RVRNEXT-5 add model and repository for currency exchange rate

src/PersistentData/Model/CurrencyExchangeRate.php

@@ -0,0 +1,71 @@
+<?php namespace RVR\PersistentData\Model;
+
+use DateTime;
+use SokoWeb\PersistentData\Model\Model;
+
+class CurrencyExchangeRate extends Model
+{
+    protected static string $table = 'currency_exchange_rates';
+
+    protected static array $fields = ['currency_id', 'exchange_rate', 'valid_from'];
+
+    protected static array $relations = ['currency' => Currency::class];
+
+    private ?Currency $currency = null;
+
+    private ?int $currencyId = null;
+
+    private float $exchangeRate = 0.0;
+
+    private DateTime $validFrom;
+
+    public function setCurrency(Currency $currency): void
+    {
+        $this->currency = $currency;
+    }
+
+    public function setCurrencyId(int $currencyId): void
+    {
+        $this->currencyId = $currencyId;
+    }
+
+    public function setExchangeRate(float $exchangeRate): void
+    {
+        $this->exchangeRate = $exchangeRate;
+    }
+
+    public function setValidFromDate(DateTime $validFrom): void
+    {
+        $this->validFrom = $validFrom;
+    }
+
+    public function setValidFrom(string $validFrom): void
+    {
+        $this->validFrom = new DateTime($validFrom);
+    }
+
+    public function getCurrency(): ?Currency
+    {
+        return $this->currency;
+    }
+
+    public function getCurrencyId(): ?int
+    {
+        return $this->currencyId;
+    }
+
+    public function getExchangeRate(): float
+    {
+        return $this->exchangeRate;
+    }
+
+    public function getValidFromDate(): DateTime
+    {
+        return $this->validFrom;
+    }
+
+    public function getValidFrom(): string
+    {
+        return $this->validFrom->format('Y-m-d H:i:s');
+    }
+}

src/Repository/CurrencyExchangeRateRepository.php

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+<?php namespace RVR\Repository;
+
+use Generator;
+use Container;
+use RVR\PersistentData\Model\Currency;
+use RVR\PersistentData\Model\CurrencyExchangeRate;
+use SokoWeb\Database\Query\Select;
+
+class CurrencyExchangeRateRepository
+{
+    public function getById(int $id): ?CurrencyExchangeRate
+    {
+        return \Container::$persistentDataManager->selectFromDbById($id, CurrencyExchangeRate::class);
+    }
+
+    public function getAllByCurrency(Currency $currency): Generator
+    {
+        $select = new Select(Container::$dbConnection);
+        $select->where('currency_id', '=', $currency->getId());
+        $select->orderBy('valid_from');
+
+        yield from Container::$persistentDataManager->selectMultipleFromDb($select, CurrencyExchangeRate::class);
+    }
+}