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ozzo/ozzo-validation operators

This page lists all operators available in the ozzo/ozzo-validation sub-package of ro.

Install

First, import the sub-package in your project:

go get -u github.com/samber/ro/plugins/ozzo/ozzo-validation

• Validate

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates values with rules.

  import (
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string
      Age  int
  }
  
  obs := ro.Pipe[User, roozzovalidation.Result[User]](
      ro.Just(User{Name: "Alice", Age: 30}),
      roozzo.Validate[User](
          validation.Rule{Name: "name", Required: true},
          validation.Rule{Name: "age", Required: true, Min: 18},
      ),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[roozzovalidation.Result[User]]())
  defer sub.Unsubscribe()
  
  // Next: {Value: {Name: "Alice", Age: 30}, Error: nil}
  // Completed

  Similar:

  validateorerrorvalidatestruct

  Prototype:

  func Validate[T any](rules ...ozzo.Rule)

• ValidateOrSkip

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates observable values and skips invalid ones.

  import (
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string
      Age  int
  }
  
  obs := ro.Pipe[User, User](
      ro.Just(
          User{Name: "Alice", Age: 30}, // valid
          User{Name: "", Age: 15},      // invalid (empty name, too young)
          User{Name: "Bob", Age: 25},   // valid
      ),
      roozzo.ValidateOrSkip[User](
          validation.Rule{Name: "name", Required: true},
          validation.Rule{Name: "age", Required: true, Min: 18},
      ),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[User]())
  defer sub.Unsubscribe()
  
  // Next: {Name: "Alice", Age: 30}
  // Next: {Name: "Bob", Age: 25}
  // Completed (invalid entry skipped)

  Similar:

  validatevalidatestructorskip

  Prototype:

  func ValidateOrSkip[T any](rules ...ozzo.Rule)

• ValidateStructOrSkip

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates struct observables and skips invalid ones.

  import (
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string `validate:"required"`
      Age  int    `validate:"required,min=18"`
  }
  
  func (u User) Validate() error {
      return validation.ValidateStruct(&u,
          validation.Field(&u.Name, validation.Required),
          validation.Field(&u.Age, validation.Required, validation.Min(18)),
      )
  }
  
  obs := ro.Pipe[User, User](
      ro.Just(
          User{Name: "Alice", Age: 30}, // valid
          User{Name: "", Age: 15},      // invalid
          User{Name: "Bob", Age: 25},   // valid
      ),
      roozzo.ValidateStructOrSkip[User](),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[User]())
  defer sub.Unsubscribe()
  
  // Next: {Name: "Alice", Age: 30}
  // Next: {Name: "Bob", Age: 25}
  // Completed (invalid entry skipped)

  Similar:

  validateorskipvalidatestruct

  Prototype:

  func ValidateStructOrSkip[T any]()

• ValidateOrSkipWithContext

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates observable values with context and skips invalid ones.

  import (
      "context"
  
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string
      Age  int
  }
  
  obs := ro.Pipe[User, User](
      ro.Just(
          User{Name: "Alice", Age: 30}, // valid
          User{Name: "", Age: 15},      // invalid
          User{Name: "Bob", Age: 25},   // valid
      ),
      roozzo.ValidateOrSkipWithContext[User](
          validation.Rule{Name: "name", Required: true},
          validation.Rule{Name: "age", Required: true, Min: 18},
      ),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[User]())
  defer sub.Unsubscribe()
  
  // Next: {Name: "Alice", Age: 30}
  // Next: {Name: "Bob", Age: 25}
  // Completed (invalid entry skipped with context support)

  Similar:

  validateorskipvalidatestructorskipwithcontext

  Prototype:

  func ValidateOrSkipWithContext[T any](rules ...ozzo.Rule)

• ValidateWithContext

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates values with rules using context.

  import (
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string
      Age  int
  }
  
  obs := ro.Pipe[User, Result[User]](
      ro.Just(User{Name: "Alice", Age: 30}),
      roozzo.ValidateWithContext[User](
          ozzo.Rule{Name: "name", Required: true},
          ozzo.Rule{Name: "age", Required: true, Min: 18},
      ),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[Result[User]]())
  defer sub.Unsubscribe()
  
  // Next: {Value: {Name: "Alice", Age: 30}, Error: nil}
  // Completed

  Similar:

  validatevalidateorerrorwithcontextvalidatestructwithcontext

  Prototype:

  func ValidateWithContext[T any](rules ...ozzo.Rule)

• ValidateStructOrSkipWithContext

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates struct observables with context and skips invalid ones.

  import (
      "context"
  
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string `validate:"required"`
      Age  int    `validate:"required,min=18"`
  }
  
  func (u User) ValidateWithContext(ctx context.Context) error {
      return validation.ValidateStructWithContext(ctx, &u,
          validation.Field(&u.Name, validation.Required),
          validation.Field(&u.Age, validation.Required, validation.Min(18)),
      )
  }
  
  obs := ro.Pipe[User, User](
      ro.Just(
          User{Name: "Alice", Age: 30}, // valid
          User{Name: "", Age: 15},      // invalid
          User{Name: "Bob", Age: 25},   // valid
      ),
      roozzo.ValidateStructOrSkipWithContext[User](),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[User]())
  defer sub.Unsubscribe()
  
  // Next: {Name: "Alice", Age: 30}
  // Next: {Name: "Bob", Age: 25}
  // Completed (invalid entry skipped with context support)

  Similar:

  validateorskipwithcontextvalidatestructorskip

  Prototype:

  func ValidateStructOrSkipWithContext[T any]()

• ValidateStruct

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates struct values that implement ozzo.Validatable interface.

  import (
      "github.com/go-ozzo/ozzo-validation/v4"
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
  )
  
  type User struct {
      Name string `validate:"required"`
      Age  int    `validate:"required,min=18"`
  }
  
  func (u User) Validate() error {
      return ozzo.ValidateStruct(&u,
          ozzo.Field(&u.Name, ozzo.Required),
          ozzo.Field(&u.Age, ozzo.Required, ozzo.Min(18)),
      )
  }
  
  obs := ro.Pipe[User, Result[User]](
      ro.Just(User{Name: "Alice", Age: 30}),
      roozzo.ValidateStruct[User](),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[Result[User]]())
  defer sub.Unsubscribe()
  
  // Next: {Value: {Name: "Alice", Age: 30}, Error: nil}
  // Completed

  Similar:

  validatevalidatestructorerrorvalidatestructwithcontext

  Prototype:

  func ValidateStruct[T any]()

• ValidateStructWithContext

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates struct values that implement ozzo.ValidatableWithContext interface using context.

  import (
      "context"
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string `validate:"required"`
      Age  int    `validate:"required,min=18"`
  }
  
  func (u User) ValidateWithContext(ctx context.Context) error {
      return ozzo.ValidateStructWithContext(ctx, &u,
          ozzo.Field(&u.Name, ozzo.Required),
          ozzo.Field(&u.Age, ozzo.Required, ozzo.Min(18)),
      )
  }
  
  obs := ro.Pipe[User, Result[User]](
      ro.Just(User{Name: "Alice", Age: 30}),
      roozzo.ValidateStructWithContext[User](),
  )
  
  sub := obs.Subscribe(ro.PrintObserver[Result[User]]())
  defer sub.Unsubscribe()
  
  // Next: {Value: {Name: "Alice", Age: 30}, Error: nil}
  // Completed

  Similar:

  validatestructvalidatestructorerrorwithcontextvalidatewithcontext

  Prototype:

  func ValidateStructWithContext[T any]()

• ValidateOrError

  ozzo-validationplugin

  🧩 Source📚 GoDoc

  Validates or emits error.

  import (
      "fmt"
      "github.com/samber/ro"
      roozzo "github.com/samber/ro/plugins/ozzo-validation"
      "github.com/go-ozzo/ozzo-validation/v4"
  )
  
  type User struct {
      Name string
      Age  int
  }
  
  obs := ro.Pipe[User, User](
      ro.Just(
          User{Name: "Alice", Age: 30},  // valid
          User{Name: "", Age: 15},        // invalid
      ),
      roozzo.ValidateOrError[User](
          ozzo.Rule{Name: "name", Required: true},
          ozzo.Rule{Name: "age", Required: true, Min: 18},
      ),
  )
  
  sub := obs.Subscribe(
      ro.NewObserver(
          func(user User) { fmt.Printf("Valid: %+v\n", user) },
          func(err error) { fmt.Printf("Error: %v\n", err) },
          func() { fmt.Println("Completed") },
      ),
  )
  defer sub.Unsubscribe()
  
  // Valid: {Name:Alice Age:30}
  // Error: validation failed
  // Completed

  Similar:

  validate

  Prototype:

  func ValidateOrError[T any](rules ...ozzo.Rule)