[DN] Implement API to fetch single story

We’re relying on a cache in StoriesRepository to get the data required to display a Designer News story:

class GetStoryUseCase @Inject constructor(private val storiesRepository: StoriesRepository) {

    operator fun invoke(id: Long): Result<Story> {
        val result = storiesRepository.getStory(id)
        return if (result is Result.Success) {
            Result.Success(result.data.toStory())
        } else {
            Result.Error(IllegalStateException("Story $id not cached"))
        }
    }
}

The cache is populated when retrieving a bundle of stories from the API StoriesRepository.loadStories(page: Int).

If the story is not present in the cache, then we’ll return an error.

---

This blocks #436 because it’s not possible to populate this cache from the scraped search API because we only get ID and title. The two proposed solutions in that ticket

• chain the search call onto fetching the full data for each of the stories
• (I started working on this one) introduce a new StorySearchResult PlaidItem (which only needs ID, title) and defer the fetch until opening the details

each depend on there being an API for fetching an individual story.

[ZacSweers]

Wait ignore me, this is for stories and not for users like I was doing 😃. That seeeeems like it should be more robust since that’s arguably the most important part of the API. The structure of that impl might still be helpful examples for this though

[ZacSweers]

There be dragons here. I wrote about this a bit in a blog post (the designer news section): https://link.medium.com/shZ1GO6KDT

TL;DR - in my experience, that endpoint basically never worked most of the time. Maybe they’ve improved it though!