Outputs

[tlrobinson]

I think there should be an output for each property of an RSS entry (title, description, url, etc), rather than just one called "entries" (also all output names should be singular, right?)

[matthewhudson]

I think an output for each entry of an RSS works best with the pubsubhubbub RSS Trigger, whereas this is a RSS Action.

Tom - did I understand your suggestion correctly?

Jeff - can you weigh in here?

[tlrobinson]

This isn't really an action, is it? Combined with a "cron" trigger it would be a polling RSS trigger, so I'd expect it to have the same outputs as a pubsubhubub RSS trigger.

[matthewhudson]

I think it's firmly in the action camp. You could combine it with the cron
trigger, but you would still need a dedup action or some other block to
only display the newest item in the feed.

On Tue, Nov 27, 2012 at 5:14 PM, Tom Robinson [email protected]:

This isn't really an action, is it? Combined with a "cron" trigger it
would be a polling RSS trigger, so I'd expect it to have the same outputs
as a pubsubhubub RSS trigger.

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Matthew Hudson
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[progrium]

Yeah, I think most output names should be singular unless you really are
nesting. And if you're nesting you might not be doing it right because, for
example, this seems like it should return an array of outputs that are
entries. Is that how pubsubhubbub works? I don't see why this would work
any different, otherwise, the pipeline executer won't know what to do with
them ... although maybe that's intentional?

On Tue, Nov 27, 2012 at 2:26 PM, Matthew Hudson [email protected]:

I think it's firmly in the action camp. You could combine it with the cron
trigger, but you would still need a dedup action or some other block to
only display the newest item in the feed.

On Tue, Nov 27, 2012 at 5:14 PM, Tom Robinson [email protected]:

This isn't really an action, is it? Combined with a "cron" trigger it
would be a polling RSS trigger, so I'd expect it to have the same
outputs
as a pubsubhubub RSS trigger.

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Reply to this email directly or view it on GitHub<
https://github.com/webpipes/block-parse-rss/issues/1#issuecomment-10779930>.

V/R

Matthew Hudson
Website http://www.matthewghudson.com/ | Blog<
http://blog.matthewghudson.com/>
| Facebook http://facebook.com/matthewghudson |
Google+https://plus.google.com/u/0/103902048207396109122/posts|
Twitter http://twitter.com/matthewgh

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Jeff Lindsay
http://progrium.com

[tlrobinson]

Well, if the two options are "trigger" and "action" then it's an action, but I'd rather just call it a block since it has outputs. But that's irrelevant.

The way I see the "dedup" block working is it would have a "key" input used for identifying duplicates, and a "" input you could use to passthrough the rest of the fields, which would be mirrored as outputs (so maybe we need a "" output as well?). You'd connect the individual RSS field outputs from the RSS parse block to the dedup block, then each output to the next block.

Granted this approach will be tedious for records with many fields, but if you just connect an "entry" output then the field names can't be propagated to "downstream" blocks.

Also I'm still a bit confused and concerned about how blocks that output multiple records will work. Say you have two blocks that can output multiple records connected to two different inputs on a 3rd block, how does the executor "merge" the records?

[progrium]

Also I'm still a bit confused and concerned about how blocks that output
multiple records will work. Say you have two blocks that can output
multiple records connected to two different inputs on a 3rd block, how does
the executor "merge" the records?

In theory it might have a lot to do with the dependency resolution and
which one is tied to a trigger. If they both are maybe it gets weird. But
that's why in theory is hard. Do you have a concrete example that we can
try to make work?

Jeff Lindsay
http://progrium.com

[tlrobinson]

The problem is I can't think of a concrete example, but right now there's
nothing stopping you from setting up such a pipeline in the pipeline editor
/ pipeline definition. I'm wondering if / how we should constrain pipelines
so nonsense pipelines aren't possible.

Maybe restricting a pipeline to having a single trigger or other block that
can output multiple records, or something like that.

On Tue, Nov 27, 2012 at 3:44 PM, Jeff Lindsay [email protected]:

Also I'm still a bit confused and concerned about how blocks that output
multiple records will work. Say you have two blocks that can output
multiple records connected to two different inputs on a 3rd block, how
does
the executor "merge" the records?

In theory it might have a lot to do with the dependency resolution and
which one is tied to a trigger. If they both are maybe it gets weird. But
that's why in theory is hard. Do you have a concrete example that we can
try to make work?

Jeff Lindsay
http://progrium.com

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/1#issuecomment-10783132.

[progrium]

Yeah I was already under the impression there's only one pure trigger.

On Tue, Nov 27, 2012 at 3:53 PM, Tom Robinson [email protected]:

The problem is I can't think of a concrete example, but right now there's
nothing stopping you from setting up such a pipeline in the pipeline
editor
/ pipeline definition. I'm wondering if / how we should constrain
pipelines
so nonsense pipelines aren't possible.

Maybe restricting a pipeline to having a single trigger or other block
that
can output multiple records, or something like that.

On Tue, Nov 27, 2012 at 3:44 PM, Jeff Lindsay [email protected]:

Also I'm still a bit confused and concerned about how blocks that
output
multiple records will work. Say you have two blocks that can output
multiple records connected to two different inputs on a 3rd block, how
does
the executor "merge" the records?

In theory it might have a lot to do with the dependency resolution and
which one is tied to a trigger. If they both are maybe it gets weird.
But
that's why in theory is hard. Do you have a concrete example that we can
try to make work?

Jeff Lindsay
http://progrium.com

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Reply to this email directly or view it on GitHub<
https://github.com/webpipes/block-parse-rss/issues/1#issuecomment-10783132>.

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Reply to this email directly or view it on GitHubhttps://github.com//issues/1#issuecomment-10783394.

Jeff Lindsay
http://progrium.com

[tlrobinson]

But allowing any block to output multiple records is also an issue.

[progrium]

Right, because it effectively becomes a trigger. Hmm..

On Tue, Nov 27, 2012 at 4:04 PM, Tom Robinson [email protected]:

But allowing any block to output multiple records is also an issue.

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Reply to this email directly or view it on GitHubhttps://github.com//issues/1#issuecomment-10783715.

Jeff Lindsay
http://progrium.com