Nested rules in QGIS 2.18

Question

I work with QGIS 2.18. I have a polygon shapefile with two atrributes: id (unique for each polygon) and type.

I visualize the shapefile using the "type" attribute, but I would like to add a nested rule or category using the "id". When I try to do that, for each type, all the available ids are added when, what I want is to add only the ids that correspond to the type I am modifying.

For example, if I have

"id" "type"   
  0  forest
  1  road
  2  road
  3  river
  4  forest
  5  building
  6  river

I would like to have:

• One category for 'forest' with the nested values of "id" 0 and 4
• One category for 'road' with the nested values of "id" 1 and 2
• One category for 'river' with the nested values of "id" 3 and 6
• One category for 'building' with the nested values of "id" 5

For 6 features it is simple, but I have 200 hundreds of them.

The goal is to keep the visualization by type and to be able to hide/show the features that I am interested in.

I know I can use the filter option, but when the filter is active I loose the ability to edit the file. I could also split the file using the "type attribute" but I would like to avoid doing that and to keep everything in one file.

Is there a way to do that?

Answer 1

Go to layer > properties > style

Choose Categorized as styling-preference

Now set column to 'type' and click Classify.

Every single category will show up.

If you just want to visualise one category-type at a time, you can uncheck the others in the legend of the TOC.