Use just one action to hide users

Other than removing a redundant action, we're fixing two bugs when
blocking an author using the links in the public views:

* We were always redirecting to the debates index, even if we blocked
  the author of a proposal or an investment
* We weren't showing any kind of success message

spec/controllers/moderation/users_controller_spec.rb

@@ -2,14 +2,32 @@ require "rails_helper"
 
 describe Moderation::UsersController do
   before { sign_in create(:moderator).user }
+  let(:user) { create(:user, email: "user@consul.dev") }
 
-  describe "PUT hide_in_moderation_screen" do
+  describe "PUT hide" do
     it "keeps query parameters while using protected redirects" do
-      user = create(:user, email: "user@consul.dev")
-
-      get :hide_in_moderation_screen, params: { id: user, search: "user@consul.dev", host: "evil.dev" }
+      get :hide, params: { id: user, search: "user@consul.dev", host: "evil.dev" }
 
       expect(response).to redirect_to "/moderation/users?search=user%40consul.dev"
     end
+
+    it "redirects to the index of the section where it was called with a notice" do
+      proposal = create(:proposal, author: user)
+      request.env["HTTP_REFERER"] = proposal_path(proposal)
+
+      put :hide, params: { id: user }
+
+      expect(response).to redirect_to proposals_path
+      expect(flash[:notice]).to eq "User blocked. All of this user's debates and comments have been hidden."
+    end
+
+    it "redirects to the index with a nested resource" do
+      investment = create(:budget_investment, author: user)
+      request.env["HTTP_REFERER"] = budget_investment_path(investment.budget, investment)
+
+      put :hide, params: { id: user }
+
+      expect(response).to redirect_to budget_investments_path(investment.budget)
+    end
   end
 end