Serialize and Deserialize

Requirements

We have to provide serialize and deserialize in redis hash. Because, serialize doesn’t require id in values.
And it’s not appropriate storing specific format and data in redis because of time zone, data storage cost.
However, deserialized data requires id and specific format.

How to resolve it?

Define serialize and deserialize helper function. For about Javascript Date , id (PK).

Serialize requirements

• Remove id for saving storage cost
  Client already knows what the key is for searching.
• Transform from specific date object to string type which is searched easily in string.

Example code

function serializeItem(attrs: CreateItemAttrs) {
  return {
    // epoch milliseconds
    // insert as 'string' instead of Date object type.
    createdAt: attrs.createdAt.toMillis(),
    endingAt: attrs.endingAt.toMillis()
  };
}

Deserialize requirements

• Transform data type
  • from empty string('') to undefined or null
  • from string ‘5’ to number 5
  • from string ‘March-5-2023’ to Date object
• Insert id in object

Example

// Include id and convert string to date object, number etc..
function deserializeItem(id: string, item: { [key: string]: string }): Item {
  return {
    // item is not object type
    // so it's not possible to use spread operator.
    id: id,
    name: item.name,
    ownerId: item.ownerId,
    imageUrl: item.imageurl,
    description: item.description,
    createdAt: DateTime.fromMillis(Number(item.createdAt)),
    endingAt: DateTime.fromMillis(Number(item.endingAt)),
    views: Number(item.views),
    likes: Number(item.likes),
    price: Number(item.price),
    bids: Number(item.bids),
    highestBidUserId: item.highestBidUserId
  };
}