Hi,
In a custom visual I am developing (using a table data view mapping) I am trying derive which data fields are put into which data roles in the interface. Does anyone have suggestions as to do that?
I can iterate through the list of columns, read the keys in their "roles" object, and construct the hierarchy myself that way (using the keys from the list of data roles I have defined in capabilities.json). However, I wonder if Power BI doesn't a more explicit way of doing this, as the data fields mapping to data roles is explicitly defined in the interface. Does anyone know?
As mentioned, the custom visualization uses a table data view mapping. To construct the I have declared a series of data roles, which works as semantic groupings, which is understandable. I then select all these data roles in table.rows.select using a list of { "for": { "in": "..." } } matching the data roles. I don't fully understand the effect of the "group" key used for the categorical view mapping: https://github.com/Microsoft/PowerBI-visuals/blob/master/Capabilities/DataViewMappings.md (or whether that is applicable for the table data view mapping), but perhaps that could be a way to go?
Any way, any help is greatly appreciated 