Filter values out of a msg - this has got to be simple!

[Ben Post]

what exactly do I write in function node to filter out wspd, gust and wdir from the following message??

thanks!

msg : Object{ "_msgid": "ec5f5f5d.13a0a", "topic": "", "payload": "", "observation": { "key": "94614", "class": "observation", "expire_time_gmt": 1472112000, "obs_id": "94614", "obs_name": "Swanbourne", "valid_time_gmt": 1472104800, "day_ind": "D", "temp": 18, "wx_icon": null, "icon_extd": null, "wx_phrase": null, "pressure_tend": null, "pressure_desc": null, "dewPt": 5, "heat_index": 18, "rh": 43, "pressure": null, "vis": null, "wc": 18, "wdir": 50, "wdir_cardinal": "NE", "gust": null, "wspd": 15, "max_temp": null, "min_temp": null, "precip_total": null, "precip_hrly": null, "snow_hrly": null, "uv_desc": "Moderate", "feels_like": 18, "uv_index": 4, "qualifier": null, "qualifier_svrty": null, "blunt_phrase": null, "terse_phrase": null, "clds": null, "water_temp": null, "primary_wave_period": null, "primary_wave_height": null, "primary_swell_period": null, "primary_swell_height": null, "primary_swell_direction": ....

[ghe...@me.com]

You should be able to do it without a function node

Assuming you want to extract the values for these two items

====>SPLIT_NODE======================>SWITCH_NODE======>

          with the split set to the                                   with property set to msg.parts.index

           item wanted ie wspd                                     and switch item set to == " type" number 1

so for wspd should return 15

I think

[Alisdair Smyth]

Within a function node, 

delete msg.observation.wspd;
delete msg.observation.gust;
delete msg.observation.wdir;

Alternatively you could use the change node, and implement three "delete" rules.  One for each property you don't want - msg.observation.wspd, msg.observation.gust and msg.observation.wdir. 

[Ben Post]

Thanks, sorry my request was poorly worded. How do I pick out only those fields "wspd", "gust" etc.?

a filter node would be nice!?

Cheers

[Nicholas O'Leary]

Hi Ben,

what do you want the resulting message to look like? Do you still want msg.observation to exist, but just have those three properties in it? For example:

{ "_msgid": "ec5f5f5d.13a0a", "topic": "", "payload": "", "observation": { "wspd": 123, "gust": null, "wdir":50} }

In a function node you could do:

  var observation = {

      wspd: msg.observation.wspd,

      gust: msg.observation.gust,

      wdir: msg.observation.wdir

  }

  msg.observation = observation;

  return msg;

Nick

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[Ben Post]

There it is, thanks very much!

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[Henrik Kamvåg]

I'd just use the switch node and use '== msg.payload.wspd', '== msg.payload.gust', '== msg.payload.wdir' and finaly a 'otherwise'.
Now they are all filtered and the rest is tossed. 

[Henrik Kamvåg]

Use the switch tool. Sort on your properties and finnish of with a 'otherwise'.

Den torsdag 25 augusti 2016 kl. 08:30:43 UTC+2 skrev Ben Post:

[Nicholas O'Leary]

Henrik,

The Switch node does not remove properties from a message. It doesn't help in this scenario.

Nick

[Ben Post]

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[sebasti...@gmail.com]

You may look at http://flows.nodered.org/node/node-red-contrib-objectcleaner as well