Initial commit

app/models/concerns/data_is_json_validator.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Data json validation
+class DataIsJsonValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, data)
+    return if data.nil?
+
+    unless validate_data_is_json!(data)
+      record.errors.add(attribute, :invalid_format, message: 'data is not json compatible string')
+    end
+  end
+
+  def validate_data_is_json!(data)
+    begin
+      JSON.parse(data)
+      true
+    rescue JSON::ParserError => e
+      false
+    end
+  end
+end