Add doi specs

Author: wendelfabianchinsamy

app/models/concerns/event_index_handler.rb

@@ -146,8 +146,6 @@ def cache_key
   end
 
   def date_published(doi)
-    item = Doi.find_by(doi: DoiUtilities.uppercase_doi_from_url(doi))
-
-    item[:publication_date] if item.present?
+    Doi.publication_date(doi)
   end
 end

app/models/doi.rb

@@ -1,10 +1,16 @@
 # frozen_string_literal: true
 
-class Doi < ApplicationRecord
-  # Map the doi model to the dataset table in the datacite mysql database
-  self.table_name = "dataset"
+class Doi
+  class << self
+    def publication_date(doi)
+      search_doi = DoiUtilities.uppercase_doi_from_url(doi)
 
-  # Attributes
-  attribute :doi, :string
-  attribute :publication_year, :integer
+      return nil if search_doi.blank?
+
+      sql = "SELECT publication_year FROM dataset WHERE doi = :doi LIMIT 1"
+      sanitized_sql = ActiveRecord::Base.send(:sanitize_sql_array, [sql, { doi: search_doi }])
+
+      ActiveRecord::Base.connection.select_one(sanitized_sql)
+    end
+  end
 end

spec/models/doi_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe(Doi, type: :model) do
+  let(:valid_doi) { "10.0000/ZENODO.00000000" }
+  let(:invalid_doi) { "invalid-doi" }
+
+  describe "#publication_date" do
+    it "returns nil when the doi is invalid" do
+      expect(described_class.publication_date(invalid_doi)).to(be_nil)
+    end
+
+    it "returns nil when no doi is found" do
+      allow(ActiveRecord::Base.connection).to(receive(:select_one).and_return(nil))
+
+      expect(described_class.publication_date(valid_doi)).to(be_nil)
+    end
+
+    it "returns the publication date(just the year) when the doi is found" do
+      allow(ActiveRecord::Base.connection).to(receive(:select_one).and_return(2025))
+
+      expect(described_class.publication_date(valid_doi)).to(eq(2025))
+    end
+  end
+end