Nicolas, I have not looked at this in too much detail, but at a quick glance, could it not be the fact that you should be using the newly created fields? As in instead of @NamelengthField != @NamelengthField || '2', should it not be more like your previous example Length != Length2
Regards, Richard —— Richard McDonnell MSc GIS, FME Certified Professional FRM Data Management —— Oifig na nOibreacha Poiblí Office of Public Works Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 Jonathan Swift Street, Trim, Co Meath, C15 NX36 —— M +353 87 688 5964 T +353 46 942 2409 https://gov.ie/opw —— To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/[email protected] Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ From: Qgis-user <[email protected]> On Behalf Of Nicolas Cadieux Sent: 20 July 2021 09:27 To: Qgis Users List <[email protected]> Subject: Re: [Qgis-user] Problem using Model Inputs variable in an Select by expression in the model Designer Hi, Does anyone have an idea? Nicolas Cadieux https://gitlab.com/njacadieux Le 8 juill. 2021 à 01:17, Nicolas Cadieux <[email protected]<mailto:[email protected]>> a écrit : Hi, I am creating a model that fixes Network files before they are used in the QGIS Network analysis (Shortest path) tools. This is my work flow: 1. Create a "Length" field (value) and calculate $length in the field calculator 2. Split the Multipart lines into Singlepart lines 3. Create a "Length2" field (value) and calculate $length in the field calculator 4. Select by expression Length != Length2. This basically gives me a selection of line that have been modified by the Multipart to Singlepart algorithm. (I get 8 results) This works well The problem is when I create and Input String to let the user create a "Length" field. This become a variable called @NamelengthField. My work flow become: 1. User input "Length" in the Model input. (@NamelengthField) 2. Create a "Length" field using @NamelengthField (as pre-calculated value) and calculate $length in the field calculator: This is OK 3. Split the Multipart lines into Singlepart lines: This is OK 4. Create a "Length2" field using @NamelengthField ||'2' (as pre-calculated value) and calculate $length in the field calculator: This is OK this field (Length2) is created and calculated properly. 5. I get stuck when I try Select by expression using @NamelengthField != @NamelengthField || '2' (as pre-calculated value) (I get all lines back) and the test does not work. I tried stuff like @NamelengthField != (@NamelengthField || '2') '@NamelengthField != @NamelengthField || '2'' "@NamelengthField != @NamelengthField || '2'" "@NamelengthField"|| !=|| "@NamelengthField || '2'" Even simple @NamelengthField = 5.286365157529550 (which should extract exactly one value). Any ideas? Nicolas QGIS 3.18.2 on Windows 10 -- Nicolas Cadieux https://gitlab.com/njacadieux
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