closes#9520
- it contains a dependency bump of the latest Bookshelf release
- Bookshelf introduced a bug in the last release
- see https://github.com/bookshelf/bookshelf/pull/1583
- see https://github.com/bookshelf/bookshelf/pull/1798
- this has caused trouble in Ghost
- the `updated_at` attribute was not automatically set anymore
---
The bookshelf added one breaking change: it's allow to pass custom `updated_at` and `created_at`.
We already have a protection for not being able to override the `created_at` date on update.
We had to add another protection to now allow to only change the `updated_at` property.
You can only change `updated_at` if you actually change something else e.g. the title of a post.
To be able to implement this check i discovered that Bookshelfs `model.changed` object has a tricky behaviour.
It remembers **all** attributes, which where changed, doesn't matter if they are valid or invalid model properties.
We had to add a line of code to avoid remembering none valid model attributes in this object.
e.g. you change `tag.parent` (no valid model attribute). The valid property is `tag.parent_id`.
If you pass `tag.parent` but the value has **not** changed (`tag.parent` === `tag.parent_id`), it will output you `tag.changed.parent`. But this is wrong.
Bookshelf detects `changed` attributes too early. Or if you think the other way around, Ghost detects valid attributes too late.
But the current earliest possible stage is the `onSaving` event, there is no earlier way to pick valid attributes (except of `.forge`, but we don't use this fn ATM).
Later: the API should transform `tag.parent` into `tag.parent_id`, but we are not using it ATM, so no need to pre-optimise.
The API already transforms `post.author` into `post.author_id`.
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