Item prices

[anhthang]

Add ItemPrice model and exposes per-version item pricing data

• Populate item prices from a new CSV source: ‎data/v2/csv/item_prices.csv
• Remove the old ‎Item.cost field in favor of the new structured pricing model.

Closes #1406

Example REST API response

GET /api/v2/item/305/

{
    "id": 305,
    "name": "some-item-name",
    "fling_power": null,
    "fling_effect": null,
    "category": {
        "name": "held-items"
    },
    "prices": [
        {
            "is_purchasable": true,
            "purchase_price": 3000,
            "sell_price": 1500,
            "version_group": {
                "name": "red-blue",
                "url": "https://pokeapi.co/api/v2/version-group/1/"
            }
        },
        {
            "is_purchasable": false,
            "purchase_price": null,
            "sell_price": 1500,
            "version_group": {
                "name": "ruby-sapphire",
                "url": "https://pokeapi.co/api/v2/version-group/3/"
            }
        }
    ]
}

Example GraphQL queries

v1beta: item with prices

query ItemWithPrices {
  pokemon_v2_item_by_pk(id: 305) {
    id
    name
    pokemon_v2_itemprices {
      is_purchasable
      purchase_price
      sell_price
      pokemon_v2_versiongroup {
        id
        name
      }
    }
  }
}

v1beta2: item with itemprice relation

query ItemWithItemprice {
  pokemon_v2_item_by_pk(id: 305) {
    id
    name
    itemprices {
      is_purchasable
      purchase_price
      sell_price
      versiongroup {
        id
        name
      }
    }
  }
}

{
    "data": {
        "item": [
            {
                "id": 305,
                "name": "tm01",
                "cost": null,
                "itemnames": [
                    {
                        "name": "TM01"
                    }
                ],
                "itemprices": [
                    {
                        "is_purchasable": true,
                        "purchase_price": 3000,
                        "sell_price": 1500,
                        "versiongroup": {
                            "id": 1,
                            "name": "red-blue",
                        }
                    },
                    {
                        "is_purchasable": false,
                        "purchase_price": null,
                        "sell_price": 1500,
                        "versiongroup": {
                            "id": 5,
                            "name": "ruby-sapphire",
                        }
                    }
                ]
            }
        ]
    }
}

[anhthang]

Hi @Naramsim! Could you share your thoughts on the new ItemPrice model and the prices API shape? I'd like to confirm this is the right direction.