182 lines
4.8 KiB
Markdown
182 lines
4.8 KiB
Markdown
# serra
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Serra is my personal *Magic: The Gathering* collection tracker.
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It began as a holiday project in winter 2021/2022 because I was frustrated of
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Collection Tracker Websites that are:
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* Pain to use
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* Want ~$10 a month
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* Don't have the features I want
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So I started my own Collection Tracker using [Golang](https://golang.org),
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[MongoDB](https://mongodb.com) and [Scryfall](https://scryfall.com) to have
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an overview in what cards you own and what value they are.
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## What Serra does
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* Tracks prices
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* Calculates statistics
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* Query/filter all of your cards
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* Shows what cards/sets do best in value development.
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## What Serra does not
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* Does not give a shit about conditions (NM, M, GD...)
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* Does not track if card is foil or not (may come in the future)
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* Is not configurable to have Dollar/US Prices
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# Quickstart
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Spin up a MongoDB (you can use docker-compose)
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docker-compose up -d
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Add a card
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./serra add usg/17
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Start exploring :) (the more cards you add, the more fun it is)
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# Usage
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```
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./serra
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Usage:
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serra add <cardid>... [--count=<number>]
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serra remove <cardid>...
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serra cards [--rarity=<rarity>] [--set=<setcode>] [--sort=<sort>]
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serra card <cardid>...
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serra tops [--limit=<limit>]
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serra flops [--limit=<limit>]
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serra missing <setcode>
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serra set <setcode>
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serra sets
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serra update
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serra stats
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```
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## Add
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To add a card to your collection.
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## Cards
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Query all of your cards with filters
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## Sets
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List all your sets
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## Set
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Show details of a single set
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## Stats
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Calculate some stats for all of your cards
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## Tops
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Show what cards/set gained most value
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## Flops
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Show what cards/set lost most value
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## Update
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The update mechanism iterates over each card in your collection and fetches
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its price. After all cards you own in a set are updated, the set value will
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update. After all Sets are updated, the whole collection value is updated.
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## Adding all those cards, manually?
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Yes. While there are serveral OCR/Photo Scanners for mtg cards, I found they
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are not accurate enough. They guess Editions wrong, they have problems with
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blue/black cards and so on.
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I add my cards using a tiny shell wrapper, since they are sorted by editions
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anyways.
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```
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./add-card-wrapper.fish usg
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read> 17
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👼🏻 Serra 0.0.1
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Updating Card "Herald of Serra" amount to 2
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read> 18
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...
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```
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Its basically typing 2-3 digit numbers and hitting enter. I was way faster
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with this approach then Smartphone scanners.
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# Development
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## Install
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go build .
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./serra
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## Cheatsheet Queries
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Find cards that increased prices
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db.cards.find({$expr: {$gt: [{$arrayElemAt: ["$serra_prices", -2]}, {$arrayElemAt: ["$serra_prices", -1]}]}}, {name:1})
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Update card Price
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db.cards.update(
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{'_id':'8fa2ecf9-b53c-4f1d-9028-ca3820d043cb'},
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{$set:{'serra_updated':ISODate("2021-11-02T09:28:56.504Z")},
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$push: {"serra_prices": { date: ISODate("2021-11-02T09:28:56.504Z"), value: 0.1 }}});
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Set value
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db.cards.aggregate([{ $group: { _id: { set: "$set" }, value: { $sum: { $multiply: ["$prices.eur", "$serra_count"] } }, count: { $sum: 1 } } }])
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Color distribution
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db.cards.aggregate([{ $group: { _id: { color: "$colors" }, count: { $sum: 1 } } }])
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Calculate value of all sets
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db.sets.aggregate({$match: {serra_prices: {$exists: true}}}, {$project: {name: 1, "totalValue": {$arrayElemAt: ["$serra_prices", -1]} }}, {$group: {_id: null, total: {$sum: "$totalValue.value" }}})
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Calculate what cards gained most value in percent
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db.cards.aggregate({$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}})
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## MongoDB Operations
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A few commands that do backups and exports of your data inside of the docker
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container.
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Do a database dump
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mongodump -u root -p root --authenticationDatabase admin -d serra -o /backup/
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Do a collection export to json
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mongoexport -u root -p root --authenticationDatabase admin -d serra -c cards > /backup/cards.json
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mongoexport -u root -p root --authenticationDatabase admin -d serra -c sets > /backup/sets.json
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mongoexport -u root -p root --authenticationDatabase admin -d serra -c total > /backup/total.json
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