It might be better to ask this on the https://elixirforum.com/ site.
Initially though, I'm curious what the quote'ing and such there is for, are
these functions being used in a macro? Ecto queries are very changeable
without macro's too.
On Thursday, September 8, 2016 at 6:24:53 AM UTC-6, Vlad Alyukov wrote:
>
> Hi there,
>
>
> When I try to make up a new hex (something like ransack in ruby land) I
> have the next problem:
>
>
> ===
>
> defp match(%Rule{op: :eq, field: field, assoc: nil}, value, query) do
>
> quote do: unquote(query) |> where([q], q.unquote(field) ==
> ^unquote(var!(value)))
>
> end
>
> defp match(%Rule{op: :eq, field: field, assoc: assoc}, value, query) do
>
> quote do
>
> unquote(query)
>
> |> join(:inner, [r], l in assoc(r, unquote(var!(assoc))))
>
> |> where([q], q.unquote(field) == ^unquote(var!(value)))
>
> end
>
> end
>
> ===
>
>
> first function works well, but when I try to pass "unquote(query)"
> (regular "Ecto.Query" struct) to macros "join", I got an exception like
> this:
>
>
> ===
>
> ** (CompileError) nofile: invalid quoted expression: #Ecto.Query<from
> o in Order>
>
> ===
>
>
> Did I do something wrong? Why "where" and "join" macros have different
> semantics? And, of course is there other way to build dynamic queries?
>
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