Yes, my mistake... struct(D4.Activity) resolved it... thanks !
On Monday, August 1, 2016 at 4:01:59 PM UTC-3, Ben Wilson wrote:
>
> As shown in the documentation on defprotocol, you need to define a struct
> in the D4.Activity module, and then pass a %D4.Activity{} struct to the
> protocol function. As it is you're just passing in a module name which is
> an Atom, and there is no protocol implementation for atoms.
>
> On Monday, August 1, 2016 at 2:54:29 PM UTC-4, Maximiliano Guzenski wrote:
>>
>> Hi,
>> I'm trying a simple to implement defprotocol/defimpl but I recevei always
>> a error:
>> ps.: Activity is a Ector module, I using phoenix
>>
>> defprotocol D4.Policy do
>> def scoped(a, query, conn)
>> end
>>
>> defimpl D4.Policy, for: D4.Activity do
>> def scoped(a, query, conn) do
>> IO.puts "hi"
>> end
>> end
>>
>> D4.Policy.scoped(D4.Activity, 1, 2)
>>
>> error -->
>>
>> ** (Protocol.UndefinedError) protocol D4.Policy not implemented for
>> D4.Activity
>>
>> (d4) web/lib/policy.ex:1: D4.Policy.impl_for!/1
>>
>> (d4) web/lib/policy.ex:3: D4.Policy.scoped/3
>>
>>
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