serra/readme.md

serra

Serra is my personal Magic: The Gathering collection tool. It uses a MongoDB and Scryfall.

What Serra does

• tracks prices
• calculates statistics
• shows what cards/sets do best in value development.

What Serra does not

• Does not give a shit about conditions (NM, M, GD...)
• Does not track if card is foil or not (may come in the future)
• Its not configurable to have Dollar/US Prices

Quickstart

Spin up a MongoDB (you can use docker-compose)

docker-compose up -d

Add a card

./serra add usg/17

Start exploring :) (the more cards you add, the more fun it is)

Usage

./serra
Usage:
  serra add <cardid>... [--count=<number>]
  serra remove <cardid>...
  serra cards [--rarity=<rarity>] [--set=<setcode>] [--sort=<sort>]
  serra card <cardid>...
  serra tops [--limit=<limit>]
  serra flops [--limit=<limit>]
  serra missing <setcode>
  serra set <setcode>
  serra sets
  serra update
  serra stats

Add

To add a card to your collection

Cards

Query all of your cards with filters

Sets

List all your sets

Set

Show details of a single set

Stats

Calculate some stats for all of your cards

Tops

Show what cards/se gained most value

Update

The update mechanism iterates over each card in your collection and fetches its price. After all cards you own in a set are updated, the set value will update. After all Sets are updated, the whole collection value is updated.

Install

go build .
./serra

Todo

• prices since the beginning
• calculate biggest gaining cards (Up XX %!)
• display (+/-) % in sets overview
• display (+/-) % in history views
• Reserved List
• Mythic

Cheatsheet Queries

Find cards that increased prices

db.cards.find({$expr: {$gt: [{$arrayElemAt: ["$serra_prices", -2]}, {$arrayElemAt: ["$serra_prices", -1]}]}}, {name:1})

Update card Price

	db.cards.update(
	{'_id':'8fa2ecf9-b53c-4f1d-9028-ca3820d043cb'},
	{$set:{'serra_updated':ISODate("2021-11-02T09:28:56.504Z")},
	$push: {"serra_prices": { date: ISODate("2021-11-02T09:28:56.504Z"), value: 0.1 }}});

Set value

db.cards.aggregate([{ $group: { _id: { set: "$set" }, value: { $sum: { $multiply: ["$prices.eur", "$serra_count"] } }, count: { $sum: 1 } } }])

Color distribution

 db.cards.aggregate([{ $group: { _id: { color: "$colors" }, count: { $sum: 1 } } }])

Calculate value of all sets

db.sets.aggregate({$match: {serra_prices: {$exists: true}}}, {$project: {name: 1, "totalValue": {$arrayElemAt: ["$serra_prices", -1]} }}, {$group: {_id: null, total: {$sum: "$totalValue.value" }}})

Calculate what cards gained most value in percent

db.cards.aggregate({$project: {set: 1, collectornumber:1, name: 1, "old": {$arrayElemAt: ["$serra_prices.value", -2]}, "current": {$arrayElemAt: ["$serra_prices.value", -1]} }}, {$match: {old: {$gt: 2}}} ,{$project: {name: 1,set:1,collectornumber:1,current:1, "rate": {$subtract: [{$divide: ["$current", {$divide: ["$old", 100]}]}, 100]} }}, {$sort: { rate: -1}})

MongoDB Operations

A few commands that do backups and exports of your data inside of the docker container.

Do a database dump

mongodump  -u root -p root --authenticationDatabase admin -d serra -o /backup/

Do a collection export to json

mongoexport  -u root -p root --authenticationDatabase admin -d serra -c cards > /backup/cards.json
mongoexport  -u root -p root --authenticationDatabase admin -d serra -c sets > /backup/sets.json
mongoexport  -u root -p root --authenticationDatabase admin -d serra -c total > /backup/total.json