Depentend Comboboxes in QGIS 2.8.2

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maybe you can help me.

I´m setting up an database for an archaeological project with PSQL. There I have a field "material" connected with a table "materials" containing things like metal, stone, etc. In a third table I have stored more specific data on the materials like "gold", "iron" or "tuff". The all cary an attribute to which material they belong.

Now I set up a custom form in QGIS which works quite well. But now to my problem: I want to choose a material in the fist combobox and the specification in a second one. The entries of that field should be filtered by the first one. So when I choose "metal" in the first field the second field should just show me iron, gold and copper.

I hope you can offer me some advice to solve that problem.

Thanks in advance.

Cheers,

Matthias



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