http://stuartsierra.com/2013/03/29/perils-of-dynamic-scope is a good
read around this subject.
On 21 March 2015 at 21:47, coco <clasesparticulares...@gmail.com> wrote:
> Hi guys, I'm curious about how work some codes with binding and dynamics
> vars, for instance, in sqlkorma you define your db settings
>
> (defdb prod (postgres {:db "korma"
> :user "db"
> :password "dbpass"}))
>
>
> and then you can use other functions like this
>
> (select user
> (with address)
> (fields :firstName :lastName :address.state)
> (where {:email "ko...@sqlkorma.com"}))
>
>
> without pass your config db as parameter..
>
> some korma functions expects your db configuration as first parameter...but
> if you had defined your db before using defdb macro, then you can omit this
> parameter
>
>
> (defentity users
> ;; Basic configuration
> (pk :id) ;; by default "id". This line is unnecessary.
> ;; it's used for relationships joins.
> (table :users) ;; by default the name of the symbol.
> ;; The line above is also unecessary.
> (database db) ;; if none is specified the last defdb <-------
> ;; will be used. Also unnecessary.
>
> ....)
>
>
> I've found this pattern in many clojure codes, but I can't understand how it
> works..can someone provides me a simple and clear example about how write
> something like this?..thank so much!
>
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