Mock include property in findMany with Prisma

Question

I have setup my project with TypeScript and Jest. I have a repository method that fetches all posts with their comments like so:

const data = await prisma.post.findMany({ include: { comments: true } })

After that I manipulate the comments via data.comments.map(...). This is where my tests fail. The errors I get tell me that data.comments is undefined.

This is how I mock the the findMany method call:

prismaMock.site.findMany.mockResolvedValue([
  {
    id: '1',
    title: 'mock',
    text: 'test',
    commentIDs: [],
  },
])

If I try to add countries: [] to the mock, then TypeScript complains by saying this property is not part of the Post type.

Is there a way to mock the data I get from the include part of the request?

Answer 1

Turns out all I had to do is store the mocked data in a variable without giving it a type:

const mockedData = [
  {
    id: '1',
    title: 'mock',
    text: 'test',
    commentIDs: [],
  },
]

And then:

prismaMock.post.findMany. mockResolvedValue(mockedData)