Add option to overwrite imported data (#9962)

* Add option to overwrite imported data

Fix #7465

* Add import for domain blocks

app/models/import.rb

@@ -13,20 +13,30 @@
 #  data_file_size    :integer
 #  data_updated_at   :datetime
 #  account_id        :bigint(8)        not null
+#  overwrite         :boolean          default(FALSE), not null
 #
 
 class Import < ApplicationRecord
-  FILE_TYPES = ['text/plain', 'text/csv'].freeze
+  FILE_TYPES = %w(text/plain text/csv).freeze
+  MODES = %i(merge overwrite).freeze
 
   self.inheritance_column = false
 
   belongs_to :account
 
-  enum type: [:following, :blocking, :muting]
+  enum type: [:following, :blocking, :muting, :domain_blocking]
 
   validates :type, presence: true
 
   has_attached_file :data
   validates_attachment_content_type :data, content_type: FILE_TYPES
   validates_attachment_presence :data
+
+  def mode
+    overwrite? ? :overwrite : :merge
+  end
+
+  def mode=(str)
+    self.overwrite = str.to_sym == :overwrite
+  end
 end