TheCubicWebBook #1272545 explain what to do when a view is not diplayed [open]

Explain in view section and in FAQ :

  1. first check that the view is well registered (see log at the application start, explain that logs are ordered (cubicweb, other cubes, our cube)
  2. check that the view has a __regid__ attribute or inherits from a class which has this attribute, and that the __regid__ is the correct one.
  3. check that the sum of score's selectors is higher than other class with the same __regid__
  4. as a last resort, use with traced_selection() to understand why your view is not selected (explain where you have to put this statement (not clear in FAQ))
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