Hi,
This is an example from http://github.com/stuartsierra/component
(defn get-user [database username]
(execute-query (:connection database)
"SELECT * FROM users WHERE username = ?"
username))
Here 'database' is a component which is passed to 'get-user' as an
argument. The component can be used just like any other hashmap, so
(:connection database) gets the database connection.
On Sunday, March 15, 2015 at 4:20:35 PM UTC+1, Torsten Uhlmann wrote:
>
> Hi,
>
> I'm tapping my toes in component land and I think I lack some conceptual
> understanding, probably done too much OO.
> Please forgive me if this is a stupid question (and I get a feel that it
> is)...
>
> Suppose I create a Lifecycle component with some state, say, a database
> component that creates a connection on calling "start".
> That connection is assoc'ed into the component map.
>
> Now, how do I access the database component map when I want to call
> functions that use the connection?
> These functions are defined outside the defrecord of the component, how do
> they get access to the map?
>
> I could access the system var (the one that holds the system for
> development purposes) or save it into an atom, but I don't really think
> that would be a good approach?
>
> Thanks,
> Torsten.
>
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