Improve spec coverage and clean up api/v1/blocks controller (#3464)

app/controllers/api/v1/blocks_controller.rb

@@ -3,24 +3,60 @@
 class Api::V1::BlocksController < ApiController
   before_action -> { doorkeeper_authorize! :follow }
   before_action :require_user!
+  after_action :insert_pagination_headers
 
   respond_to :json
 
   def index
-    @accounts = Account.includes(:blocked_by)
-                       .references(:blocked_by)
-                       .merge(Block.where(account: current_account)
-                                   .paginate_by_max_id(limit_param(DEFAULT_ACCOUNTS_LIMIT), params[:max_id], params[:since_id]))
-                       .to_a
-
-    next_path = api_v1_blocks_url(pagination_params(max_id: @accounts.last.blocked_by_ids.last))     if @accounts.size == limit_param(DEFAULT_ACCOUNTS_LIMIT)
-    prev_path = api_v1_blocks_url(pagination_params(since_id: @accounts.first.blocked_by_ids.first)) unless @accounts.empty?
-
-    set_pagination_headers(next_path, prev_path)
+    @accounts = load_accounts
   end
 
   private
 
+  def load_accounts
+    default_accounts.merge(paginated_blocks).to_a
+  end
+
+  def default_accounts
+    Account.includes(:blocked_by).references(:blocked_by)
+  end
+
+  def paginated_blocks
+    Block.where(account: current_account).paginate_by_max_id(
+      limit_param(DEFAULT_ACCOUNTS_LIMIT),
+      params[:max_id],
+      params[:since_id]
+    )
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    if records_continue?
+      api_v1_blocks_url pagination_params(max_id: pagination_max_id)
+    end
+  end
+
+  def prev_path
+    unless @accounts.empty?
+      api_v1_blocks_url pagination_params(since_id: pagination_since_id)
+    end
+  end
+
+  def pagination_max_id
+    @accounts.last.blocked_by_ids.last
+  end
+
+  def pagination_since_id
+    @accounts.first.blocked_by_ids.first
+  end
+
+  def records_continue?
+    @accounts.size == limit_param(DEFAULT_ACCOUNTS_LIMIT)
+  end
+
   def pagination_params(core_params)
     params.permit(:limit).merge(core_params)
   end