Abstracting Pages to Containers

[idlefingers]

This is a fairly big rewrite, changing the models to be more generic, so we can now use a Container to refer to a Page or Layout. A page belongs to a layout, and a layout has many pages (using STI on containers). When fetching a page, the layout is included in the container. When fetching a layout, you just get the layout.

The resulting json from a page fetch is something like this:

{
  "container": {
    "id": 1,
    "name": "Home",
    "url": "/",
    "revisionId": 1,
    "type": "Ninetails::Page",
    "layout": {
      "container": {
        "name": "GB Layout",
        "revisionId": 2,
        "type": "Ninetails::Layout",
        "sections": [
          {
            "id": 1,
            "type": "Header",
            "elements": {
              "menuItems": [
                {
                  "type": "Button",
                  "reference": "c9dc3fcc-617a-49ef-ae47-032eb43c0422",
                  "link": {
                    "reference": "aaef6097-0f13-4512-b48c-f4dad1b8dc16",
                    "pageId": "1",
                    "title": "",
                    "text": "Service"
                  }
                }
              ]
            }
          },
          {
            "id": 2,
            "name": "",
            "type": "Page",
            "locationName": "body"
          },
          {
            "type": "Footer",
            "elements": {
              "disclaimer": {
                "type": "Text",
                "reference": "c9dc3fcc-617a-49ef-ae47-032ee43c0422",
                "content": {
                  "reference": "ad83809e-2fae-4b0c-95a3-eebfeeeef6ba",
                  "text": "iZettle is an E-money Institution and is under the supervision of the Swedish Financial Supervisory Authority."
                }
              }
            }
          }
        ]
      }
    },
    "sections": [
      {
        "type": "Billboard",
        "locatedIn": "body",
        "elements": {
          "title": {
            "type": "Text",
            "reference": "4be267d2-c02f-4191-9a95-43e1a4b08ce3",
            "content": {
              "reference": "ad83ee9e-2fae-4b0c-a5a3-eebf123ef6ba",
              "text": "Grow your business with iZettle"
            }
          },
          "backgroundImage": {
            "type": "BackgroundImage",
            "reference": "ec1a9292-d7f5-497c-8f55-3a36ee08ddfd",
            "image": {
              "reference": "aaef6097-0f73-4512-b48c-f4d0dbb8dc56",
              "src": "https://cdn.izettle.com/billboards/start/v4/en_GB.jpg",
              "alt": "Billboard image"
            }
          },
          "signupButton": {
            "type": "Button",
            "reference": "1e01ee34-8d2a-4db9-8e4c-124f38aa591c",
            "link": {
              "reference": "aaef60f7-0f73-4512-b48c-f4dadbb8dc56",
              "pageId": "2",
              "title": "Sign up now!",
              "text": "Get a free card reader!"
            }
          }
        }
      }
    ]
  }
}

@marreman thoughts?