add account balances with some random data

app/JsonApi/V3/AccountBalances/AccountBalanceRepository.php

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+<?php
+/*
+ * AccountBalanceRepository.php
+ * Copyright (c) 2024 james@firefly-iii.org.
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\JsonApi\V3\AccountBalances;
+
+use FireflyIII\Entities\AccountBalance;
+use LaravelJsonApi\Contracts\Store\QueriesAll;
+use LaravelJsonApi\NonEloquent\AbstractRepository;
+
+class AccountBalanceRepository extends AbstractRepository implements QueriesAll
+{
+
+    /**
+     * @inheritDoc
+     */
+    #[\Override] public function find(string $resourceId): ?object
+    {
+        return AccountBalance::fromArray();
+    }
+
+
+    /**
+     * @inheritDoc
+     */
+    public function queryAll(): Capabilities\AccountBalanceQuery
+    {
+        return Capabilities\AccountBalanceQuery::make()
+                                      ->withServer($this->server)
+                                      ->withSchema($this->schema);
+    }
+}

app/JsonApi/V3/AccountBalances/AccountBalanceResource.php

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+<?php
+
+namespace FireflyIII\JsonApi\V3\AccountBalances;
+
+use Illuminate\Http\Request;
+use LaravelJsonApi\Core\Resources\JsonApiResource;
+
+class AccountBalanceResource extends JsonApiResource
+{
+    /**
+     * Get the resource id.
+     *
+     * @return string
+     */
+    public function id(): string
+    {
+        return $this->resource->id;
+    }
+
+    /**
+     * Get the resource's attributes.
+     *
+     * @param Request|null $request
+     *
+     * @return iterable
+     */
+    public function attributes($request): iterable
+    {
+        return [
+            'name'   => $this->resource->amount,
+            'amount' => $this->resource->amount,
+        ];
+    }
+
+    /**
+     * Get the resource's relationships.
+     *
+     * @param Request|null $request
+     *
+     * @return iterable
+     */
+    public function relationships($request): iterable
+    {
+        return [
+            $this->relation('account')->withData($this->resource->getAccount()),
+        ];
+    }
+
+}

app/JsonApi/V3/AccountBalances/AccountBalanceSchema.php

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+<?php
+
+namespace FireflyIII\JsonApi\V3\AccountBalances;
+
+use FireflyIII\Entities\AccountBalance;
+use LaravelJsonApi\Core\Schema\Schema;
+use LaravelJsonApi\Eloquent\Fields\Relations\HasOne;
+use LaravelJsonApi\NonEloquent\Fields\Attribute;
+use LaravelJsonApi\NonEloquent\Fields\ID;
+
+class AccountBalanceSchema extends Schema
+{
+
+    /**
+     * The model the schema corresponds to.
+     *
+     * @var string
+     */
+    public static string $model = AccountBalance::class;
+
+    /**
+     * Get the resource fields.
+     *
+     * @return array
+     */
+    public function fields(): array
+    {
+        return [
+            ID::make(),
+            Attribute::make('name'),
+            Attribute::make('amount'),
+            HasOne::make('account'),
+        ];
+    }
+
+    /**
+     * Get the resource filters.
+     *
+     * @return array
+     */
+    public function filters(): array
+    {
+        return [
+            // Filter::make('id'),
+        ];
+    }
+
+    public function repository(): AccountBalanceRepository
+    {
+        return AccountBalanceRepository::make()
+                                       ->withServer($this->server)
+                                       ->withSchema($this);
+    }
+}

app/JsonApi/V3/AccountBalances/Capabilities/AccountBalanceQuery.php

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+<?php
+/*
+ * AccountBalanceQuery.php
+ * Copyright (c) 2024 james@firefly-iii.org.
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\JsonApi\V3\AccountBalances\Capabilities;
+
+use FireflyIII\Entities\AccountBalance;
+use FireflyIII\Models\Account;
+use LaravelJsonApi\NonEloquent\Capabilities\QueryAll;
+
+class AccountBalanceQuery extends QueryAll
+{
+    private Account $account;
+
+    /**
+     * QuerySites constructor.
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function get(): iterable
+    {
+        return [
+            AccountBalance::fromArray(),
+            AccountBalance::fromArray(),
+            AccountBalance::fromArray(),
+            AccountBalance::fromArray(),
+        ];
+    }
+
+    public function withAccount(Account $account): self
+    {
+        $this->account = $account;
+        return $this;
+    }
+
+}