The load_and_authorize_resource helper method from CanCanCan was
unable to detect that ReposController#show should be getting a single
Repo instance rather than the collection of all Repo instances because
it was looking for params to have an :id key.
In our case, because the show action has a nested Cohort resource
the route parameters are :repo_id and :cohort_id. We now specify to
load_and_authorize_resource that it should look for :repo_id.
The
load_and_authorize_resourcehelper method from CanCanCan was unable to detect thatReposController#showshould be getting a single Repo instance rather than the collection of all Repo instances because it was looking forparamsto have an:idkey.In our case, because the
showaction has a nestedCohortresource the route parameters are:repo_idand:cohort_id. We now specify toload_and_authorize_resourcethat it should look for:repo_id.