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package validation_test |
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import ( |
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"context" |
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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 Brand struct { |
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Name string |
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} |
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type BrandRepository struct { |
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brands []Brand |
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} |
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func (repository *BrandRepository) FindByName(ctx context.Context, name string) ([]Brand, error) { |
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found := make([]Brand, 0) |
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for _, brand := range repository.brands { |
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if brand.Name == name { |
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found = append(found, brand) |
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} |
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} |
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return found, nil |
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} |
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// You can declare you own constraint interface to create custom constraints. |
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type BrandConstraint interface { |
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validation.Constraint |
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ValidateBrand(brand *Brand, scope validation.Scope) error |
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} |
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// To create your own functional argument for validation simply create a function with |
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// a typed value and use the validation.NewArgument constructor. |
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func BrandArgument(brand *Brand, options ...validation.Option) validation.Argument { |
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return validation.NewArgument(options, func(constraint validation.Constraint, scope validation.Scope) error { |
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if c, ok := constraint.(BrandConstraint); ok { |
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return c.ValidateBrand(brand, scope) |
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} |
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// If you want to use built-in constraints for checking for nil or empty values |
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// such as it.IsNil() or it.IsBlank(). |
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if c, ok := constraint.(validation.NilConstraint); ok { |
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if brand == nil { |
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return c.ValidateNil(scope) |
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} |
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return nil |
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} |
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return validation.NewInapplicableConstraintError(constraint, "Brand") |
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}) |
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} |
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// UniqueBrandConstraint implements BrandConstraint. |
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type UniqueBrandConstraint struct { |
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brands *BrandRepository |
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} |
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func (c *UniqueBrandConstraint) SetUp() error { |
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return nil |
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} |
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func (c *UniqueBrandConstraint) Name() string { |
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return "UniqueBrandConstraint" |
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} |
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func (c *UniqueBrandConstraint) ValidateBrand(brand *Brand, 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 brand == nil { |
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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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brands, err := c.brands.FindByName(scope.Context(), brand.Name) |
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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(brands) == 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("notUniqueBrand", `Brand with name "{{ name }}" already exists.`). |
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// you can inject parameter value to the message here |
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AddParameter("{{ name }}", brand.Name). |
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CreateViolation() |
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} |
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func ExampleNewArgument_customArgumentConstraintValidator() { |
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repository := &BrandRepository{brands: []Brand{{"Apple"}, {"Orange"}}} |
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isEntityUnique := &UniqueBrandConstraint{brands: repository} |
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brand := Brand{Name: "Apple"} |
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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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BrandArgument(&brand, 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: Brand with name "Apple" already exists. |
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} |
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muonsoft /
validation
