diff --git a/app/models/doi.rb b/app/models/doi.rb
index 53c358d00..6e8988335 100644
--- a/app/models/doi.rb
+++ b/app/models/doi.rb
@@ -83,7 +83,10 @@ class Doi < ActiveRecord::Base
   validates_uniqueness_of :doi, message: "This DOI has already been taken", unless: :only_validate
   validates :last_landing_page_status, numericality: { only_integer: true }, if: :last_landing_page_status?
   validates :xml, presence: true, xml_schema: true, if: Proc.new { |doi| doi.validatable? }
-  # validate :check_dates, if: :dates?
+  validate :check_dates, if: :dates?
+  validate :check_rights_list, if: :rights_list?
+  validate :check_descriptions, if: :descriptions?
+  validate :check_subjects, if: :subjects?
 
   after_commit :update_url, on: [:create, :update]
   after_commit :update_media, on: [:create, :update]
@@ -771,7 +774,26 @@ def event=(value)
 
   def check_dates
     Array.wrap(dates).each do |d|
-      errors.add(:dates, "Date #{d["date"]} is not a valid date in ISO8601 format.") unless Date.edtf(d["date"]).present?
+      errors.add(:dates, "Date #{d} should be an object instead of a string.") unless d.is_a?(Hash)
+      #errors.add(:dates, "Date #{d["date"]} is not a valid date in ISO8601 format.") unless Date.edtf(d["date"]).present?
+    end
+  end
+
+  def check_rights_list
+    Array.wrap(rights_list).each do |r|
+      errors.add(:rights_list, "Rights '#{r}' should be an object instead of a string.") unless r.is_a?(Hash)
+    end
+  end
+
+  def check_descriptions
+    Array.wrap(descriptions).each do |d|
+      errors.add(:descriptions, "Description '#{d}' should be an object instead of a string.") unless d.is_a?(Hash)
+    end
+  end
+
+  def check_subjects
+    Array.wrap(subjects).each do |s|
+      errors.add(:subjects, "Subject '#{s}' should be an object instead of a string.") unless s.is_a?(Hash)
     end
   end
 
diff --git a/spec/models/doi_spec.rb b/spec/models/doi_spec.rb
index d96f872f9..6c1a0ed6c 100644
--- a/spec/models/doi_spec.rb
+++ b/spec/models/doi_spec.rb
@@ -216,6 +216,54 @@
     # end
   end
 
+  describe "descriptions" do
+    let(:doi) { build(:doi) }
+
+    it "hash" do
+      doi.descriptions = [{ "description" => "This is a description." }]
+      expect(doi.save).to be true
+      expect(doi.errors.details).to be_empty
+    end
+
+    it "string" do
+      doi.descriptions = ["This is a description."]
+      expect(doi.save).to be false
+      expect(doi.errors.details).to eq(:descriptions=>[{:error=>"Description 'This is a description.' should be an object instead of a string."}])
+    end
+  end
+
+  describe "rights_list" do
+    let(:doi) { build(:doi) }
+
+    it "hash" do
+      doi.rights_list = [{ "rights" => "Creative Commons Attribution 4.0 International license (CC BY 4.0)" }]
+      expect(doi.save).to be true
+      expect(doi.errors.details).to be_empty
+    end
+
+    it "string" do
+      doi.rights_list = ["Creative Commons Attribution 4.0 International license (CC BY 4.0)"]
+      expect(doi.save).to be false
+      expect(doi.errors.details).to eq(:rights_list => [{:error=>"Rights 'Creative Commons Attribution 4.0 International license (CC BY 4.0)' should be an object instead of a string."}])
+    end
+  end
+
+  describe "subjects" do
+    let(:doi) { build(:doi) }
+
+    it "hash" do
+      doi.subjects = [{ "subject" => "Tree" }]
+      expect(doi.save).to be true
+      expect(doi.errors.details).to be_empty
+    end
+
+    it "string" do
+      doi.subjects = ["Tree"]
+      expect(doi.save).to be false
+      expect(doi.errors.details).to eq(:subjects=>[{:error=>"Subject 'Tree' should be an object instead of a string."}])
+    end
+  end
+
   describe "dates" do
     let(:doi) { build(:doi) }
 
@@ -255,6 +303,12 @@
       expect(doi.errors.details).to be_empty
     end
 
+    it "string" do
+      doi.dates = ["2019-08-01"]
+      expect(doi.save).to be false
+      expect(doi.errors.details).to eq(:dates=>[{:error=>"Date 2019-08-01 should be an object instead of a string."}])
+    end
+
     # it "invalid" do
     #   doi.dates = [{ "date" => "08/01/2019" }]
     #   expect(doi.save).to be false