module

Redis::Commands::Immediate

Immediate objects are ones that execute commands on the server and return their results immediately. This allows the caller to know that it can go to work on the results directly. The counterpart to this is the Deferred type.

client = Redis::Client.new
p! typeof(client.get("foo")) # => (String | Nil)
client.pipeline do |pipeline|
  p! typeof(pipeline.get("foo")) # => Redis::Future
end
client.multi do |txn|
  p! typeof(txn.get("foo")) # => Nil
end

Objects that include this mixin must return a Redis::Value from their run method. This mixin overrides various Redis command methods to downcast the return types to only the types that the Redis server is known to return.

Instance methods

cms

Source

get!(key : String) : String

Returns the value of the string stored in key, asserting that it exists.

require "redis"
require "msgpack" # Storing MessagePack data

struct Cart
  include MessagePack::Serializable

  getter user_id : Int64
  getter items : Array(Item)

  struct Item
    include MessagePack::Serializable

    getter id : Int64
    getter product_id : Int64
    getter quantity : Int32
    getter unit_price_cents : Int64
  end
end

p! Cart.from_msgpack(redis.get!("cart:123"))

Source

info

Source

topk

Returns a TopK::Immediate, which automatically downcasts results from TopK into the appropriate type for those methods.

Source