# Polymorphic parent/child relationships
**URL:** https://discuss.elastic.co/t/polymorphic-parent-child-relationships/6961
**Category:** Elasticsearch
**Created:** [March 9, 2012, 2:59pm UTC](https://discuss.elastic.co/t/polymorphic-parent-child-relationships/6961 "2012-03-09T14:59:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@domizio](https://discuss.elastic.co/u/domizio)
#### Post date: [March 9, 2012, 2:59pm UTC](https://discuss.elastic.co/t/polymorphic-parent-child-relationships/6961/1 "2012-03-09T14:59:31Z")
Hi,
I am working on an app that has a few polymorphic associations. For
example:
Comment may be child of Blog or Review, so when I search in the
comment type I would like to get the parent document of the query run
against the comment.content, that may be a blog or a review.
I see that the mapping ties the child to a fixed parent type, so that
doesn't seem to be possible at this time. I am missing something? Is
there any way to achieve that?
I would like to be able to index the child documents as:
curl -XPUT localhost:9200/app\_index/comment/1001?
parent\_type=blog&parent\_id=1111 -d '
{
"content" : "this blog rocks"
}
'
curl -XPUT localhost:9200/app\_index/comment/1002?
parent\_type=review&parent\_id=2222 -d '
{
"content" : "this review is fair"
}
'
In practice what I would like ES to have is the possibility to link a
child to any type of parent, explicitly, when the child is indexed. Is
that possible? Will it be possible? 🙂
---
### Author:  [@kimchy](https://discuss.elastic.co/u/kimchy)
#### Post date: [March 9, 2012, 7:10pm UTC](https://discuss.elastic.co/t/polymorphic-parent-child-relationships/6961/2 "2012-03-09T19:10:09Z")
No, its not possible and the mapping from a child _type_ is constant to a parent type.
On Friday, March 9, 2012 at 4:59 PM, Domizio Demichelis wrote:
> Hi,
> I am working on an app that has a few polymorphic associations. For
> example:
>
> Comment may be child of Blog or Review, so when I search in the
> comment type I would like to get the parent document of the query run
> against the comment.content, that may be a blog or a review.
>
> I see that the mapping ties the child to a fixed parent type, so that
> doesn't seem to be possible at this time. I am missing something? Is
> there any way to achieve that?
>
> I would like to be able to index the child documents as:
>
> curl -XPUT localhost:9200/app\_index/comment/1001?
> parent\_type=blog&parent\_id=1111 -d '
> {
> "content" : "this blog rocks"
> }
> '
>
> curl -XPUT localhost:9200/app\_index/comment/1002?
> parent\_type=review&parent\_id=2222 -d '
> {
> "content" : "this review is fair"
> }
> '
>
> In practice what I would like ES to have is the possibility to link a
> child to any type of parent, explicitly, when the child is indexed. Is
> that possible? Will it be possible? 🙂
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 3:36am UTC](https://discuss.elastic.co/t/polymorphic-parent-child-relationships/6961/3 "2017-07-06T03:36:30Z")