Create Blockchain Model.js

pi-nexus-blockchain/models/Blockchain Model.js

@@ -0,0 +1,47 @@
+import { Model, DataTypes } from 'sequelize';
+import { sequelize } from '../database';
+import { NexusModel } from './NexusModel';
+
+class BlockchainModel extends Model {
+  static init(sequelize) {
+    super.init({
+      id: {
+        type: DataTypes.UUID,
+        defaultValue: DataTypes.UUIDV4,
+        primaryKey: true,
+      },
+      networkId: {
+        type: DataTypes.STRING,
+        allowNull: false,
+      },
+      chainId: {
+        type: DataTypes.STRING,
+        allowNull: false,
+      },
+      blockNumber: {
+        type: DataTypes.BIGINT,
+        allowNull: false,
+        defaultValue: 0,
+      },
+    }, {
+      sequelize,
+      modelName: 'Blockchain',
+      tableName: 'blockchains',
+      timestamps: true,
+      underscored: true,
+    });
+  }
+
+  static associate(models) {
+    this.hasMany(models.Nexus, { foreignKey: 'blockchainId', onDelete: 'CASCADE' });
+  }
+
+  async updateBlockNumber() {
+    const web3 = new Web3(new Web3.providers.HttpProvider(`https://mainnet.infura.io/v3/YOUR_PROJECT_ID`));
+    const blockNumber = await web3.eth.getBlockNumber();
+    this.blockNumber = blockNumber;
+    await this.save();
+  }
+}
+
+export default BlockchainModel;