error in assemble for new version dolfin * _domains remove

Question

i need to calculate effort on boundary of cylindre and i use this santence :

assemble(dot(FacetNormal(mesh),sigma(u0,p0))[0]*ds(13),exterior_facet_domains=boundaries,mesh=mesh)

but i have this message error :

Parameters *_domains of assemble has been deprecated in DOLFIN version 1.4.0.
It will be removed from version 1.6.0.
Parameter *_domains of assemble will be removed. Include this in the ufl form instead.

how remplace exterior_facet_domains in the new version dolfin for calculate effort on boudaries of cylindre ?

Answer 1

Include everything in the Measure:

assemble(dot(FacetNormal(mesh),sigma(u0,p0))[0]*ds(13, domain=mesh, subdomain_data=boundaries))