Make dashboard pagination default "per" param configurable (#597)

* Make dashboard pagination default "per" param configurable

Author: alopatin

lib/split/configuration.rb

@@ -25,6 +25,7 @@ class Configuration
     attr_accessor :beta_probability_simulations
     attr_accessor :winning_alternative_recalculation_interval
     attr_accessor :redis
+    attr_accessor :dashboard_pagination_default_per_page
 
     attr_reader :experiments
 
@@ -226,6 +227,7 @@ def initialize
       @beta_probability_simulations = 10000
       @winning_alternative_recalculation_interval = 60 * 60 * 24 # 1 day
       @redis = ENV.fetch(ENV.fetch('REDIS_PROVIDER', 'REDIS_URL'), 'redis://localhost:6379')
+      @dashboard_pagination_default_per_page = 10
     end
 
     def redis_url=(value)

lib/split/dashboard/pagination_helpers.rb

@@ -3,10 +3,9 @@
 
 module Split
   module DashboardPaginationHelpers
-    DEFAULT_PER = 10
-
     def pagination_per
-      @pagination_per ||= (params[:per] || DEFAULT_PER).to_i
+      default_per_page = Split.configuration.dashboard_pagination_default_per_page
+      @pagination_per ||= (params[:per] || default_per_page).to_i
     end
 
     def page_number

spec/dashboard/pagination_helpers_spec.rb

@@ -10,7 +10,9 @@
     context 'when params empty' do
       let(:params) { Hash[] }
 
-      it 'returns 10' do
+      it 'returns the default (10)' do
+        default_per_page = Split.configuration.dashboard_pagination_default_per_page
+        expect(pagination_per).to eql default_per_page
         expect(pagination_per).to eql 10
       end
     end