refactor: DRY session name filter logic

app/helpers/filters_helper.rb

@@ -2,7 +2,7 @@ module FiltersHelper
   def filter_selected?(filter, value, filter_type)
     return false unless session["#{filter_type}_filters"]
 
-    selected_filters = JSON.parse(session["#{filter_type}_filters"])
+    selected_filters = JSON.parse(session[session_name_for(filter_type)])
     return true if selected_filters.blank? && filter == "user" && value == :all
     return true if !selected_filters.key?("organisation") && filter == "organisation_select" && value == :all
     return true if selected_filters["organisation"].present? && filter == "organisation_select" && value == :specific_org
@@ -22,7 +22,7 @@ module FiltersHelper
   def selected_option(filter, filter_type)
     return false unless session["#{filter_type}_filters"]
 
-    JSON.parse(session["#{filter_type}_filters"])[filter] || ""
+    JSON.parse(session[[session_name_for(filter_type)]])[filter] || ""
   end
 
   def organisations_filter_options(user)
@@ -33,4 +33,10 @@ module FiltersHelper
   def collection_year_options
     { "2023": "2023/24", "2022": "2022/23", "2021": "2021/22" }
   end
+
+private
+
+  def session_name_for(filter_type)
+    "#{filter_type}_filters"
+  end
 end

app/services/filter_manager.rb

@@ -38,7 +38,7 @@ class FilterManager
   end
 
   def serialize_filters_to_session(specific_org: false)
-    session["#{@filter_type}_filters"] = session_filters(specific_org:).to_json
+    session[session_name_for(filter_type)] = session_filters(specific_org:).to_json
   end
 
   def session_filters(specific_org: false)
@@ -46,7 +46,7 @@ class FilterManager
   end
 
   def deserialize_filters_from_session(specific_org)
-    current_filters = session["#{@filter_type}_filters"]
+    current_filters = session[session_name_for(filter_type)]
     new_filters = current_filters.present? ? JSON.parse(current_filters) : {}
     if @filter_type.include?("logs")
       current_user.logs_filters(specific_org:).each do |filter|
@@ -69,6 +69,10 @@ class FilterManager
 private
 
   def logs_filters
-    JSON.parse(session["#{@filter_type}_filters"] || "{}") || {}
+    JSON.parse(session[session_name_for(filter_type)] || "{}") || {}
+  end
+
+  def session_name_for(filter_type)
+    "#{filter_type}_filters"
   end
 end