添加银行端后端接口

bank-backend/models/LoanContract.js

@@ -0,0 +1,235 @@
+/**
+ * 贷款合同模型
+ * @file LoanContract.js
+ * @description 银行系统贷款合同数据模型
+ */
+const { DataTypes } = require('sequelize');
+const BaseModel = require('./BaseModel');
+
+class LoanContract extends BaseModel {
+  /**
+   * 获取合同状态文本
+   * @returns {String} 状态文本
+   */
+  getStatusText() {
+    const statusMap = {
+      active: '已放款',
+      pending: '待放款',
+      completed: '已完成',
+      defaulted: '违约',
+      cancelled: '已取消'
+    };
+    return statusMap[this.status] || this.status;
+  }
+
+  /**
+   * 获取合同类型文本
+   * @returns {String} 类型文本
+   */
+  getTypeText() {
+    const typeMap = {
+      livestock_collateral: '畜禽活体抵押',
+      farmer_loan: '惠农贷',
+      business_loan: '商业贷款',
+      personal_loan: '个人贷款'
+    };
+    return typeMap[this.type] || this.type;
+  }
+
+  /**
+   * 格式化合同金额
+   * @returns {String} 格式化后的金额
+   */
+  getFormattedAmount() {
+    return `${this.amount.toFixed(2)}元`;
+  }
+
+  /**
+   * 计算剩余还款金额
+   * @returns {Number} 剩余金额
+   */
+  getRemainingAmount() {
+    return this.amount - (this.paidAmount || 0);
+  }
+
+  /**
+   * 计算还款进度百分比
+   * @returns {Number} 进度百分比
+   */
+  getRepaymentProgress() {
+    if (this.amount <= 0) return 0;
+    return Math.round(((this.paidAmount || 0) / this.amount) * 100);
+  }
+}
+
+// 初始化LoanContract模型
+LoanContract.init({
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true
+  },
+  contractNumber: {
+    type: DataTypes.STRING(50),
+    allowNull: false,
+    unique: true,
+    comment: '合同编号'
+  },
+  applicationNumber: {
+    type: DataTypes.STRING(50),
+    allowNull: false,
+    comment: '申请单号'
+  },
+  productName: {
+    type: DataTypes.STRING(200),
+    allowNull: false,
+    comment: '贷款产品名称'
+  },
+  farmerName: {
+    type: DataTypes.STRING(100),
+    allowNull: false,
+    comment: '申请养殖户姓名'
+  },
+  borrowerName: {
+    type: DataTypes.STRING(100),
+    allowNull: false,
+    comment: '贷款人姓名'
+  },
+  borrowerIdNumber: {
+    type: DataTypes.STRING(20),
+    allowNull: false,
+    comment: '贷款人身份证号'
+  },
+  assetType: {
+    type: DataTypes.STRING(50),
+    allowNull: false,
+    comment: '生资种类'
+  },
+  applicationQuantity: {
+    type: DataTypes.STRING(100),
+    allowNull: false,
+    comment: '申请数量'
+  },
+  amount: {
+    type: DataTypes.DECIMAL(15, 2),
+    allowNull: false,
+    comment: '合同金额'
+  },
+  paidAmount: {
+    type: DataTypes.DECIMAL(15, 2),
+    allowNull: false,
+    defaultValue: 0,
+    comment: '已还款金额'
+  },
+  status: {
+    type: DataTypes.ENUM(
+      'active',
+      'pending', 
+      'completed',
+      'defaulted',
+      'cancelled'
+    ),
+    allowNull: false,
+    defaultValue: 'pending',
+    comment: '合同状态'
+  },
+  type: {
+    type: DataTypes.ENUM(
+      'livestock_collateral',
+      'farmer_loan',
+      'business_loan',
+      'personal_loan'
+    ),
+    allowNull: false,
+    comment: '合同类型'
+  },
+  term: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    comment: '合同期限（月）'
+  },
+  interestRate: {
+    type: DataTypes.DECIMAL(5, 2),
+    allowNull: false,
+    comment: '利率'
+  },
+  phone: {
+    type: DataTypes.STRING(20),
+    allowNull: false,
+    comment: '联系电话'
+  },
+  purpose: {
+    type: DataTypes.TEXT,
+    allowNull: true,
+    comment: '贷款用途'
+  },
+  remark: {
+    type: DataTypes.TEXT,
+    allowNull: true,
+    comment: '备注'
+  },
+  contractTime: {
+    type: DataTypes.DATE,
+    allowNull: false,
+    defaultValue: DataTypes.NOW,
+    comment: '合同签订时间'
+  },
+  disbursementTime: {
+    type: DataTypes.DATE,
+    allowNull: true,
+    comment: '放款时间'
+  },
+  maturityTime: {
+    type: DataTypes.DATE,
+    allowNull: true,
+    comment: '到期时间'
+  },
+  completedTime: {
+    type: DataTypes.DATE,
+    allowNull: true,
+    comment: '完成时间'
+  },
+  createdBy: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    comment: '创建人ID',
+    references: {
+      model: 'bank_users',
+      key: 'id'
+    }
+  },
+  updatedBy: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    comment: '更新人ID',
+    references: {
+      model: 'bank_users',
+      key: 'id'
+    }
+  }
+}, {
+  sequelize: require('../config/database').sequelize,
+  modelName: 'LoanContract',
+  tableName: 'bank_loan_contracts',
+  timestamps: true,
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt',
+  hooks: {
+    beforeCreate: (contract) => {
+      // 生成合同编号
+      if (!contract.contractNumber) {
+        const now = new Date();
+        const timestamp = now.getFullYear().toString() +
+          (now.getMonth() + 1).toString().padStart(2, '0') +
+          now.getDate().toString().padStart(2, '0') +
+          now.getHours().toString().padStart(2, '0') +
+          now.getMinutes().toString().padStart(2, '0') +
+          now.getSeconds().toString().padStart(2, '0');
+        const random = Math.floor(Math.random() * 1000).toString().padStart(3, '0');
+        contract.contractNumber = 'HT' + timestamp + random;
+      }
+    }
+  }
+});
+
+module.exports = LoanContract;