Ruby app: link_to 'delete' looking for GET - ruby-on-rails

Question

I realize this question has been asked many times, but I've tried all the solutions I can find, and have gotten nowhere.
In my view, I have
= link_to "Delete", evint_path(e), :method => :delete, data: {:confirm => 'Are you sure?'}
where e is an instance of evint. I keep getting error messages declaring that I'm missing a GET method for evint:
No route matches [GET] "/evints/5"
This isn't even the case! When I rake routes, I have a GET route for evints.
I have jquery-rails in my Gemfile; I have "require jquery_ujs" in my application.js file. I have five other apps on the same system that work, so I don't think it's a system problem.
The html being generated by my code looks OK:
<a rel="nofollow" href="/evints/5" data-method="delete" data-confirm="Are you sure?">Delete</a>
I've tried removing "//= require tree ." from my application.js file, but that didn't make any difference.
I'm also having trouble signing out of my app, as devise's destroy_session also isn't working!
Does anybody have any ideas? This is driving me crazy!
EDIT: Here are my routes:
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
user_confirmation POST /users/confirmation(.:format) devise/confirmations#create
new_user_confirmation GET /users/confirmation/new(.:format) devise/confirmations#new
GET /users/confirmation(.:format) devise/confirmations#show
interests GET /interests(.:format) interests#index
POST /interests(.:format) interests#create
new_interest GET /interests/new(.:format) interests#new
edit_interest GET /interests/:id/edit(.:format) interests#edit
interest GET /interests/:id(.:format) interests#show
PATCH /interests/:id(.:format) interests#update
PUT /interests/:id(.:format) interests#update
DELETE /interests/:id(.:format) interests#destroy
events GET /events(.:format) events#index
POST /events(.:format) events#create
new_event GET /events/new(.:format) events#new
edit_event GET /events/:id/edit(.:format) events#edit
event GET /events/:id(.:format) events#show
PATCH /events/:id(.:format) events#update
PUT /events/:id(.:format) events#update
DELETE /events/:id(.:format) events#destroy
images GET /images(.:format) images#index
POST /images(.:format) images#create
new_image GET /images/new(.:format) images#new
image GET /images/:id(.:format) images#show
DELETE /images/:id(.:format) images#destroy
evints GET /evints(.:format) evints#index
POST /evints(.:format) evints#create
new_evint GET /evints/new(.:format) evints#new
evint DELETE /evints/:id(.:format) evints#destroy
projects GET /projects(.:format) projects#index
POST /projects(.:format) projects#create
new_project GET /projects/new(.:format) projects#new
edit_project GET /projects/:id/edit(.:format) projects#edit
project PATCH /projects/:id(.:format) projects#update
PUT /projects/:id(.:format) projects#update
projectimages GET /projectimages(.:format) projectimages#index
POST /projectimages(.:format) projectimages#create
new_projectimage GET /projectimages/new(.:format) projectimages#new
projectimage GET /projectimages/:id(.:format) projectimages#show
DELETE /projectimages/:id(.:format) projectimages#destroy
welcome_index GET /welcome/index(.:format) welcome#index
root GET / welcome#index
welcome_readpdf GET /welcome/readpdf(.:format) welcome#readpdf