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				+'use strict'; 
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				+ 
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				+/** @type {import('sequelize-cli').Migration} */ 
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				+module.exports = { 
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				+  async up (queryInterface, Sequelize) { 
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				+    // 检查并添加缺失的字段到Articles表 
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				+    const tableDescription = await queryInterface.describeTable('Articles'); 
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				+     
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				+    if (!tableDescription.author) { 
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				+      await queryInterface.addColumn('Articles', 'author', { 
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				+        type: Sequelize.TEXT, 
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				+        allowNull: true, 
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				+      }); 
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				+    } 
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				+ 
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				+    if (!tableDescription.category) { 
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				+      await queryInterface.addColumn('Articles', 'category', { 
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				+        type: Sequelize.INTEGER, 
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				+        allowNull: true, 
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				+      }); 
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				+    } 
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				+ 
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				+    if (!tableDescription.crop) { 
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				+      await queryInterface.addColumn('Articles', 'crop', { 
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				+        type: Sequelize.INTEGER, 
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				+        allowNull: true, 
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				+      }); 
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				+    } 
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				+ 
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				+    if (!tableDescription.seoKeyword) { 
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				+      await queryInterface.addColumn('Articles', 'seoKeyword', { 
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				+        type: Sequelize.TEXT, 
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				+        allowNull: true, 
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				+      }); 
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				+    } 
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				+ 
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				+    if (!tableDescription.seoDescription) { 
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				+      await queryInterface.addColumn('Articles', 'seoDescription', { 
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				+        type: Sequelize.TEXT, 
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				+        allowNull: true, 
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				+      }); 
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				+    } 
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				+  }, 
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				+ 
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				+  async down (queryInterface, Sequelize) { 
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				+    // 删除添加的字段 
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				+    await queryInterface.removeColumn('Articles', 'author'); 
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				+    await queryInterface.removeColumn('Articles', 'category'); 
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				+    await queryInterface.removeColumn('Articles', 'crop'); 
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				+    await queryInterface.removeColumn('Articles', 'seoKeyword'); 
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				+    await queryInterface.removeColumn('Articles', 'seoDescription'); 
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				+  } 
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				+}; 
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