Enum dynamodb_expression::path::Element

pub enum Element {
    Name(Name),
    IndexedField(IndexedField),
}

Represents a single element of a DynamoDB document Path. For example, in foo[3][7].bar[2].baz, the Elements would be foo[3][7], bar[2], and baz.

See also: Path

Variants

Name(Name)

IndexedField(IndexedField)

Implementations

impl Element

pub fn new_name<T>(name: T) -> Self

where T: Into<Name>,

Creates an element that represents a single attribute name in a document path.

See also: Name, Element, Path

pub fn new_indexed_field<N, I>(name: N, indexes: I) -> Self

where N: Into<Name>, I: Indexes,

Creates an element that represents a single attribute name with indexed field(s) element of a document path. For example, foo[3] or foo[7][4]

The indexes parameter, here, can be an array, slice, Vec of, or single usize.

assert_eq!("foo[3]", Element::new_indexed_field("foo", 3).to_string());
assert_eq!("foo[3]", Element::new_indexed_field("foo", [3]).to_string());
assert_eq!("foo[3]", Element::new_indexed_field("foo", &[3]).to_string());
assert_eq!("foo[3]", Element::new_indexed_field("foo", vec![3]).to_string());

assert_eq!("foo[7][4]", Element::new_indexed_field("foo", [7, 4]).to_string());
assert_eq!("foo[7][4]", Element::new_indexed_field("foo", &[7, 4]).to_string());
assert_eq!("foo[7][4]", Element::new_indexed_field("foo", vec![7, 4]).to_string());

assert_eq!("foo", Element::new_indexed_field("foo", []).to_string());
assert_eq!("foo", Element::new_indexed_field("foo", &[]).to_string());
assert_eq!("foo", Element::new_indexed_field("foo", vec![]).to_string());

See also: IndexedField, Path, Path::new_indexed_field

Trait Implementations

impl Clone for Element

fn clone(&self) -> Element

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Element

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

Formats the value using the given formatter.

impl Display for Element

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

Formats the value using the given formatter.

impl<N, I> From<(N, I)> for Element

where N: Into<Name>, I: Indexes,

fn from((name, indexes): (N, I)) -> Self

Converts to this type from the input type.

impl From<Element> for String

fn from(element: Element) -> Self

Converts to this type from the input type.

impl From<IndexedField> for Element

fn from(value: IndexedField) -> Self

Converts to this type from the input type.

impl From<Name> for Element

fn from(name: Name) -> Self

Converts to this type from the input type.

impl FromStr for Element

type Err = PathParseError

The associated error which can be returned from parsing.

fn from_str(input: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Element

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Element

fn cmp(&self, other: &Element) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Element

fn eq(&self, other: &Element) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Element

fn partial_cmp(&self, other: &Element) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Element

impl StructuralEq for Element

impl StructuralPartialEq for Element