make use of col_sep option in import model

app/models/import.rb

@@ -89,7 +89,7 @@ def get_normalized_csv_with_validation
 
     def get_raw_csv
       return nil if raw_csv_str.nil?
-      Import::Csv.new(raw_csv_str)
+      Import::Csv.new(raw_csv_str, col_sep:)
     end
 
     def should_initialize_csv?
@@ -103,7 +103,7 @@ def initialize_csv
 
     # Uses the user-provided raw CSV + mappings to generate a normalized CSV for the import
     def generate_normalized_csv(csv_str)
-      Import::Csv.create_with_field_mappings(csv_str, expected_fields, column_mappings)
+      Import::Csv.create_with_field_mappings(csv_str, expected_fields, column_mappings, col_sep)
     end
 
     def update_csv(row_idx, col_idx, value)
@@ -177,7 +177,7 @@ def define_column_mapping_keys
 
     def raw_csv_must_be_parsable
       begin
-        CSV.parse(raw_csv_str || "")
+        CSV.parse(raw_csv_str || "", col_sep:)
       rescue CSV::MalformedCSVError
         # i18n-tasks-use t('activerecord.errors.models.import.attributes.raw_csv_str.invalid_csv_format')
         errors.add(:raw_csv_str, :invalid_csv_format)

test/models/import_test.rb

@@ -98,4 +98,18 @@ class ImportTest < ActiveSupport::TestCase
     @empty_import.reload
     assert @empty_import.failed?
   end
+
+  test "can create transactions from csv with custom column seperator" do
+    loaded_import = @empty_import.dup
+
+    loaded_import.update! raw_csv_str: valid_csv_str_with_semicolon_separator, col_sep: ";"
+    transactions = loaded_import.dry_run
+
+    assert_equal 4, transactions.count
+
+    data = transactions.first.as_json(only: [ :name, :amount, :date ])
+    assert_equal data, { "amount" => "8.55", "date" => "2024-01-01", "name" => "Starbucks drink" }
+
+    assert_equal valid_csv_str, loaded_import.normalized_csv_str
+  end
 end