Views filter rooms by occupacy

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I have a site with 2 content types: rooms and reservations. I want to list
all the rooms without a reservation for an interval, and also for services,
capacity, ....

I tried creating a view with a PHP filter to check free rooms, but then if
the page lists 10 rooms, sometimes there are 7, 2, or 0; because the filter
lists the 10 rooms and after remove the occupied ones.

I have tried to create a "subview" filter to select nodes "not in (view of
occupied rooms); but I haven't find a way to do so.

Any idea of how to accomplish this?

thanks
--=20
*Ser freak no =C3=A9s imprescindible per ser inform=C3=A0tic, per=C3=B2 aju=
da.

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<div dir=3D"ltr"><div>I have a site with 2 content types: rooms and reserva=
tions. I want to list all the rooms without a reservation for an interval, =
and also for services, capacity, ....<br></div><div><br></div><div>I tried =
creating a view with a PHP filter to check free rooms, but then if the page=
 lists 10 rooms, sometimes there are 7, 2, or 0; because the filter lists t=
he 10 rooms and after remove the occupied ones.<br clear=3D"all"><div><br><=
/div><div>I have tried to create a &quot;subview&quot; filter to select nod=
es &quot;not in (view of occupied rooms); but I haven&#39;t find a way to d=
o so.</div><div><br></div><div>Any idea of how to accomplish this?</div><di=
v><br></div><div>thanks</div>-- <br><div class=3D"gmail_signature">*Ser fre=
ak no =C3=A9s imprescindible per ser inform=C3=A0tic, per=C3=B2 ajuda.<br><=
/div>
</div></div>

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