Add JSON endpoint for CitationsController#index

app/controllers/citations_controller.rb

@@ -6,10 +6,17 @@ class CitationsController < ApplicationController
   before_action :load_resource_and_authorise, except: :index
   before_action :set_in_pro_area, except: :index
 
+  skip_before_action :html_response, only: :index
+
   def index
     per_page = 10
     page = get_search_page_from_params
     @citations = Citation.not_embargoed.paginate(page: page, per_page: per_page)
+
+    respond_to do |format|
+      format.html { @has_json = true }
+      format.json { render json: @citations }
+    end
   end
 
   def new

app/models/citation.rb

@@ -17,6 +17,9 @@
 # A Citation of an InfoRequest or InfoRequestBatch
 #
 class Citation < ApplicationRecord
+  include Rails.application.routes.url_helpers
+  include LinkToHelper
+
   self.inheritance_column = nil
 
   belongs_to :user, inverse_of: :citations
@@ -61,4 +64,17 @@ class Citation < ApplicationRecord
   def applies_to_batch_request?
     citable.is_a?(InfoRequestBatch)
   end
+
+  def as_json(_options)
+    citable_path = case citable
+                   when InfoRequest
+                     request_path(citable)
+                   when InfoRequestBatch
+                     info_request_batch_path(citable)
+                   end
+
+    attributes.
+      except('user_id', 'citable_id', 'citable_type').
+      merge(citable_path: citable_path)
+  end
 end