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duplicate join clause when using scan() + count(), find() + count() is normal

Cirooo opened this issue · comments

commented

Description

        var count int64
	var tempList []int
	test := global.GetTransaction().Table(e.TableName() + " as sr").Joins("left join table_s_m sm on sr.s_id = sm.s_id ")
	err2 := test.Distinct("sr.s_id ").Order("sr.s_id desc").Offset((current - 1) * pageSize).Limit(pageSize).Find(&tempList).Offset(-1).Limit(-1).Count(&count).Error

In the example above, it is Find(), and it's normal, but it fails if I replace it with Scan() and it would be this SQL statement:
SELECT COUNT(DISTINCT(sr.s_id)) FROM table_s_r as sr left join table_s_m sm on sr.s_id= sm.s_id left join table_s_m sm on sr.s_id= sm.s_id
And you can notice that there's a duplicate 'left join' in it.
Then mysql throws an error: [1066] [42000]: Not unique table/alias: 'sm'

commented

The issue has been automatically marked as stale as it missing playground pull request link, which is important to help others understand your issue effectively and make sure the issue hasn't been fixed on latest master, checkout https://github.com/go-gorm/playground for details. it will be closed in 30 days if no further activity occurs. if you are asking question, please use the Question template, most likely your question already answered https://github.com/go-gorm/gorm/issues or described in the document https://gorm.io ✨ Search Before Asking ✨

commented

yeah i also started facing this same issue after upgrading gorm, it used to work fine before.
I am not sure why it's happening but (find + count) works fine while (scan + count) don't.
here are my package versions (if of any help):-
gorm.io/driver/postgres v1.5.6
gorm.io/gorm v1.25.11

commented

The issue has been automatically marked as stale as it missing playground pull request link, which is important to help others understand your issue effectively and make sure the issue hasn't been fixed on latest master, checkout https://github.com/go-gorm/playground for details. it will be closed in 30 days if no further activity occurs. if you are asking question, please use the Question template, most likely your question already answered https://github.com/go-gorm/gorm/issues or described in the document https://gorm.io ✨ Search Before Asking ✨