collaborations
collaborations: object[] = [{id: 123,user_name: "John Doe",user_email: "mail@example.com",user_photo_url: "https://placekitten.com/100/100",accepted: true,access_level: "read-write",created_at: "2015-01-01",updated_at: "2015-01-01",trip_id: '123456'}, {id: 981,user_name: "John Moe",user_email: "mail@example.com",user_photo_url: "https://placekitten.com/100/100",accepted: true,access_level: "read-only",created_at: "2015-01-01",updated_at: "2015-01-01",trip_id: '123456'}]