fix(kitsu-core): deserialize meta only relationships

[pedep]

same as with links only:

kitsu/packages/kitsu-core/src/deserialise/index.spec.js

Lines 161 to 188 in d261d4c

	it('deserialises relationships with links', () => {
	expect.assertions(1)
	expect(deserialise({
	data: {
	id: '1',
	type: 'users',
	relationships: {
	followers: {
	links: {
	self: 'https://kitsu.example/users/1/relationships/followers',
	related: 'https://kitsu.example/users/1/followers'
	}
	}
	}
	}
	})).toEqual({
	data: {
	id: '1',
	type: 'users',
	followers: {
	links: {
	self: 'https://kitsu.example/users/1/relationships/followers',
	related: 'https://kitsu.example/users/1/followers'
	}
	}
	}
	})
	})

Section 5.2.4 of documentation states "A “relationship object” MUST contain at least one of the following: links, data or meta", so meta-only relationships should be just as valid as links only.

With this we PR support all cases.

The test-case for links, meta and data at the same time is handled indirectly by other specs, such as here:

kitsu/packages/kitsu-core/src/deserialise/index.spec.js

Lines 791 to 852 in d261d4c

	it('Deserializes nested single circular resource', () => {
	expect.assertions(1)
	const input = JSON.parse(stringify(deserialise({
	data: [
	{
	id: '1',
	type: 'anime',
	attributes: { name: 'A' },
	relationships: {
	user: {
	data: {
	id: '1',
	type: 'users'
	},
	links: {
	self: 'https://kitsu.example/user',
	related: 'https://kitsu.example/user'
	},
	meta: {
	hello: 'world'
	}
	}
	}
	},
	{
	id: '2',
	type: 'anime',
	attributes: { name: 'B' },
	relationships: {
	user: {
	data: {
	id: '1',
	type: 'users'
	}
	}
	}
	}
	],
	included: [
	{
	id: '1',
	type: 'users',
	attributes: { name: 'B' },
	relationships: {
	favorite_anime: {
	data: {
	id: '1',
	type: 'anime'
	},
	links: {
	self: 'https://kitsu.example/favorite_anime',
	related: 'https://kitsu.example/favorite_anime'
	},
	meta: {
	test: '123123'
	}
	}
	}
	}
	]
	})))

[codeclimate]

Code Climate has analyzed commit a71c9db and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (100% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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[wopian]

Released as 9.1.29 and 10.0.2