Initial commit

app/models/concerns/signable.rb

@@ -0,0 +1,30 @@
+module Signable
+  extend ActiveSupport::Concern
+
+  included do
+    include ActiveStorageSupport::SupportForBase64
+
+    has_one_base64_attached :signature
+
+    scope :having_a_signature,  -> { left_joins(:signature_attachment).group(:id).having("COUNT(active_storage_attachments) > 0") }
+    scope :having_no_signature, -> { left_joins(:signature_attachment).group(:id).having("COUNT(active_storage_attachments) = 0") }
+
+    # Create some descriptive aliases for scopes above relating to native vs. non-native
+    scope :native,      -> { having_a_signature }
+    scope :non_native,  -> { having_no_signature }
+  end
+
+  def native?
+    signature.attached?
+  end
+
+  def signature_base64
+    return nil
+  end
+
+  def signature_base64=(data_uri)
+    return if data_uri.blank?
+
+    signature.attach(data: data_uri, filename: "signature.png", content_type: "image/png", identify: "false")
+  end
+end