CustomLinks: Pass referential directly when initialising

Instead of getting the referential to use when building the polymorphic
URL from the `UserContext`, pass in a referential directly.

The old code that used `user_context.context[:referential]` relied on
the fact that `ApplicationController#pundit_user` was defined as
follows:

     def pundit_user
       UserContext.new(current_user, referential: self.try(:current_referential))
     end

(We pass `pundit_user` into `CustomLinks` from
`TableBuilderHelper#build_links`.)

However, Robert's change 747d333ffbcc8ee0c9f1daf93ccca32799434e04
removes the `current_referential` call from `#pundit_user`. In
`CustomLinks`, we actually always want to be using
`current_referential`.

For example, on `Companies#index` (/line_referentials/:id/companies),
`CustomLinks` fails to build a correct #show link because
`user_context.context[:referential]` is `nil`, when it should instead be
a `LineReferential` object, that gets returned by the
`#current_referential` helper method. Sure, `#current_referential` is
hard to understand, so maybe we'll change that around in the future, but
this at least allows us to use the current referential in `CustomLinks`.

Refs #3479

3 files changed, 21 insertions, 7 deletions

diff --git a/app/helpers/table_builder_helper.rb b/app/helpers/table_builder_helper.rb
index d82f1eb03..897e842a8 100644
--- a/app/helpers/table_builder_helper.rb
+++ b/app/helpers/table_builder_helper.rb
@@ -157,7 +157,7 @@ module TableBuilderHelper
 
     menu = content_tag :ul, class: 'dropdown-menu' do
       (
-        CustomLinks.new(item, pundit_user, links).links +
+        CustomLinks.new(item, pundit_user, links, referential).links +
         item.action_links.select { |link| link.is_a?(Link) }
       ).map do |link|
         gear_menu_link(link)
diff --git a/app/helpers/table_builder_helper/custom_links.rb b/app/helpers/table_builder_helper/custom_links.rb
index 4e385b266..b1bb11f10 100644
--- a/app/helpers/table_builder_helper/custom_links.rb
+++ b/app/helpers/table_builder_helper/custom_links.rb
@@ -8,12 +8,13 @@ module TableBuilderHelper
       unarchive: :put
     }
 
-    attr_reader :actions, :object, :user_context
+    attr_reader :actions, :object, :user_context, :referential
 
-    def initialize(object, user_context, actions)
+    def initialize(object, user_context, actions, referential = nil)
       @object       = object
       @user_context = user_context
       @actions      = actions
+      @referential  = referential
     end
 
     def links
@@ -33,10 +34,7 @@ module TableBuilderHelper
         polymorph_url << action
       end
 
-      polymorph_url += URL.polymorphic_url_parts(
-        object,
-        user_context.context[:referential]
-      )
+      polymorph_url += URL.polymorphic_url_parts(object, referential)
     end
 
     def method_for_action(action)
diff --git a/spec/helpers/table_builder_helper/custom_links_spec.rb b/spec/helpers/table_builder_helper/custom_links_spec.rb
index d6fbd2c64..ac60c7da3 100644
--- a/spec/helpers/table_builder_helper/custom_links_spec.rb
+++ b/spec/helpers/table_builder_helper/custom_links_spec.rb
@@ -1,4 +1,20 @@
 describe TableBuilderHelper::CustomLinks do
+  describe "#polymorphic_url" do
+    it "returns the correct URL path for Companies#show" do
+      company = build_stubbed(:company)
+      user_context = UserContext.new(build_stubbed(:user))
+
+      expect(
+        TableBuilderHelper::CustomLinks.new(
+          company,
+          user_context,
+          [:show],
+          company.line_referential
+        ).polymorphic_url(:show)
+      ).to eq([company.line_referential, company])
+    end
+  end
+
   describe "#authorized_actions" do
     it "includes :show" do
       referential = build_stubbed(:referential)