contents: [
 { title: "some title", content_type: 2 },
 { title: "some title", content_type: 2 },
 { title: "some title", content_type: 1 },
 { title: "some title", content_type: 2 },
 { title: "some title", content_type: 1 },
]

contents: [
 type2: [
   { title: "some title", content_type: 2 },
   { title: "some title", content_type: 2 }
 ],
 { title: "some title", content_type: 1 },
 { title: "some title", content_type: 2 },
 { title: "some title", content_type: 1 },
]