Add offset pagination to trends in REST API (#17872)

1 files changed, 25 insertions, 1 deletions

diff --git a/app/controllers/api/v1/trends/links_controller.rb b/app/controllers/api/v1/trends/links_controller.rb
index ad20e7f8b..b1cde5a4b 100644
--- a/app/controllers/api/v1/trends/links_controller.rb
+++ b/app/controllers/api/v1/trends/links_controller.rb
@@ -3,6 +3,10 @@
 class Api::V1::Trends::LinksController < Api::BaseController
   before_action :set_links
 
+  after_action :insert_pagination_headers
+
+  DEFAULT_LINKS_LIMIT = 10
+
   def index
     render json: @links, each_serializer: REST::Trends::LinkSerializer
   end
@@ -20,6 +24,26 @@ class Api::V1::Trends::LinksController < Api::BaseController
   end
 
   def links_from_trends
-    Trends.links.query.allowed.in_locale(content_locale).limit(limit_param(10))
+    Trends.links.query.allowed.in_locale(content_locale).offset(offset_param).limit(limit_param(DEFAULT_LINKS_LIMIT))
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def pagination_params(core_params)
+    params.slice(:limit).permit(:limit).merge(core_params)
+  end
+
+  def next_path
+    api_v1_trends_links_url pagination_params(offset: offset_param + limit_param(DEFAULT_LINKS_LIMIT))
+  end
+
+  def prev_path
+    api_v1_trends_links_url pagination_params(offset: offset_param - limit_param(DEFAULT_LINKS_LIMIT)) if offset_param > limit_param(DEFAULT_LINKS_LIMIT)
+  end
+
+  def offset_param
+    params[:offset].to_i
   end
 end