fix(query-generator): fix addColumn create comment

lib/dialects/mssql/query-generator.js

@@ -110,12 +110,7 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
     const query = (table, attrs) => `IF OBJECT_ID('${table}', 'U') IS NULL CREATE TABLE ${table} (${attrs})`,
       primaryKeys = [],
       foreignKeys = {},
-      attrStr = [],
-      commentTemplate = (comment, table, column) => ' EXEC sp_addextendedproperty ' +
-        `@name = N\'MS_Description\', @value = ${comment}, ` +
-        '@level0type = N\'Schema\', @level0name = \'dbo\', ' +
-        `@level1type = N\'Table\', @level1name = ${table}, ` +
-        `@level2type = N\'Column\', @level2name = ${column};`;
+      attrStr = [];
 
     let commentStr = '';
 
@@ -127,7 +122,7 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
         if (dataType.includes('COMMENT ')) {
           const commentMatch = dataType.match(/^(.+) (COMMENT.*)$/);
           const commentText = commentMatch[2].replace('COMMENT', '').trim();
-          commentStr += commentTemplate(this.escape(commentText), this.quoteIdentifier(tableName), this.quoteIdentifier(attr));
+          commentStr += this.commentTemplate(commentText, tableName, attr);
           // remove comment related substring from dataType
           dataType = commentMatch[1];
         }
@@ -239,11 +234,28 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
     // FIXME: attributeToSQL SHOULD be using attributes in addColumnQuery
     //        but instead we need to pass the key along as the field here
     dataType.field = key;
+    let commentStr = '';
+
+    if (dataType.comment && _.isString(dataType.comment)) {
+      commentStr = this.commentTemplate(dataType.comment, table, key);
+      // attributeToSQL will try to include `COMMENT 'Comment Text'` when it returns if the comment key
+      // is present. This is needed for createTable statement where that part is extracted with regex.
+      // Here we can intercept the object and remove comment property since we have the original object.
+      delete dataType['comment'];
+    }
 
     const def = this.attributeToSQL(dataType, {
       context: 'addColumn'
     });
-    return `ALTER TABLE ${this.quoteTable(table)} ADD ${this.quoteIdentifier(key)} ${def};`;
+    return `ALTER TABLE ${this.quoteTable(table)} ADD ${this.quoteIdentifier(key)} ${def};${commentStr}`;
+  }
+
+  commentTemplate(comment, table, column) {
+    return ' EXEC sp_addextendedproperty ' +
+        `@name = N\'MS_Description\', @value = ${this.escape(comment)}, ` +
+        '@level0type = N\'Schema\', @level0name = \'dbo\', ' +
+        `@level1type = N\'Table\', @level1name = ${this.quoteIdentifier(table)}, ` +
+        `@level2type = N\'Column\', @level2name = ${this.quoteIdentifier(column)};`;
   }
 
   removeColumnQuery(tableName, attributeName) {

lib/dialects/postgres/query-generator.js

@@ -244,7 +244,7 @@ class PostgresQueryGenerator extends AbstractQueryGenerator {
 
   addColumnQuery(table, key, dataType) {
 
-    const dbDataType = this.attributeToSQL(dataType, { context: 'addColumn' });
+    const dbDataType = this.attributeToSQL(dataType, { context: 'addColumn', table, key });
     const definition = this.dataTypeMapping(table, key, dbDataType);
     const quotedKey = this.quoteIdentifier(key);
     const quotedTable = this.quoteTable(this.extractTableDetails(table));
@@ -452,7 +452,7 @@ class PostgresQueryGenerator extends AbstractQueryGenerator {
     return fragment;
   }
 
-  attributeToSQL(attribute) {
+  attributeToSQL(attribute, option) {
     if (!_.isPlainObject(attribute)) {
       attribute = {
         type: attribute
@@ -535,7 +535,13 @@ class PostgresQueryGenerator extends AbstractQueryGenerator {
     }
 
     if (attribute.comment && _.isString(attribute.comment)) {
-      sql += ` COMMENT ${attribute.comment}`;
+      if (option && option.context === 'addColumn') {
+        const quotedAttr = this.quoteIdentifier(option.key);
+        const escapedCommentText = this.escape(attribute.comment);
+        sql += `; COMMENT ON COLUMN ${this.quoteTable(option.table)}.${quotedAttr} IS ${escapedCommentText}`;
+      } else {
+        sql += ` COMMENT ${attribute.comment}`;
+      }
     }
 
     return sql;

test/unit/dialects/mssql/query-generator.test.js

@@ -193,6 +193,22 @@ if (current.dialect.name === 'mssql') {
       });
     });
 
+    it('addColumnQuery', function() {
+      expectsql(this.queryGenerator.addColumnQuery('myTable', 'myColumn', { type: 'VARCHAR(255)' }), {
+        mssql: 'ALTER TABLE [myTable] ADD [myColumn] VARCHAR(255) NULL;'
+      });
+    });
+
+    it('addColumnQuery with comment', function() {
+      expectsql(this.queryGenerator.addColumnQuery('myTable', 'myColumn', { type: 'VARCHAR(255)', comment: 'This is a comment' }), {
+        mssql: 'ALTER TABLE [myTable] ADD [myColumn] VARCHAR(255) NULL; EXEC sp_addextendedproperty ' +
+        '@name = N\'MS_Description\', @value = N\'This is a comment\', ' +
+        '@level0type = N\'Schema\', @level0name = \'dbo\', ' +
+        '@level1type = N\'Table\', @level1name = [myTable], ' +
+        '@level2type = N\'Column\', @level2name = [myColumn];'
+      });
+    });
+
     it('removeColumnQuery', function() {
       expectsql(this.queryGenerator.removeColumnQuery('myTable', 'myColumn'), {
         mssql: 'ALTER TABLE [myTable] DROP COLUMN [myColumn];'

test/unit/dialects/postgres/query-generator.test.js

@@ -124,7 +124,10 @@ if (dialect.startsWith('postgres')) {
           arguments: [{id: {type: 'INTEGER', unique: true, comment: 'This is my comment'}}],
           expectation: {id: 'INTEGER UNIQUE COMMENT This is my comment'}
         },
-
+        {
+          arguments: [{id: {type: 'INTEGER', unique: true, comment: 'This is my comment'}}, {context: 'addColumn', key: 'column', table: {schema: 'foo', tableName: 'bar'}}],
+          expectation: {id: 'INTEGER UNIQUE; COMMENT ON COLUMN "foo"."bar"."column" IS \'This is my comment\''}
+        },
         // New references style
         {
           arguments: [{id: {type: 'INTEGER', references: { model: 'Bar' }}}],

test/unit/sql/add-column.test.js

@@ -50,6 +50,15 @@ if (current.dialect.name === 'mysql') {
           mysql: 'ALTER TABLE `users` ADD `test_added_col_first` VARCHAR(255) FIRST;'
         });
       });
+
+      it('properly generates alter queries with column level comment', () => {
+        return expectsql(sql.addColumnQuery(Model.getTableName(), 'column_with_comment', current.normalizeAttribute({
+          type: DataTypes.STRING,
+          comment: 'This is a comment'
+        })), {
+          mysql: 'ALTER TABLE `users` ADD `column_with_comment` VARCHAR(255) COMMENT \'This is a comment\';'
+        });
+      });
     });
   });
 }