diff --git a/app/models/queries/work_packages/selects/custom_field_select.rb b/app/models/queries/work_packages/selects/custom_field_select.rb
index c6e2a107d5da..21a0f0c730bb 100644
--- a/app/models/queries/work_packages/selects/custom_field_select.rb
+++ b/app/models/queries/work_packages/selects/custom_field_select.rb
@@ -69,20 +69,19 @@ def self.instances(context = nil)
   private
 
   def set_name!
-    self.name = custom_field.column_name.to_sym
+    @name = custom_field.column_name.to_sym
   end
 
   def set_sortable!
-    self.sortable = custom_field.order_statements || false
+    @sortable = custom_field.order_statements || false
   end
 
   def set_groupable!
-    self.groupable = custom_field.group_by_statement if groupable_custom_field?(custom_field)
-    self.groupable ||= false
+    @groupable = groupable_custom_field?(custom_field) ? custom_field.group_by_statement || false : false
   end
 
   def set_summable!
-    self.summable = if %w(float int).include?(custom_field.field_format)
+    @summable = if %w(float int).include?(custom_field.field_format)
                       select = summable_select_statement
 
                       ->(query, grouped) {
diff --git a/app/models/queries/work_packages/selects/relation_of_type_select.rb b/app/models/queries/work_packages/selects/relation_of_type_select.rb
index eb6809cec69c..46cd6780a501 100644
--- a/app/models/queries/work_packages/selects/relation_of_type_select.rb
+++ b/app/models/queries/work_packages/selects/relation_of_type_select.rb
@@ -28,7 +28,8 @@
 
 class Queries::WorkPackages::Selects::RelationOfTypeSelect < Queries::WorkPackages::Selects::RelationSelect
   def initialize(type)
-    self.type = type
+    @type = type
+
     super(name)
   end
 
diff --git a/app/models/queries/work_packages/selects/relation_select.rb b/app/models/queries/work_packages/selects/relation_select.rb
index c12f7663eb2e..224b1e58f743 100644
--- a/app/models/queries/work_packages/selects/relation_select.rb
+++ b/app/models/queries/work_packages/selects/relation_select.rb
@@ -27,7 +27,7 @@
 #++
 
 class Queries::WorkPackages::Selects::RelationSelect < Queries::WorkPackages::Selects::WorkPackageSelect
-  attr_accessor :type
+  attr_reader :type
 
   def self.granted_by_enterprise_token
     EnterpriseToken.allows_to?(:work_package_query_relation_columns)
diff --git a/app/models/queries/work_packages/selects/relation_to_type_select.rb b/app/models/queries/work_packages/selects/relation_to_type_select.rb
index cd6ddcd432fc..adf9b685d104 100644
--- a/app/models/queries/work_packages/selects/relation_to_type_select.rb
+++ b/app/models/queries/work_packages/selects/relation_to_type_select.rb
@@ -31,11 +31,11 @@ def initialize(type)
     super
 
     set_name! type
-    self.type = type
+    @type = type
   end
 
   def set_name!(type)
-    self.name = :"relations_to_type_#{type.id}"
+    @name = :"relations_to_type_#{type.id}"
   end
 
   def caption
diff --git a/app/models/queries/work_packages/selects/work_package_select.rb b/app/models/queries/work_packages/selects/work_package_select.rb
index a3ffe42aa3b6..af559df44bd1 100644
--- a/app/models/queries/work_packages/selects/work_package_select.rb
+++ b/app/models/queries/work_packages/selects/work_package_select.rb
@@ -27,19 +27,13 @@
 #++
 
 class Queries::WorkPackages::Selects::WorkPackageSelect
-  attr_accessor :highlightable,
-                :name,
-                :sortable_join,
-                :summable,
-                :default_order,
-                :association
-  alias_method :highlightable?, :highlightable
-
-  attr_reader :groupable,
-              :sortable,
-              :displayable
-
-  attr_writer :null_handling,
+  attr_reader :highlightable,
+              :name,
+              :sortable_join,
+              :summable,
+              :default_order,
+              :association,
+              :null_handling,
               :summable_select,
               :summable_work_packages_select
 
@@ -76,31 +70,25 @@ def null_handling(_asc)
     @null_handling
   end
 
-  def groupable=(value)
-    @groupable = name_or_value_or_false(value)
+  def displayable
+    @displayable.nil? ? true : @displayable
   end
 
-  def sortable=(value)
-    @sortable = name_or_value_or_false(value)
+  def sortable
+    name_or_value_or_false(@sortable)
   end
 
-  def displayable=(value)
-    @displayable = value.nil? ? true : value
+  def groupable
+    name_or_value_or_false(@groupable)
   end
 
-  def displayable?
-    displayable
-  end
+  def displayable? = !!displayable
 
-  # Returns true if the column is sortable, otherwise false
-  def sortable?
-    !!sortable
-  end
+  def sortable? = !!sortable
 
-  # Returns true if the column is groupable, otherwise false
-  def groupable?
-    !!groupable
-  end
+  def groupable? = !!groupable
+
+  def highlightable? = !!highlightable
 
   def summable?
     summable || @summable_select || @summable_work_packages_select
@@ -127,22 +115,24 @@ def value(model)
   end
 
   def initialize(name, options = {})
-    self.name = name
-
-    %i(sortable
-       sortable_join
-       displayable
-       groupable
-       summable
-       summable_select
-       summable_work_packages_select
-       association
-       null_handling
-       default_order).each do |attribute|
-      send(:"#{attribute}=", options[attribute])
+    @name = name
+
+    %i[
+      sortable
+      sortable_join
+      displayable
+      groupable
+      summable
+      summable_select
+      summable_work_packages_select
+      association
+      null_handling
+      default_order
+    ].each do |attribute|
+      instance_variable_set(:"@#{attribute}", options[attribute])
     end
 
-    self.highlightable = !!options.fetch(:highlightable, false)
+    @highlightable = !!options.fetch(:highlightable, false)
   end
 
   def caption
diff --git a/spec/models/queries/work_packages/selects/shared_query_select_specs.rb b/spec/models/queries/work_packages/selects/shared_query_select_specs.rb
index 4fd9758d4c28..645352fd91c6 100644
--- a/spec/models/queries/work_packages/selects/shared_query_select_specs.rb
+++ b/spec/models/queries/work_packages/selects/shared_query_select_specs.rb
@@ -29,52 +29,60 @@
 RSpec.shared_examples_for "query column" do |sortable_by_default: false|
   describe "#groupable" do
     it "is the name if true is provided" do
-      instance.groupable = true
+      instance.instance_variable_set(:@groupable, true)
 
       expect(instance.groupable).to eql(instance.name.to_s)
     end
 
     it "is the value if something truthy is provided" do
-      instance.groupable = "lorem ipsum"
+      instance.instance_variable_set(:@groupable, "lorem ipsum")
 
       expect(instance.groupable).to eql("lorem ipsum")
     end
 
     it "is false if false is provided" do
-      instance.groupable = false
+      instance.instance_variable_set(:@groupable, false)
 
       expect(instance.groupable).to be_falsey
     end
 
-    it "is false if nothing is provided" do
-      instance.groupable = nil
+    it "is false if nil is provided" do
+      instance.instance_variable_set(:@groupable, nil)
 
       expect(instance.groupable).to be_falsey
     end
+
+    it "is false if not set" do
+      expect(instance.groupable).to be_falsey
+    end
   end
 
   describe "#sortable" do
     it "is the name if true is provided" do
-      instance.sortable = true
+      instance.instance_variable_set(:@sortable, true)
 
       expect(instance.sortable).to eql(instance.name.to_s)
     end
 
     it "is the value if something truthy is provided" do
-      instance.sortable = "lorem ipsum"
+      instance.instance_variable_set(:@sortable, "lorem ipsum")
 
       expect(instance.sortable).to eql("lorem ipsum")
     end
 
     it "is false if false is provided" do
-      instance.sortable = false
+      instance.instance_variable_set(:@sortable, false)
 
       expect(instance.sortable).to be_falsey
     end
 
-    it "is false if nothing is provided" do
-      instance.sortable = nil
+    it "is false if nil is provided" do
+      instance.instance_variable_set(:@sortable, nil)
+
+      expect(instance.sortable).to be_falsey
+    end
 
+    it "is false if not set" do
       expect(instance.sortable).to be_falsey
     end
   end
@@ -85,13 +93,13 @@
     end
 
     it "is true if told so" do
-      instance.groupable = true
+      instance.instance_variable_set(:@groupable, true)
 
       expect(instance).to be_groupable
     end
 
     it "is true if a value is provided (e.g. for specifying sql code)" do
-      instance.groupable = "COALESCE(null, 1)"
+      instance.instance_variable_set(:@groupable, "COALESCE(null, 1)")
 
       expect(instance).to be_groupable
     end
@@ -107,13 +115,13 @@
     end
 
     it "is true if told so" do
-      instance.sortable = true
+      instance.instance_variable_set(:@sortable, true)
 
       expect(instance).to be_sortable
     end
 
     it "is true if a value is provided (e.g. for specifying sql code)" do
-      instance.sortable = "COALESCE(null, 1)"
+      instance.instance_variable_set(:@sortable, "COALESCE(null, 1)")
 
       expect(instance).to be_sortable
     end