Struct UniquenessValidator 

pub struct UniquenessValidator {
    pub scope: Vec<String>,
    pub case_sensitive: bool,
    pub message: Option<String>,
    pub check: Option<Box<dyn Fn(&str, &Value) -> bool + Send + Sync>>,
    /* private fields */
}

Validates that a value is unique via an injected lookup function.

Fields

scope: Vec<String>

Additional attributes that define uniqueness scope.

case_sensitive: bool

Whether string comparisons should preserve case.

message: Option<String>

Custom message used when the value is taken.

check: Option<Box<dyn Fn(&str, &Value) -> bool + Send + Sync>>

Lookup function supplied by higher layers with storage access.

Implementations

impl UniquenessValidator

pub fn new() -> Self

Creates a new uniqueness validator.

pub fn allow_nil(self) -> Self

Skips validation when the attribute value is missing or null.

pub fn allow_blank(self) -> Self

Skips validation when the attribute value is blank.

pub fn on(self, contexts: Vec<ValidationContext>) -> Self

Restricts the validator to the provided contexts.

pub fn strict(self) -> Self

Raises immediately instead of collecting produced errors.

pub fn if_cond<F>(self, cond: F) -> Self

where F: Fn(&Value) -> bool + Send + Sync + 'static,

Runs the validator only when the predicate returns true.

pub fn unless_cond<F>(self, cond: F) -> Self

where F: Fn(&Value) -> bool + Send + Sync + 'static,

Skips the validator when the predicate returns true.

pub fn with_check<F>(self, check: F) -> Self

where F: Fn(&str, &Value) -> bool + Send + Sync + 'static,

Registers a uniqueness check where true means the value is unique.

pub fn message(self, message: impl Into<String>) -> Self

Overrides the default taken message.

Trait Implementations

impl Debug for UniquenessValidator

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for UniquenessValidator

fn default() -> UniquenessValidator

Returns the “default value” for a type.

impl Validator for UniquenessValidator

fn validate(&self, attribute: &str, value: Option<&Value>, errors: &mut Errors)

Validates a single attribute value, adding any produced errors.

fn name(&self) -> &str

Returns the validator’s display name.

fn options(&self) -> &ValidatorOptions

Returns the common runtime options for this validator.

fn validate_with_attrs( &self, attribute: &str, value: Option<&Value>, _attrs: &dyn Fn(&str) -> Option<Value>, errors: &mut Errors, )

Validates a single attribute with access to sibling attributes when needed.