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< h1 > < i class = "glyphicon glyphicon-cog" > < / i > < code class = "obj" > virtualpathresolver< / code >
< span class = "sig" > (< code > prefix< / code > )< / span > < / h1 >
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< li > Method of < a href = "../" > Environment< / a > < / li >
< li > New in Lektor Version < em > 2.0< / em > < / li >
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< p > When implementing < a href = "../../db/obj/" class = "ref" > Virtual Source Objects< / a > it's important
that you can locate them. While virtual sources do not appear as children of
pages they can be navigated to through the database pad. This is achieved
through custom virtual path resolvers.< / p >
< p > Each source object needs to be a unique prefix which identifies all instances
of it. For instance if you want to implement a special page (like a feed)
that would exist for specific pages, then you can register the virtual path
prefix < code > feed< / code > with your plugin. Though you should use more descriptive names
for your plugins as these paths are shared.< / p >
< p > If a user then resolves the page < code > /my-page@feed< / code > it would invoke your URL
resolver with the record < code > my-page< / code > and an empty list (rest of the path
segments). If they would request < code > /my-page@feed/recent< / code > then it would
pass < code > ['recent']< / code > as path segments.< / p >
< h2 id = "example" > Example< / h2 > < p > Here an example that would implement a virtual source for feeds and an
associated virtual path resolver:< / p >
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< div class = "hll" > < pre > < span > < / span > < span class = "kn" > from< / span > < span class = "nn" > lektor.sourceobj< / span > < span class = "kn" > import< / span > < span class = "n" > VirtualSourceObject< / span >
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< span class = "kn" > from< / span > < span class = "nn" > lektor.utils< / span > < span class = "kn" > import< / span > < span class = "n" > build_url< / span >
< span class = "k" > class< / span > < span class = "nc" > Feed< / span > < span class = "p" > (< / span > < span class = "n" > VirtualSourceObject< / span > < span class = "p" > ):< / span >
< span class = "k" > def< / span > < span class = "fm" > __init__< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > record< / span > < span class = "p" > ,< / span > < span class = "n" > version< / span > < span class = "o" > =< / span > < span class = "s1" > ' default' < / span > < span class = "p" > ):< / span >
< span class = "n" > VirtualSourceObject< / span > < span class = "o" > .< / span > < span class = "fm" > __init__< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > record< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > version< / span > < span class = "o" > =< / span > < span class = "n" > version< / span >
< span class = "nd" > @property< / span >
< span class = "k" > def< / span > < span class = "nf" > path< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "k" > return< / span > < span class = "s1" > ' < / span > < span class = "si" > %s< / span > < span class = "s1" > @feed< / span > < span class = "si" > %s< / span > < span class = "s1" > ' < / span > < span class = "o" > %< / span > < span class = "p" > (< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > record< / span > < span class = "o" > .< / span > < span class = "n" > path< / span > < span class = "p" > ,< / span >
< span class = "s1" > ' /' < / span > < span class = "o" > +< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > version< / span > < span class = "k" > if< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > version< / span > < span class = "o" > !=< / span > < span class = "s1" > ' default' < / span > < span class = "k" > else< / span > < span class = "s1" > ' ' < / span > < span class = "p" > ,< / span >
< span class = "p" > )< / span >
< span class = "nd" > @property< / span >
< span class = "k" > def< / span > < span class = "nf" > url_path< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "k" > return< / span > < span class = "n" > build_url< / span > < span class = "p" > ([< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > record< / span > < span class = "o" > .< / span > < span class = "n" > url_path< / span > < span class = "p" > ,< / span > < span class = "s1" > ' feed.xml' < / span > < span class = "p" > ])< / span >
< span class = "k" > def< / span > < span class = "nf" > on_setup_env< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > extra< / span > < span class = "p" > ):< / span >
< span class = "nd" > @self< / span > < span class = "o" > .< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > virtualpathresolver< / span > < span class = "p" > (< / span > < span class = "s1" > ' feed' < / span > < span class = "p" > )< / span >
< span class = "k" > def< / span > < span class = "nf" > resolve_virtual_path< / span > < span class = "p" > (< / span > < span class = "n" > record< / span > < span class = "p" > ,< / span > < span class = "n" > pieces< / span > < span class = "p" > ):< / span >
< span class = "k" > if< / span > < span class = "ow" > not< / span > < span class = "n" > pieces< / span > < span class = "p" > :< / span >
< span class = "k" > return< / span > < span class = "n" > Feed< / span > < span class = "p" > (< / span > < span class = "n" > record< / span > < span class = "p" > )< / span >
< span class = "k" > elif< / span > < span class = "n" > pieces< / span > < span class = "o" > ==< / span > < span class = "p" > [< / span > < span class = "s1" > ' recent' < / span > < span class = "p" > ]:< / span >
< span class = "k" > return< / span > < span class = "n" > Feed< / span > < span class = "p" > (< / span > < span class = "n" > record< / span > < span class = "p" > ,< / span > < span class = "n" > version< / span > < span class = "o" > =< / span > < span class = "s1" > ' recent' < / span > < span class = "p" > )< / span >
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