Remove duplication in poll actions tables

We were using the same logic in four different places, so we're creating
a new class to handle that logic.

Note that I didn't find a way to delegate the `content` method to a
`Admin::TableActionsComponent`, so we're delegating the `action` method
instead. That means we need to create a method returning an
`Admin::TableActionsComponent`. We also need to cache this object;
otherwise we were getting an error when calling `actions.action` from
the `Admin::Poll::Questions::TableActionsComponent`.

app/components/admin/allowed_table_actions_component.html.erb

@@ -0,0 +1,3 @@
+<%= render table_actions_component do %>
+  <%= content %>
+<% end %>

app/components/admin/allowed_table_actions_component.rb

@@ -0,0 +1,20 @@
+class Admin::AllowedTableActionsComponent < ApplicationComponent
+  attr_reader :record, :options
+  delegate :can?, to: :helpers
+  delegate :action, to: :table_actions_component
+
+  def initialize(record, **options)
+    @record = record
+    @options = options
+  end
+
+  private
+
+    def actions
+      (options[:actions] || [:edit, :destroy]).select { |action| can?(action, record) }
+    end
+
+    def table_actions_component
+      @table_actions_component ||= Admin::TableActionsComponent.new(record, **options.merge(actions: actions))
+    end
+end

app/components/admin/poll/questions/answers/documents/table_actions_component.html.erb

@@ -1,9 +1,8 @@
-<%= render Admin::TableActionsComponent.new(document,
-                                            actions: actions,
-                                            destroy_path: document_path(document)) do |table_actions| %>
-  <%= table_actions.action(:download,
-                           text: t("documents.buttons.download_document"),
-                           path: document.attachment,
-                           target: "_blank",
-                           rel: "nofollow") %>
+<%= render Admin::AllowedTableActionsComponent.new(document,
+                                                   destroy_path: document_path(document)) do |actions| %>
+  <%= actions.action(:download,
+                     text: t("documents.buttons.download_document"),
+                     path: document.attachment,
+                     target: "_blank",
+                     rel: "nofollow") %>
 <% end %>

app/components/admin/poll/questions/answers/documents/table_actions_component.rb

@@ -1,14 +1,7 @@
 class Admin::Poll::Questions::Answers::Documents::TableActionsComponent < ApplicationComponent
   attr_reader :document
-  delegate :can?, to: :helpers
 
   def initialize(document)
     @document = document
   end
-
-  private
-
-    def actions
-      [:destroy].select { |action| can?(action, document) }
-    end
 end

app/components/admin/poll/questions/answers/table_actions_component.html.erb

@@ -1 +1 @@
-<%= render Admin::TableActionsComponent.new(answer, actions: actions) %>
+<%= render Admin::AllowedTableActionsComponent.new(answer) %>

app/components/admin/poll/questions/answers/table_actions_component.rb

@@ -1,14 +1,7 @@
 class Admin::Poll::Questions::Answers::TableActionsComponent < ApplicationComponent
   attr_reader :answer
-  delegate :can?, to: :helpers
 
   def initialize(answer)
     @answer = answer
   end
-
-  private
-
-    def actions
-      [:edit, :destroy].select { |action| can?(action, answer) }
-    end
 end

app/components/admin/poll/questions/answers/videos/table_actions_component.html.erb

@@ -1 +1 @@
-<%= render Admin::TableActionsComponent.new(video, actions: actions) %>
+<%= render Admin::AllowedTableActionsComponent.new(video) %>

app/components/admin/poll/questions/answers/videos/table_actions_component.rb

@@ -1,14 +1,7 @@
 class Admin::Poll::Questions::Answers::Videos::TableActionsComponent < ApplicationComponent
   attr_reader :video
-  delegate :can?, to: :helpers
 
   def initialize(video)
     @video = video
   end
-
-  private
-
-    def actions
-      [:edit, :destroy].select { |action| can?(action, video) }
-    end
 end

app/components/admin/poll/questions/table_actions_component.html.erb

@@ -1,3 +1,3 @@
-<%= render Admin::TableActionsComponent.new(question, actions: actions) do |table_actions| %>
-  <%= table_actions.action(:answers, text: t("admin.polls.show.edit_answers")) %>
+<%= render Admin::AllowedTableActionsComponent.new(question) do |actions| %>
+  <%= actions.action(:answers, text: t("admin.polls.show.edit_answers")) %>
 <% end %>

app/components/admin/poll/questions/table_actions_component.rb

@@ -1,14 +1,7 @@
 class Admin::Poll::Questions::TableActionsComponent < ApplicationComponent
   attr_reader :question
-  delegate :can?, to: :helpers
 
   def initialize(question)
     @question = question
   end
-
-  private
-
-    def actions
-      [:edit, :destroy].select { |action| can?(action, question) }
-    end
 end

spec/components/admin/allowed_table_actions_component_spec.rb

@@ -0,0 +1,57 @@
+require "rails_helper"
+
+describe Admin::AllowedTableActionsComponent, controller: Admin::BaseController do
+  before do
+    sign_in(create(:administrator).user)
+    allow_any_instance_of(Admin::AllowedTableActionsComponent).to receive(:can?).and_return true
+  end
+  let(:record) { create(:banner, title: "Important!") }
+
+  it "renders edit and destroy actions by default if they're allowed" do
+    component = Admin::AllowedTableActionsComponent.new(record)
+
+    render_inline component
+
+    expect(page).to have_link count: 1
+    expect(page).to have_link "Edit"
+    expect(page).to have_button count: 1
+    expect(page).to have_button "Delete"
+  end
+
+  it "accepts an actions parameter" do
+    render_inline Admin::AllowedTableActionsComponent.new(record, actions: [:edit])
+
+    expect(page).to have_link "Edit"
+    expect(page).not_to have_button "Delete"
+  end
+
+  it "accepts custom options" do
+    render_inline Admin::AllowedTableActionsComponent.new(record, edit_text: "change", edit_path: "/myedit")
+
+    expect(page).to have_link "change", href: "/myedit"
+  end
+
+  it "accepts custom content" do
+    render_inline Admin::AllowedTableActionsComponent.new(record) do
+      "<a href='/'>Main</a>".html_safe
+    end
+
+    expect(page).to have_link count: 2
+    expect(page).to have_link "Main", href: "/"
+    expect(page).to have_link "Edit"
+
+    expect(page).to have_button count: 1
+    expect(page).to have_button "Delete"
+  end
+
+  it "only renders the allowed actions" do
+    component = Admin::AllowedTableActionsComponent.new(record)
+    allow(component).to receive(:can?).with(:edit, record).and_return true
+    allow(component).to receive(:can?).with(:destroy, record).and_return false
+
+    render_inline component
+
+    expect(page).to have_link "Edit"
+    expect(page).not_to have_button "Delete"
+  end
+end