What is the difference of Data and Params ?, And what is fields and how to utilized fields

[okaprinarjaya]

Hi @williamthome

• What is the difference of Data and Params ?
• What is fields[] and how to utilize it?
• Why fields always empty list?
• Why data always empty map?

Valid Input

{changeset,[],
           #{name => binary,starring => binary},
           [name],
           #{},
           #{name => <<"Erlang the movie">>},
           [],
           [undefined,<<>>]}

Invalid Input

{changeset,[],
           #{name => binary,starring => binary},
           [name],
           #{},#{},
           [{name,{<<"is required">>,#{validation => is_required}}}],
           [undefined,<<>>]}

Both Valid and Invalid input always returning empty list [] for fields parameter, and empty map #{} in data parameter.

Thank you 🙏