Move setting of parent to issuable finder

- use before_all in spec

app/finders/issuable_finder.rb

@@ -204,8 +204,30 @@ class IssuableFinder
     end
   end
 
+  def parent=(obj)
+    @parent = obj
+  end
+
+  def parent_param=(obj)
+    @parent = obj
+    params[parent_param] = parent if parent
+  end
+
+  def parent_param
+    case parent
+    when Project
+      :project_id
+    when Group
+      :group_id
+    else
+      raise "Unexpected parent: #{parent.class}"
+    end
+  end
+
   private
 
+  attr_reader :parent
+
   def not_params
     strong_memoize(:not_params) do
       params_class.new(params[:not].dup, current_user, klass).tap do |not_params|

app/graphql/resolvers/issue_status_counts_resolver.rb

@@ -7,21 +7,8 @@ module Resolvers
     type Types::IssueStatusCountsType, null: true
 
     def continue_issue_resolve(parent, finder, **args)
-      finder.params[parent_param(parent)] = parent if parent
+      finder.parent_param = parent
       apply_lookahead(Gitlab::IssuablesCountForState.new(finder, parent))
     end
-
-    private
-
-    def parent_param(parent)
-      case parent
-      when Project
-        :project_id
-      when Group
-        :group_id
-      else
-        raise "Unexpected type of parent: #{parent.class}. Must be Project or Group"
-      end
-    end
   end
 end

lib/gitlab/graphql/loaders/issuable_loader.rb

@@ -15,6 +15,7 @@ module Gitlab
 
         def batching_find_all(&with_query)
           if issuable_finder.params.keys == ['iids']
+            issuable_finder.parent = parent
             batch_load_issuables(issuable_finder.params[:iids], with_query)
           else
             post_process(find_all, with_query)
@@ -22,24 +23,12 @@ module Gitlab
         end
 
         def find_all
-          issuable_finder.params[parent_param] = parent if parent
-
+          issuable_finder.parent_param = parent if parent
           issuable_finder.execute
         end
 
         private
 
-        def parent_param
-          case parent
-          when Project
-            :project_id
-          when Group
-            :group_id
-          else
-            raise "Unexpected parent: #{parent.class}"
-          end
-        end
-
         def post_process(query, with_query)
           if with_query
             with_query.call(query)
@@ -56,7 +45,7 @@ module Gitlab
           return if parent.nil?
 
           BatchLoader::GraphQL
-            .for([parent_param, iid.to_s])
+            .for([issuable_finder.parent_param, iid.to_s])
             .batch(key: batch_key) do |params, loader, args|
               batch_key = args[:key]
               user = batch_key.current_user