feat: first pass at bulk upload duplicate log detection

app/services/bulk_upload/lettings/validator.rb

@@ -176,6 +176,7 @@ class BulkUpload::Lettings::Validator
   def create_logs?
     return false if any_setup_sections_incomplete?
     return false if over_column_error_threshold?
+    return false if duplicate_log_already_exists?
 
     row_parsers.all? { |row_parser| row_parser.log.valid? }
   end
@@ -203,6 +204,17 @@ private
     end
   end
 
+  def duplicate_log_already_exists?
+    fields = ["lettype"]
+
+    fields.any? do |field|
+      # binding.pry
+      count = row_parsers.count { |row_parser| LettingsLog.where("lettype": 7).present? }
+
+      count > 0
+    end
+  end
+
   def csv_parser
     @csv_parser ||= BulkUpload::Lettings::CsvParser.new(path:)
   end

spec/services/bulk_upload/lettings/validator_spec.rb

@@ -255,5 +255,19 @@ RSpec.describe BulkUpload::Lettings::Validator do
         end
       end
     end
+
+    context "when the file contains a log which already exists in the db" do
+      let(:log_1) { create(:lettings_log, :completed, lettype: 7, created_by: user) }
+
+      before do
+        file.write(BulkUpload::LogToCsv.new(log: log_1, line_ending: "\r\n", col_offset: 0).to_csv_row)
+        file.close
+      end
+
+      it "returns true" do
+        validator.call
+        expect(validator).not_to be_create_logs
+      end
+    end
   end
 end