diff --git a/app/models/data_file.rb b/app/models/data_file.rb
index 72e6184129..51e7399bee 100644
--- a/app/models/data_file.rb
+++ b/app/models/data_file.rb
@@ -20,7 +20,7 @@ class DataFile < ApplicationRecord
 
   belongs_to :file_template
   has_many :extracted_samples, class_name: 'Sample', foreign_key: :originating_data_file_id
-  has_many :sample_resource_links, -> { where(resource_type: 'DataFile') }, class_name: 'SampleResourceLink', foreign_key: :resource_id
+  has_many :sample_resource_links, -> { where(resource_type: 'DataFile') }, foreign_key: :resource_id
   has_many :linked_samples, through: :sample_resource_links, source: :sample
   
   has_many :unzipped_files, class_name: 'DataFile', foreign_key: :zip_origin_id
diff --git a/app/models/sop.rb b/app/models/sop.rb
index 7e9b268605..4e6cb36b82 100644
--- a/app/models/sop.rb
+++ b/app/models/sop.rb
@@ -12,8 +12,9 @@ class Sop < ApplicationRecord
 
   #don't add a dependent=>:destroy, as the content_blob needs to remain to detect future duplicates
   has_one :content_blob, -> (r) { where('content_blobs.asset_version =? AND deleted=?', r.version, false) }, :as => :asset, :foreign_key => :asset_id
-
   has_and_belongs_to_many :workflows
+  has_many :sample_resource_links, -> { where(resource_type: 'Sop') }, foreign_key: :resource_id
+  has_many :linked_samples, through: :sample_resource_links, source: :sample
 
   has_filter assay_type: Seek::Filtering::Filter.new(
       value_field: 'assays.assay_type_uri',
@@ -50,4 +51,8 @@ def use_mime_type_for_avatar?
     true
   end
 
+  def related_samples
+    linked_samples
+  end
+
 end
diff --git a/test/unit/sop_test.rb b/test/unit/sop_test.rb
index d6cd288430..d9570ab0c3 100644
--- a/test/unit/sop_test.rb
+++ b/test/unit/sop_test.rb
@@ -343,4 +343,27 @@ def test_project_for_sop_and_sop_version_match
     refute v3.can_change_visibility?
   end
 
+  test 'related samples' do
+    project = FactoryBot.create(:project)
+
+    sample_type = FactoryBot.create(:sop_sample_type, project_ids: [project.id])
+    sop_attr = FactoryBot.build(:sop_sample_attribute, title: 'sop 2', sample_type: sample_type)
+    sample_type.sample_attributes << sop_attr
+    sop = FactoryBot.create(:sop)
+    another_sop = FactoryBot.create(:sop)
+    sop_without_samples = FactoryBot.create(:sop)
+
+    sample1 = Sample.new(sample_type: sample_type, project_ids: [project.id])
+    sample1.update(data: { 'sop': sop.id })
+    sample1.update(data: { 'sop 2': another_sop.id })
+    sample1.save!
+    sample2 = Sample.new(sample_type: sample_type, project_ids: [project.id])
+    sample2.update(data: { 'sop': another_sop.id })
+    sample2.update(data: { 'sop 2': sop.id })
+    sample2.save!
+
+    assert_empty sop_without_samples.related_samples
+    assert_equal [sample1, sample2].sort_by(&:id), sop.related_samples.sort_by(&:id)
+  end
+
 end