How to fill Field Mappings parameter in script tool on updateParameters?

Question

My goal is to get a list of fields choosen by an user from existing fields in feature class. I think that I can show all fields in Field Mappings dialog, an user deletes unwanted fields and I get a required list.

The problem is how to populate Field Mappings when adding a feature class as a first parameter. I can't select anything in 'Obtained from' property.
The code self.params[1].parameterDependencies = [0] in updateParameters function does't work in this case (it worked when 'Field' parameter data type was chosen).

What should I use to automatically populate Field Mappings when filling first parameter?

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EDIT:
Fields list is applied as follows: enter image description here

Answer 1

Under your Fields to Choose option, change it to Field instead of Field Mappings. That will give you a list of the feature layer fields.

• Marcin: I know it. But I want to be able to select more than one field.
• artwork21: Change MultiValue from No to Yes.