Hands-On Microservices with Rust

Add member

The add_member function requires a channel ID and a user ID to add a membership record to the memberships table:

pub fn add_member(&self, channel_id: Id, user_id: Id)    -> Result<Membership, Error>{    insert_into(memberships::table)        .values((                memberships::channel_id.eq(channel_id),                memberships::user_id.eq(user_id),                ))        .returning((                memberships::id,                memberships::channel_id,                memberships::user_id,                ))        .get_result(&self.conn)        .map_err(Error::from)}

The implementation is simple and it uses the insert_into function call to prepare the INSERT statement to insert a new Membership value in the table. We also need a function to add new messages to a channel.