A storage of state per message.
Messages storage can be used to store state for each message
separately. For example, when a chatting bot broadcasts a message from
Alice to Bob, it can store the ID of the broadcasted message in state
for the original message's ID, and if Alice edits her message, the bot
can edit the corresponding message on Bob's side.
Messages has a similar API to the API of
Chats — all of the methods
from the latter are adapted for the former, except that the key is a special
MessageId, which contains a message's and its chat's IDs.
In addition, for each method working with all records,
additional methods with the
in_chat[_by_id] postfix that work only with
messages with the specified chat ID. For example,
len returns the amount
of all records, while
len_in_chat returns the amount of records with
the specified chat (which is inferred from the context in the case of this
len_in_chat_by_id, on the other hand, takes a chat ID directly).
An iterator over the entries of
A mutable iterator over the entries of
A struct containing a message's and its chat's IDs.
A storage of state per message. See the module's docs to learn how to use it.