old_contents: App.Investigation = DS.Model.extend({
    name: DS.attr('string', {defaultValue: 'New investigation'}),
    queryDefinition: DS.attr('string'),
    xAxisLabel: DS.attr('string'),
    yAxisLabel: DS.attr('string'),
    project: DS.belongsTo('project')
  });
new_contents: App.Investigation = DS.Model.extend({
    name: DS.attr('string', {defaultValue: 'New investigation'}),
    queryDefinition: DS.attr('string'),
    xAxisLabel: DS.attr('string'),
    yAxisLabel: DS.attr('string'),
    organization: DS.attr('string'),
    product: DS.attr('string'),
    project: DS.belongsTo('project')
  });
subject: Add new fields to investigation