What could cause activerecord sum to return the wrong value?
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I am getting an odd result from an activerecord query, and I cannot figure out why.
parent.children
=> #<ActiveRecord::AssociationRelation[#<Child id: 1, date: "2018-01-01", quantity: 10>]>
parent.children.size
=> 1
parent.children.group(:date).count
=> Mon, 01 Jan 2018=>1
parent.children.group(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>20
What could cause sum to return 20?
As you can see, there is only one record, and the value being summed is 10. sum should return 10.
In fact, calling the Child model directly returns the correct result.
Child(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>10
Even more confusing, this particular method is in a concern that is shared between several models. Elsewhere it calculates the correct sum. Only one model is returning this odd result.
Scratching my head how to debug this, it really doesn't seem to make sense. How is it possible for sum to return a value greater than expected?
ruby-on-rails activerecord
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
add a comment |
I am getting an odd result from an activerecord query, and I cannot figure out why.
parent.children
=> #<ActiveRecord::AssociationRelation[#<Child id: 1, date: "2018-01-01", quantity: 10>]>
parent.children.size
=> 1
parent.children.group(:date).count
=> Mon, 01 Jan 2018=>1
parent.children.group(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>20
What could cause sum to return 20?
As you can see, there is only one record, and the value being summed is 10. sum should return 10.
In fact, calling the Child model directly returns the correct result.
Child(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>10
Even more confusing, this particular method is in a concern that is shared between several models. Elsewhere it calculates the correct sum. Only one model is returning this odd result.
Scratching my head how to debug this, it really doesn't seem to make sense. How is it possible for sum to return a value greater than expected?
ruby-on-rails activerecord
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
2
BTW it seems thegroupclause break something. So you can start experimenting on the result ofparent.children.group(:date).to_sql.
– Marek Lipka
Nov 15 '18 at 10:10
add a comment |
I am getting an odd result from an activerecord query, and I cannot figure out why.
parent.children
=> #<ActiveRecord::AssociationRelation[#<Child id: 1, date: "2018-01-01", quantity: 10>]>
parent.children.size
=> 1
parent.children.group(:date).count
=> Mon, 01 Jan 2018=>1
parent.children.group(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>20
What could cause sum to return 20?
As you can see, there is only one record, and the value being summed is 10. sum should return 10.
In fact, calling the Child model directly returns the correct result.
Child(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>10
Even more confusing, this particular method is in a concern that is shared between several models. Elsewhere it calculates the correct sum. Only one model is returning this odd result.
Scratching my head how to debug this, it really doesn't seem to make sense. How is it possible for sum to return a value greater than expected?
ruby-on-rails activerecord
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
I am getting an odd result from an activerecord query, and I cannot figure out why.
parent.children
=> #<ActiveRecord::AssociationRelation[#<Child id: 1, date: "2018-01-01", quantity: 10>]>
parent.children.size
=> 1
parent.children.group(:date).count
=> Mon, 01 Jan 2018=>1
parent.children.group(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>20
What could cause sum to return 20?
As you can see, there is only one record, and the value being summed is 10. sum should return 10.
In fact, calling the Child model directly returns the correct result.
Child(:date).sum(:quantity)
=> Mon, 01 Jan 2018=>10
Even more confusing, this particular method is in a concern that is shared between several models. Elsewhere it calculates the correct sum. Only one model is returning this odd result.
Scratching my head how to debug this, it really doesn't seem to make sense. How is it possible for sum to return a value greater than expected?
ruby-on-rails activerecord
ruby-on-rails activerecord
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
edited Nov 15 '18 at 10:00
Andy Harvey
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
asked Nov 15 '18 at 9:52
Andy HarveyAndy Harvey
5,4151158136
5,4151158136
I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
2
BTW it seems thegroupclause break something. So you can start experimenting on the result ofparent.children.group(:date).to_sql.
– Marek Lipka
Nov 15 '18 at 10:10
add a comment |
I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
2
BTW it seems thegroupclause break something. So you can start experimenting on the result ofparent.children.group(:date).to_sql.
– Marek Lipka
Nov 15 '18 at 10:10
I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
2
2
BTW it seems the
group clause break something. So you can start experimenting on the result of parent.children.group(:date).to_sql.– Marek Lipka
Nov 15 '18 at 10:10
BTW it seems the
group clause break something. So you can start experimenting on the result of parent.children.group(:date).to_sql.– Marek Lipka
Nov 15 '18 at 10:10
add a comment |
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I would experiment in your DB if I were you.
– Marek Lipka
Nov 15 '18 at 9:58
Thanks @MarekLipka. experiment how?
– Andy Harvey
Nov 15 '18 at 10:01
Well first of all, check what SQL query is being generated by your code (the one that works weird). Then copy this query into DB console and check what happens.
– Marek Lipka
Nov 15 '18 at 10:07
2
BTW it seems the
groupclause break something. So you can start experimenting on the result ofparent.children.group(:date).to_sql.– Marek Lipka
Nov 15 '18 at 10:10