Remove URL methods in models

We can use `polymorphic_path` since commit ff93f5a591.

spec/shared/system/relationable.rb

@@ -8,25 +8,25 @@ shared_examples "relationable" do |relationable_model_name|
   scenario "related contents are listed" do
     create(:related_content, parent_relationable: relationable, child_relationable: related1, author: build(:user))
 
-    visit relationable.url
+    visit polymorphic_path(relationable)
     within("#related-content-list") do
       expect(page).to have_content related1.title
     end
 
-    visit related1.url
+    visit polymorphic_path(related1)
     within("#related-content-list") do
       expect(page).to have_content relationable.title
     end
   end
 
   scenario "related contents list is not rendered if there are no relations" do
-    visit relationable.url
+    visit polymorphic_path(relationable)
     expect(page).not_to have_css "#related-content-list"
   end
 
   scenario "related contents can be added" do
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     expect(page).not_to have_css "#related_content"
     expect(page).to have_css ".add-related-content[aria-expanded='false']"
@@ -36,7 +36,7 @@ shared_examples "relationable" do |relationable_model_name|
     expect(page).to have_css ".add-related-content[aria-expanded='true']"
 
     within("#related_content") do
-      fill_in "Link to related content", with: "#{url}#{related1.url}"
+      fill_in "Link to related content", with: "#{url}#{polymorphic_path(related1)}"
       click_button "Add"
     end
 
@@ -44,7 +44,7 @@ shared_examples "relationable" do |relationable_model_name|
       expect(page).to have_content related1.title
     end
 
-    visit related1.url
+    visit polymorphic_path(related1)
 
     within("#related-content-list") do
       expect(page).to have_content relationable.title
@@ -53,7 +53,7 @@ shared_examples "relationable" do |relationable_model_name|
     click_button "Add related content"
 
     within("#related_content") do
-      fill_in "Link to related content", with: "#{url}#{related2.url}"
+      fill_in "Link to related content", with: "#{url}#{polymorphic_path(related2)}"
       click_button "Add"
     end
 
@@ -64,7 +64,7 @@ shared_examples "relationable" do |relationable_model_name|
 
   scenario "if related content URL is invalid returns error" do
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     click_button "Add related content"
 
@@ -78,12 +78,12 @@ shared_examples "relationable" do |relationable_model_name|
 
   scenario "returns error when relating content URL to itself" do
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     click_button "Add related content"
 
     within("#related_content") do
-      fill_in "Link to related content", with: url + relationable.url.to_s
+      fill_in "Link to related content", with: url + polymorphic_path(relationable)
       click_button "Add"
     end
 
@@ -102,7 +102,7 @@ shared_examples "relationable" do |relationable_model_name|
       related = create(:debate, title: "My path is the only one I've walked")
 
       login_as(user)
-      visit relationable.url
+      visit polymorphic_path(relationable)
 
       click_button "Add related content"
 
@@ -120,12 +120,12 @@ shared_examples "relationable" do |relationable_model_name|
   scenario "returns an error when the related content already exists" do
     create(:related_content, parent_relationable: relationable, child_relationable: related1)
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     click_button "Add related content"
 
     within("#related_content") do
-      fill_in "url", with: url + related1.url.to_s
+      fill_in "url", with: url + polymorphic_path(related1)
       click_button "Add"
     end
 
@@ -136,7 +136,7 @@ shared_examples "relationable" do |relationable_model_name|
     related_content = create(:related_content, parent_relationable: relationable, child_relationable: related1, author: build(:user))
 
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     within("#related-content-list") do
       click_link "Yes"
@@ -153,7 +153,7 @@ shared_examples "relationable" do |relationable_model_name|
     related_content = create(:related_content, parent_relationable: relationable, child_relationable: related1, author: build(:user))
 
     login_as(user)
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     within("#related-content-list") do
       click_link "No"
@@ -179,7 +179,7 @@ shared_examples "relationable" do |relationable_model_name|
 
     login_as(user)
 
-    visit relationable.url
+    visit polymorphic_path(relationable)
 
     expect(page).not_to have_css "#related-content-list"
   end