squid-js/MIGRATION.md

# Migration Guide

Instructions on how to migrate between breaking versions.

## 0.8.3 → 1.0.0

### DDO structure

The whole structure of the DDO has been changed based on [OEP-12](https://github.com/oceanprotocol/OEPs/tree/master/12) and [OEP-8 v0.4](https://github.com/oceanprotocol/OEPs/tree/master/8/v0.4) to better accomodate the DDOs to hold additional services, like execution of workflows and algorithms.

For migrating we only have to deal with the `metadata` service holding the asset metadata, which was restructured too:

old:

```json
{
  "service": [
    {
      "serviceDefinitionId": "0",
      "serviceEndpoint": "http://localhost:5000/api/v1/aquarius/assets/ddo/{did}",
      "type": "Metadata",
      "metadata": {
        "base": {
          "name": "Madrid Weather forecast",
          "description": "Wheater forecast of Europe/Madrid in XML format",
          "dateCreated": "2019-05-16T12:36:14.535Z",
          "author": "Norwegian Meteorological Institute",
          "type": "dataset",
          "license": "Public Domain",
          "price": "123000000000000000000",
          "copyrightHolder": "Norwegian Meteorological Institute",
          "files": [
            {
              "index": 0,
              "url": "https://example-url.net/weather/forecast/madrid/350750305731.xml",
              "contentLength": 1000,
              "contentType": "text/xml",
              "compression": "none"
            }
          ],
          "categories": ["Other"],
          "links": [],
          "tags": []
        },
        "additionalInformation": {
          "updateFrequency": null,
          "structuredMarkup": []
        }
      }
    }
  ]
}
```

NEW. Where `main` now holds the non-changable attributes only, everything else has been moved to `additionalInformation`. Likewise, `serviceDefinitionId` is now `index`:

```json
{
  "service": [
    {
      "index": 0,
      "serviceEndpoint": "http://localhost:5000/api/v1/aquarius/assets/ddo/{did}",
      "type": "metadata",
      "attributes": {
        "main": {
          "name": "Madrid Weather forecast",
          "dateCreated": "2019-05-16T12:36:14.535Z",
          "author": "Norwegian Meteorological Institute",
          "type": "dataset",
          "license": "Public Domain",
          "price": "123000000000000000000",
          "files": [
            {
              "index": 0,
              "url": "https://example-url.net/weather/forecast/madrid/350750305731.xml",
              "contentLength": "1000",
              "contentType": "text/xml",
              "compression": "none"
            }
          ]
        },
        "additionalInformation": {
          "description": "Weather forecast of Europe/Madrid in XML format",
          "copyrightHolder": "Norwegian Meteorological Institute",
          "categories": ["Other"],
          "links": [],
          "tags": [],
          "updateFrequency": null,
          "structuredMarkup": []
        }
      }
    }
  ]
}
```

Those changes require updates to your code whenever you fetch or create a new DDO as outlined below.

### Lowercase service names

All the service names are now in lowercase:

old:

```js
const service = ddo.findServiceByType('Access')
```

NEW:

```js
const service = ddo.findServiceByType('access')
```

### Accessing new metadata structure

Typically you would grab and restructure asset metadata for display. This works the same as before but the key names have changed:

old:

```js
const { metadata } = ddo.findServiceByType('Metadata')
const { base, additionalInformation } = metadata
console.log(base.price)
console.log(base.description)
```

NEW:

```js
const { attributes } = ddo.findServiceByType('metadata')
const { main, additionalInformation } = attributes
console.log(main.price)
console.log(additionalInformation.description)
```

### `service.serviceDefinitionId` → `service.index`

old:

```js
await ocean.assets.order(ddo.id, service.serviceDefinitionId, accounts[0])
```

NEW:

```js
await ocean.assets.order(ddo.id, service.index, accounts[0])
```

### File attribute changes

In the file attributes, the `contentLength` is now a string.

old:

```json
"files": [
  {
    "index": 0,
    "url": "https://example-url.net/weather/forecast/madrid/350750305731.xml",
    "contentLength": 1000,
    "contentType": "text/xml"
  }
]
```

NEW:

```json
"files": [
  {
    "index": 0,
    "url": "https://example-url.net/weather/forecast/madrid/350750305731.xml",
    "contentLength": "1000",
    "contentType": "text/xml"
  }
]
```