I am looking to find the correct syntax for copying a defined set of fields when using the "Join attributes by field value tool" in the graphical modeler in QGIS 3.6.

I would like to know how the syntax for this when selecting multiple fields as I cannot seem to work it out. For example if I only wanted to join "Field_1" and "Field_2".

Please see my image below:

enter image description here

  • Have you tried choosing said fields outside the modeller and copying the style of that notation into the modeller?
    – Erik
    May 15, 2019 at 14:08
  • I thought about that too but it only shows the number of items selected because you choose from a drop down.
    – AWGIS
    May 15, 2019 at 14:10
  • Protocol shows the python-code to be 'FIELDS_TO_COPY' : ['column1',column2'] - maybe if you write the columns out using this syntaX?
    – Erik
    May 15, 2019 at 14:24
  • @Erik thank you for the suggestion - it doesn't appear to work unfortunately.
    – AWGIS
    May 15, 2019 at 15:10
  • I guess you tried a syntax analogue to the field calculator, like "column1","column2" ?
    – Erik
    May 15, 2019 at 17:02

1 Answer 1


Seperate them with a semicolon: field1;field2

  • Thank you, I can't believe it was that simple!
    – AWGIS
    May 16, 2019 at 7:56

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