Create fact for champion picked item

apps/lol_analytics/lib/lol_analytics/dimensions/item/item_repo.ex

@@ -2,10 +2,12 @@ defmodule LolAnalytics.Dimensions.Item.ItemRepo do
   alias LolAnalytics.Dimensions.Item.ItemSchema
   alias LoLAnalytics.Repo
 
-  def get_or_create(item_id) do
+  import Ecto.Query
-    item = Repo.get(ItemSchema, item_id: item_id)
 
-    case item do
+  def get_or_create(item_id) do
+    query = from i in ItemSchema, where: i.item_id == ^item_id
+
+    case Repo.one(query) do
       nil ->
         item_changeset = ItemSchema.changeset(%ItemSchema{}, %{item_id: item_id})
         Repo.insert(item_changeset)

apps/lol_analytics/lib/lol_analytics/facts/champion_picked_item/fact_processor.ex

@@ -0,0 +1,2 @@
+defmodule LolAnalytics.Facts.ChhampionPickedItem.FactProcessor do
+end

apps/lol_analytics/lib/lol_analytics/facts/champion_picked_item/repo.ex

@@ -0,0 +1,87 @@
+defmodule LolAnalytics.Facts.ChampionPickedItem.Repo do
+  import Ecto.Query
+
+  alias LolAnalytics.Dimensions.Item.ItemSchema
+  alias LolAnalytics.Dimensions.Champion.ChampionSchema
+  alias LolAnalytics.Facts.ChhampionPickedItem.Schema
+  alias LolAnalytics.Dimensions.Item.ItemRepo
+  alias LolAnalytics.Dimensions.Player.PlayerRepo
+  alias LolAnalytics.Dimensions.Champion.ChampionRepo
+  alias LolAnalytics.Dimensions.Match.MatchRepo
+  alias LoLAnalytics.Repo
+
+  @doc """
+  Inserts a new entry for the campion_picked_item fact.
+
+  Example:
+
+  iex> item_picked = %{champion_id: 90, item_id: 1, match_id: "123", patch_number: "14.9", puuid: "1223", slot_number: 1, queue_id: 420, team_position: "JUNGLE", slot_number: 1, is_win: true}
+  iex> LolAnalytics.Facts.ChampionPickedItem.Repo.insert(item_picked)
+  """
+  @spec insert(%{
+          :champion_id => integer(),
+          :item_id => integer(),
+          :match_id => binary(),
+          :patch_number => String.t(),
+          :puuid => String.t(),
+          :is_win => boolean(),
+          :queue_id => integer(),
+          :team_position => String.t(),
+          :slot_number => integer()
+        }) :: {:ok, Ecto.Schema.t()} | {:error, Ecto.Changeset.t()}
+  def insert(attrs) do
+    IO.inspect(attrs)
+    _match = MatchRepo.get_or_create(attrs.match_id)
+    _champion = ChampionRepo.get_or_create(attrs.champion_id)
+    _player = PlayerRepo.get_or_create(attrs.puuid)
+    _patch = PlayerRepo.get_or_create(attrs.patch_number)
+    _item_id = ItemRepo.get_or_create(attrs.item_id)
+
+    prev =
+      from(f in Schema,
+        where:
+          f.match_id == ^attrs.match_id and
+            f.puuid == ^attrs.puuid and
+            f.item_id == ^attrs.item_id and
+            f.slot_number == ^attrs.slot_number
+      )
+      |> Repo.one()
+
+    Schema.changeset(prev || %Schema{}, attrs)
+    |> Repo.insert_or_update()
+  end
+
+  @spec get_champion_picked_items(String.t(), String.t()) :: list()
+  def get_champion_picked_items(champion_id, team_position) do
+    query =
+      from f in Schema,
+        where:
+          f.champion_id == ^champion_id and
+            f.team_position == ^team_position,
+        join: c in ChampionSchema,
+        on: c.champion_id == f.champion_id,
+        join: i in ItemSchema,
+        on: i.item_id == f.item_id,
+        select: %{
+          wins: fragment("count(CASE WHEN ? THEN 1 END)", f.is_win),
+          win_rate:
+            fragment(
+              "
+              ((cast(count(CASE WHEN ? THEN 1 END) as float) / cast(count(*) as float)) * 100.0
+              )",
+              f.is_win
+            ),
+          item_id: i.item_id,
+          champion_id: c.champion_id,
+          team_position: f.team_position,
+          total_games: count("*")
+        },
+        group_by: [
+          i.item_id,
+          c.champion_id,
+          f.team_position
+        ]
+
+    Repo.all(query)
+  end
+end

apps/lol_analytics/lib/lol_analytics/facts/champion_picked_item/schema.ex

@@ -0,0 +1,34 @@
+defmodule LolAnalytics.Facts.ChhampionPickedItem.Schema do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @casting_args [
+    :champion_id,
+    :item_id,
+    :match_id,
+    :is_win,
+    :queue_id,
+    :patch_number,
+    :team_position,
+    :puuid,
+    :slot_number
+  ]
+
+  schema "fact_champion_picked_item" do
+    field :champion_id, :integer
+    field :item_id, :integer
+    field :match_id, :string
+    field :is_win, :boolean
+    field :queue_id, :integer
+    field :patch_number, :string
+    field :team_position, :string
+    field :puuid, :string
+    field :slot_number, :integer
+  end
+
+  def changeset(fact, attrs) do
+    fact
+    |> cast(attrs, @casting_args)
+    |> validate_required(@casting_args)
+  end
+end

apps/lol_analytics/priv/repo/migrations/20240611123000_champion_picked_item.exs

@@ -0,0 +1,28 @@
+defmodule LoLAnalytics.Repo.Migrations.ChampionPickedItem do
+  use Ecto.Migration
+
+  def change do
+    create table("fact_champion_picked_item") do
+      add :champion_id, references("dim_champion", column: :champion_id, type: :integer)
+      add :item_id, references("dim_item", column: :item_id, type: :integer)
+      add :slot_number, :integer
+      add :match_id, references("dim_match", column: :match_id, type: :string)
+      add :is_win, :boolean
+      add :game_length_seconds, :integer
+      add :queue_id, :integer
+      add :patch_number, references("dim_patch", column: :patch_number, type: :string)
+      add :team_position, :string
+      add :puuid, references("dim_player", column: :puuid, type: :string)
+    end
+
+    create index("fact_champion_picked_item", [:champion_id])
+    create index("fact_champion_picked_item", [:puuid, :match_id, :slot_number, :item_id], unique: true)
+    create index("fact_champion_picked_item", [
+             :item_id,
+             :queue_id,
+             :is_win,
+             :patch_number,
+             :team_position
+           ])
+  end
+end