The required property '0' is not found in the type 'any[]' but it is needed in the type '[{ post_id: string; title: string; }]'

I have gone through this post but I am still struggling to understand the issue. Why am I unable to pass this array to the update call?

// create a new object with updated post properties
const newPost = await this.postRepository.create(data);
await this.postRepository.save(newPost);

// add post id to the posts array
const posts = [];
posts.push({
  post_id: newPost.post_id,
  title: newPost.title,
});

const updatedUser = {
  posts,
};

// update user to include the posts array
await this.userService.edit(data.user_id, updatedUser); // getting error on updatedUser

export interface UserDTO {
  user_id: string;
  name: string;
  posts: [
    {
      post_id: string;
      title: string;
    },
  ];
}

Answer №1

entries: [
    {
      entry_id: string;
      content: string;
    },
  ];

This defines entries as a tuple, rather than just an array. It specifies that entries will contain precisely one element, which must be of the type

{ entry_id: string, content: string }
.

If you were to initialize this structure like so:

const entries = [];

... then it would simply be a regular array of any type. This array could have any number of elements, making it incompatible with the tuple definition that requires exactly one specific element.

In all likelihood, using a tuple was an error in this case. Consider updating the type definition to:

entries: {
  entry_id: string;
  content: string;
}[]

However, if the intention is for it to be a tuple, then you must declare the variable accordingly:

const entries: [{ entry_id: string, content: string }] = [{
  entry_id: newEntry.entry_id,
  content: newEntry.content,
}]

Answer №2

Not an array here! It is actually a tuple with only one element.

posts: [
    {
      post_id: string;
      title: string;
    },
]

If you are looking for an array instead, use this syntax:

posts: {
  post_id: string;
  title: string;
}[]

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