error { |
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return nil |
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} |
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func (c *UniqueEntityConstraint) GetName() string { |
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return "UniqueEntityConstraint" |
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} |
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func (c *UniqueEntityConstraint) 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.repository.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("notUnique", `Entity with name "{{ name }}" already exists.`). |
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// you can inject parameter value to the message here |
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SetParameter("{{ name }}", *value). |
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GetViolation() |
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} |
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func ExampleValidator_Validate_customServiceConstraint() { |
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repository := &EntityRepository{entities: []Entity{{"camera"}, {"book"}}} |
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isEntityUnique := &UniqueEntityConstraint{repository: repository} |
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entity := Entity{Name: "book"} |
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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.String(&entity.Name, it.IsNotBlank(), isEntityUnique), |
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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: Entity with name "book" already exists. |
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} |
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muonsoft /
validation
