Question

我有一个类似于Traceback (most recent call last): File "manage.py", line 22, in <module> execute_from_command_line(sys.argv) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line utility.execute() File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/core/management/__init__.py", line 356, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/core/management/base.py", line 283, in run_from_argv self.execute(*args, **cmd_options) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/core/management/base.py", line 330, in execute output = self.handle(*args, **options) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/core/management/commands/migrate.py", line 204, in handle fake_initial=fake_initial, File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/migrations/executor.py", line 115, in migrate state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/migrations/executor.py", line 244, in apply_migration state = migration.apply(state, schema_editor) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/migrations/migration.py", line 129, in apply operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/migrations/operations/fields.py", line 156, in database_forwards schema_editor.remove_field(from_model, from_model._meta.get_field(self.name)) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/sqlite3/schema.py", line 256, in remove_field self._remake_table(model, delete_field=field) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/sqlite3/schema.py", line 206, in _remake_table self.quote_name(model._meta.db_table), File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 120, in execute cursor.execute(sql, params) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/utils.py", line 79, in execute return super(CursorDebugWrapper, self).execute(sql, params) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/utils.py", line 94, in __exit__ six.reraise(dj_exc_type, dj_exc_value, traceback) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/utils/six.py", line 685, in reraise raise value.with_traceback(tb) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/Users/zorgan/Desktop/app/lib/python3.5/site-packages/django/db/backends/sqlite3/base.py", line 328, in execute return Database.Cursor.execute(self, query, params) django.db.utils.IntegrityError: datatype mismatch的架构，并且使用sequalize，我想使用product: { ... ,ratings: [ {rating: 3} ] }添加属性product.avg_rating。

这是我的代码：

sequelize

但我一直收到错误：

在没有GROUP BY的聚合查询中，SELECT列表的表达式＃1 包含nonaggregated column＆＃39; text_rewriter.languageCombination.id＆＃39 ;; 这与sql_mode = only_full_group_by
不兼容

目标输出：

sequelize.models.product.findAll({
    include: [{
       model: sequelize.models.rating,
       as: 'ratings', 
       attributes:  {
        include: ['rating',[sequelize.fn('AVG', 'ratings.rating'), 'avg_rating']]
       },
       group: ['rating.rating'],//also tried ratings.rating, and just rating
    }],
 }).then(products=>{...})

我缺少什么想法？我见过很多例子，但没有一个像我发现的那样使用包括。

Answer 1

sequelize.models.product.findAll({
include: [{
   model: sequelize.models.rating,
   as: 'ratings', 
   attributes:  ['avg_rating'] //this is column name here
}],
}).then(products=>{...})

这将返回： -

products: [
 {product: 'product name',
 ratings: [...],
 rating : { //here all the attributes you wanted, in this case only 'avg_rating' }
 },
 {...}
]

但是在使用它之前，你必须在产品表和评级表之间定义关系。

表：产品有id，名称

表：评级有id，rating，product_id

在上述情况下，关系将是'rating.belongsTo（product）OR product.hasMay（rating）'

Answer 2

MySQL实现对功能依赖性的检测。如果启用了ONLY_FULL_GROUP_BY SQL模式（默认情况下是默认模式），MySQL将拒绝选择列表，HAVING条件或ORDER BY列表所引用的非聚合列的查询在GROUP BY子句中命名的功能在功能上也不依赖于它们。

该错误与sql_mode有关，您需要在数据库控制台上执行以下命令。

SET GLOBAL sql_mode = '';

sequelize - 获得包含模型的AVG

2 个答案: