Move content blocks forms partials to components

This way we can simplify the controller a little bit, and it'll be
easier to write tests for them when we change the code.

app/components/admin/site_customization/content_blocks/form_content_block_component.html.erb

@@ -1,9 +1,9 @@
-<%= form_for [:admin, @content_block], html: { class: "edit_page" } do |f| %>
+<%= form_for [:admin, content_block], html: { class: "edit_page" } do |f| %>
 
-  <%= render "shared/errors", resource: @content_block %>
+  <%= render "shared/errors", resource: content_block %>
 
   <div class="small-12 medium-6 column">
-    <%= f.select :name, options_for_select(valid_blocks, @selected_content_block) %>
+    <%= f.select :name, options_for_select(valid_blocks, selected_content_block) %>
   </div>
   <div class="small-12 medium-6 column">
     <%= f.select :locale, I18n.available_locales %>

app/components/admin/site_customization/content_blocks/form_content_block_component.rb

@@ -0,0 +1,14 @@
+class Admin::SiteCustomization::ContentBlocks::FormContentBlockComponent < ApplicationComponent
+  attr_reader :content_block
+  use_helpers :valid_blocks
+
+  def initialize(content_block)
+    @content_block = content_block
+  end
+
+  private
+
+    def selected_content_block
+      content_block.name
+    end
+end

app/components/admin/site_customization/content_blocks/form_heading_content_block_component.html.erb

@@ -1,17 +1,17 @@
-<%= form_tag(admin_site_customization_update_heading_content_block_path(@content_block.id), method: "put") do %>
+<%= form_tag(admin_site_customization_update_heading_content_block_path(content_block.id), method: "put") do %>
-  <%= render "shared/errors", resource: @content_block %>
+  <%= render "shared/errors", resource: content_block %>
 
   <div class="small-12 medium-6 column">
     <%= label_tag :name %>
-    <%= select_tag :name, options_for_select(valid_blocks, @selected_content_block) %>
+    <%= select_tag :name, options_for_select(valid_blocks, selected_content_block) %>
   </div>
   <div class="small-12 medium-6 column">
     <%= label_tag :locale %>
-    <%= select_tag :locale, options_for_select(I18n.available_locales, @content_block.locale.to_sym) %>
+    <%= select_tag :locale, options_for_select(I18n.available_locales, content_block.locale.to_sym) %>
   </div>
   <div class="small-12 column">
     <%= label_tag :body %>
-    <%= text_area_tag :body, @content_block.body, rows: 10 %>
+    <%= text_area_tag :body, content_block.body, rows: 10 %>
     <div class="small-12 medium-6 large-3">
       <%= button_tag t("admin.menu.site_customization.buttons.content_block.update"), class: "button success expanded" %>
     </div>

app/components/admin/site_customization/content_blocks/form_heading_content_block_component.rb

@@ -0,0 +1,14 @@
+class Admin::SiteCustomization::ContentBlocks::FormHeadingContentBlockComponent < ApplicationComponent
+  attr_reader :content_block
+  use_helpers :valid_blocks
+
+  def initialize(content_block)
+    @content_block = content_block
+  end
+
+  private
+
+    def selected_content_block
+      "hcb_#{content_block.heading_id}"
+    end
+end

app/controllers/admin/site_customization/content_blocks_controller.rb

@@ -34,7 +34,6 @@ class Admin::SiteCustomization::ContentBlocksController < Admin::SiteCustomizati
   end
 
   def edit
-    @selected_content_block = @content_block.name
   end
 
   def update
@@ -71,7 +70,6 @@ class Admin::SiteCustomization::ContentBlocksController < Admin::SiteCustomizati
 
   def edit_heading_content_block
     @content_block = Budget::ContentBlock.find(params[:id])
-    @selected_content_block = "hcb_#{@content_block.heading_id}"
     @is_heading_content_block = true
     render :edit
   end

app/views/admin/site_customization/content_blocks/_form.html.erb

@@ -1,5 +1,5 @@
 <% if @is_heading_content_block %>
-  <%= render "form_heading_content_block" %>
+  <%= render Admin::SiteCustomization::ContentBlocks::FormHeadingContentBlockComponent.new(@content_block) %>
 <% else %>
-  <%= render "form_content_block" %>
+  <%= render Admin::SiteCustomization::ContentBlocks::FormContentBlockComponent.new(@content_block) %>
 <% end %>