Struct redis::LposOptions

pub struct LposOptions { /* private fields */ }

Options for the [LPOS] command

https://redis.io/commands/lpos

Example

use redis::{Commands, RedisResult, LposOptions};
fn fetch_list_position(
    con: &mut redis::Connection,
    key: &str,
    value: &str,
    count: usize,
    rank: isize,
    maxlen: usize,
) -> RedisResult<Vec<usize>> {
    let opts = LposOptions::default()
        .count(count)
        .rank(rank)
        .maxlen(maxlen);
    con.lpos(key, value, opts)
}

Implementations

impl LposOptions

pub fn count(self, n: usize) -> Self

Limit the results to the first N matching items.

pub fn rank(self, n: isize) -> Self

Return the value of N from the matching items.

pub fn maxlen(self, n: usize) -> Self

Limit the search to N items in the list.

Trait Implementations

impl Default for LposOptions

fn default() -> LposOptions

Returns the “default value” for a type.

impl ToRedisArgs for LposOptions

fn write_redis_args<W>(&self, out: &mut W) where
    W: ?Sized + RedisWrite, 

This writes the value into a vector of bytes. Each item is a single argument. Most items generate a single item.

fn is_single_arg(&self) -> bool

Returns an indiciation if the value contained is exactly one argument. It returns false if it’s zero or more than one. This is used in some high level functions to intelligently switch between GET and MGET variants.

fn to_redis_args(&self) -> Vec<Vec<u8>>

This converts the value into a vector of bytes. Each item is a single argument. Most items generate a vector of a single item.

fn describe_numeric_behavior(&self) -> NumericBehavior

Returns an information about the contained value with regards to it’s numeric behavior in a redis context. This is used in some high level concepts to switch between different implementations of redis functions (for instance INCR vs INCRBYFLOAT).