add delegators table and schema

apps/explorer/lib/explorer/chain/staking_pools_delegators.ex

@@ -0,0 +1,64 @@
+defmodule Explorer.Chain.StakingPoolsDelegators do
+  @moduledoc """
+  The representation of delegators from POSDAO network.
+  Delegators make stakes on staking pools and withdraw from them.
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias Explorer.Chain.{
+    Address,
+    Hash,
+    StakingPool,
+    Wei
+  }
+
+  @type t :: %__MODULE__{
+          pool_address_hash: Hash.Address.t(),
+          delegator_address_hash: Hash.Address.t(),
+          max_ordered_withdraw_allowed: Wei.t(),
+          max_withdraw_allowed: Wei.t(),
+          ordered_withdraw: Wei.t(),
+          stake_amount: Wei.t(),
+          ordered_withdraw_epoch: integer()
+        }
+
+  @attrs ~w(
+    pool_address_hash delegator_address_hash max_ordered_withdraw_allowed
+    max_withdraw_allowed ordered_withdraw stake_amount ordered_withdraw_epoch
+  )a
+
+  schema "staking_pools_delegators" do
+    field(:max_ordered_withdraw_allowed, Wei)
+    field(:max_withdraw_allowed, Wei)
+    field(:ordered_withdraw, Wei)
+    field(:ordered_withdraw_epoch, :integer)
+    field(:stake_amount, Wei)
+
+    belongs_to(
+      :staking_pool,
+      StakingPool,
+      foreign_key: :pool_address_hash,
+      references: :staking_address_hash,
+      type: Hash.Address
+    )
+
+    belongs_to(
+      :delegator_address,
+      Address,
+      foreign_key: :delegator_address_hash,
+      references: :hash,
+      type: Hash.Address
+    )
+
+    timestamps(null: false, type: :utc_datetime_usec)
+  end
+
+  @doc false
+  def changeset(staking_pools_delegators, attrs) do
+    staking_pools_delegators
+    |> cast(attrs, @attrs)
+    |> validate_required(@attrs)
+    |> unique_constraint(:pool_address_hash, name: :pools_delegator_index)
+  end
+end

apps/explorer/priv/repo/migrations/20190523112839_create_staking_pools_delegators.exs

@@ -0,0 +1,26 @@
+defmodule Explorer.Repo.Migrations.CreateStakingPoolsDelegators do
+  use Ecto.Migration
+
+  def change do
+    create table(:staking_pools_delegators) do
+      add(:delegator_address_hash, :bytea)
+      add(:pool_address_hash, :bytea)
+      add(:stake_amount, :numeric, precision: 100)
+      add(:ordered_withdraw, :numeric, precision: 100)
+      add(:max_withdraw_allowed, :numeric, precision: 100)
+      add(:max_ordered_withdraw_allowed, :numeric, precision: 100)
+      add(:ordered_withdraw_epoch, :integer)
+
+      timestamps(null: false, type: :utc_datetime_usec)
+    end
+
+    create(index(:staking_pools_delegators, [:delegator_address_hash]))
+
+    create(
+      index(:staking_pools_delegators, [:delegator_address_hash, :pool_address_hash],
+        unique: true,
+        name: :pools_delegator_index
+      )
+    )
+  end
+end

apps/explorer/test/explorer/chain/staking_pools_delegators_test.exs

@@ -0,0 +1,18 @@
+defmodule Explorer.Chain.StakingPoolsDelegatorsTest do
+  use Explorer.DataCase
+
+  alias Explorer.Chain.StakingPoolsDelegators
+
+  describe "changeset/2" do
+    test "with valid attributes" do
+      params = params_for(:staking_pools_delegators)
+      changeset = StakingPoolsDelegators.changeset(%StakingPoolsDelegators{}, params)
+      assert changeset.valid?
+    end
+
+    test "with invalid attributes" do
+      changeset = StakingPoolsDelegators.changeset(%StakingPoolsDelegators{}, %{pool_address_hash: 0})
+      refute changeset.valid?
+    end
+  end
+end

apps/explorer/test/support/factory.ex

@@ -27,7 +27,8 @@ defmodule Explorer.Factory do
     Token,
     TokenTransfer,
     Transaction,
-    StakingPool
+    StakingPool,
+    StakingPoolsDelegators
   }
 
   alias Explorer.Market.MarketHistory
@@ -628,4 +629,18 @@ defmodule Explorer.Factory do
       was_validator_count: 1
     }
   end
+
+  def staking_pools_delegators_factory do
+    wei_per_ether = 1_000_000_000_000_000_000
+
+    %StakingPoolsDelegators{
+      pool_address_hash: address_hash(),
+      delegator_address_hash: address_hash(),
+      max_ordered_withdraw_allowed: wei_per_ether * 100,
+      max_withdraw_allowed: wei_per_ether * 50,
+      ordered_withdraw: wei_per_ether * 600,
+      stake_amount: wei_per_ether * 200,
+      ordered_withdraw_epoch: 2
+    }
+  end
 end