Try expanding out the expression. The macro starts with:
`(-> (~query-fn-var ~@args) ~@body)
Now plug in the values:
`(-> (#'insert* users) (values {:first "john" :last "doe"}))
Then expand the threading macro:
`(values (#'insert* users) {:first "john" :last "doe"})
So we end up with `values` taking two arguments, which is correct.
- James
On 21 April 2014 15:07, Hussein B. <hubaghd...@gmail.com> wrote:
> Hi,
>
> I'm trying to study the source code of Korma project.
>
> (insert users
> (values {:first "john" :last "doe"}))
>
>
> This will resolve to (defmacro insert)
> https://github.com/korma/Korma/blob/master/src/korma/core.clj#L143
>
>
> Will call (defn- make-query-then-execute)
> https://github.com/korma/Korma/blob/master/src/korma/core.clj#L109
>
>
> What I don't get is the following:
>
>
> `(let [query# (-> (~query-fn-var ~@args)
> ~@body)]
>
>
> (~query-fn-var ~@args) will generate a map that will be feed to (defn values)
> which accepts two arguments.
>
> https://github.com/korma/Korma/blob/master/src/korma/core.clj#L280
>
>
> I expected that part to throw:
>
>
> CompilerException clojure.lang.ArityException: Wrong number of args (1)
> passed to: core/values
>
> But it is not.
>
> Any ideas why it is working?
>
> Thanks for help and time.
>
>
>
>
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