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Add another example for the get operator (#7351)

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yaisog 2023-03-10 16:57:51 +01:00 committed by GitHub
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editions/tw5.com/tiddlers/filters/examples/get.tid
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@ -1,5 +1,5 @@
created: 20150118134611000
modified: 20230309180521925
modified: 20230310154010278
myfield:
tags: [[get Operator]] [[Operator Examples]]
title: get Operator (Examples)
@ -16,4 +16,7 @@ type: text/vnd.tiddlywiki
<<.operator-example 4 "[all[current]get[myfield]]" "the empty value of field <<.field myfield>> is not returned by the <<.olink get>> operator">>
<<.operator-example 5 "[all[current]] :filter[has:field[myfield]] :map[get[myfield]]" "also returns the empty string">>
The above example works by first using the [[Filter Filter Run Prefix]] to only select titles that have the field <<.field myfield>> and then using the [[Map Filter Run Prefix]] to replace those titles with their value of that field. The [[Map Filter Run Prefix]] outputs an empty string when its filter run returns an empty [[selection|Title Selection]].
The above example works by first using the [[Filter Filter Run Prefix]] to only select titles that have the field <<.field myfield>> and then using the [[Map Filter Run Prefix]] to replace those titles with their value of that field. The [[Map Filter Run Prefix]] outputs an empty string when its filter run returns an empty [[selection|Title Selection]].
<<.operator-example 6 "[all[tiddlers]] :filter[get[created]compare:date:lt{HelloThere!!created}]" "return all tiddlers that are older than [[HelloThere]]">>
The above example demonstrates two different ways of accessing field values in filters: Use <<.olink get>> when the title is not known in advance as with the [[Filter Filter Run Prefix]] where <<.var currentTiddler>> is set to the current input title. Use a [[TextReference]] as an indirect [[Filter Parameter]] when the title is known.