On Thu, Mar 20, 2014 at 5:57 AM, Adrian Miron <adrian.miron...@gmail.com>wrote:
>
> I'm starting to use om in some projects and one of the first components I
> had to build was a simple notification component. It shows a message at the
> top of the page. Other components in the page will use it to display
> messages when errors happen.
>
> My idea was to send the message string to it via a channel and store it in
> local state. From there it will be rendered by the component.
>
> The component doesn't use any application state so I build it with what I
> believed to be a nil cursor (om/build notification *nil* {...}). The
> problem is that when the component gets rendered I get a "No protocol
> method ICursor.-path defined for type null" error.
>
If you don't pass app state data to this component then you don't need to
bother with build at all. If you need a component that doesn't need app
state but does need component local state you need to use om.core/graft.
Refer to the documentation on om.core/graft and look at the examples in the
repo.
Channels could work. However :shared was also designed with this scenario
in mind, you could use an atom with the message in it and placed it in
:shared if the message is not an important piece of state for the rest of
your application. There are also examples of :shared in the repo as well.
HTH,
David
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