Mixing
Limit Multiple MongoDB Array Size
I have a document that lists post item ids for an author separated out by topic. This results in a document such as the following:
{
_id: "sdkafjsadkfjads3023",
Author: "SomeGuy"
RecentPosts: {
"topic-1": {
Count: 4,
Posts: ["postitemid1","postitemid2","postitemid2","postitemid3"]
}
"topic-2": {
Count: 3
Posts: ["postitem5","postitem6","postitem8"]
}
}
}
Most of the time I am doing atomic pushes to each of these post arrays in the same update. What I want to do is limit the arrays above to 10 items at all times. This way, anytime I do a pushall to the same topic/posts. Is what I'm asking even possible, or should I do this a different way?
Thanks in advance
mongodb atomic fixed
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
add a comment |
I have a document that lists post item ids for an author separated out by topic. This results in a document such as the following:
{
_id: "sdkafjsadkfjads3023",
Author: "SomeGuy"
RecentPosts: {
"topic-1": {
Count: 4,
Posts: ["postitemid1","postitemid2","postitemid2","postitemid3"]
}
"topic-2": {
Count: 3
Posts: ["postitem5","postitem6","postitem8"]
}
}
}
Most of the time I am doing atomic pushes to each of these post arrays in the same update. What I want to do is limit the arrays above to 10 items at all times. This way, anytime I do a pushall to the same topic/posts. Is what I'm asking even possible, or should I do this a different way?
Thanks in advance
mongodb atomic fixed
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46
add a comment |
I have a document that lists post item ids for an author separated out by topic. This results in a document such as the following:
{
_id: "sdkafjsadkfjads3023",
Author: "SomeGuy"
RecentPosts: {
"topic-1": {
Count: 4,
Posts: ["postitemid1","postitemid2","postitemid2","postitemid3"]
}
"topic-2": {
Count: 3
Posts: ["postitem5","postitem6","postitem8"]
}
}
}
Most of the time I am doing atomic pushes to each of these post arrays in the same update. What I want to do is limit the arrays above to 10 items at all times. This way, anytime I do a pushall to the same topic/posts. Is what I'm asking even possible, or should I do this a different way?
Thanks in advance
mongodb atomic fixed
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
I have a document that lists post item ids for an author separated out by topic. This results in a document such as the following:
{
_id: "sdkafjsadkfjads3023",
Author: "SomeGuy"
RecentPosts: {
"topic-1": {
Count: 4,
Posts: ["postitemid1","postitemid2","postitemid2","postitemid3"]
}
"topic-2": {
Count: 3
Posts: ["postitem5","postitem6","postitem8"]
}
}
}
Most of the time I am doing atomic pushes to each of these post arrays in the same update. What I want to do is limit the arrays above to 10 items at all times. This way, anytime I do a pushall to the same topic/posts. Is what I'm asking even possible, or should I do this a different way?
Thanks in advance
mongodb atomic fixed
mongodb atomic fixed
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
asked Jul 24 '12 at 17:17
nyxtomnyxtom
2,59421924
2,59421924
Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46
add a comment |
Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46
Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46
add a comment |
2 Answers
2
active
oldest
votes
If I understand correctly Capped Collections are what you want.
http://www.mongodb.org/display/DOCS/Capped+Collections
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
add a comment |
As it turns out, this was a longstanding issue in MongoDB that was since added in MongoDB 2.4 release using the $slice operator.
db.students.update(
{ _id: 1 },
{ $push: { scores: { $each : [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 }
],
$sort: { score: 1 },
$slice: -3
}
}
}
)
http://docs.mongodb.org/manual/tutorial/limit-number-of-elements-in-updated-array/
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
If I understand correctly Capped Collections are what you want.
http://www.mongodb.org/display/DOCS/Capped+Collections
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
add a comment |
If I understand correctly Capped Collections are what you want.
http://www.mongodb.org/display/DOCS/Capped+Collections
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
add a comment |
If I understand correctly Capped Collections are what you want.
http://www.mongodb.org/display/DOCS/Capped+Collections
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
If I understand correctly Capped Collections are what you want.
http://www.mongodb.org/display/DOCS/Capped+Collections
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
answered Jul 24 '12 at 22:04
Geert-JanGeert-Jan
10.1k858109
10.1k858109
add a comment |
add a comment |
As it turns out, this was a longstanding issue in MongoDB that was since added in MongoDB 2.4 release using the $slice operator.
db.students.update(
{ _id: 1 },
{ $push: { scores: { $each : [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 }
],
$sort: { score: 1 },
$slice: -3
}
}
}
)
http://docs.mongodb.org/manual/tutorial/limit-number-of-elements-in-updated-array/
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
add a comment |
As it turns out, this was a longstanding issue in MongoDB that was since added in MongoDB 2.4 release using the $slice operator.
db.students.update(
{ _id: 1 },
{ $push: { scores: { $each : [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 }
],
$sort: { score: 1 },
$slice: -3
}
}
}
)
http://docs.mongodb.org/manual/tutorial/limit-number-of-elements-in-updated-array/
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
add a comment |
As it turns out, this was a longstanding issue in MongoDB that was since added in MongoDB 2.4 release using the $slice operator.
db.students.update(
{ _id: 1 },
{ $push: { scores: { $each : [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 }
],
$sort: { score: 1 },
$slice: -3
}
}
}
)
http://docs.mongodb.org/manual/tutorial/limit-number-of-elements-in-updated-array/
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
As it turns out, this was a longstanding issue in MongoDB that was since added in MongoDB 2.4 release using the $slice operator.
db.students.update(
{ _id: 1 },
{ $push: { scores: { $each : [
{ attempt: 3, score: 7 },
{ attempt: 4, score: 4 }
],
$sort: { score: 1 },
$slice: -3
}
}
}
)
http://docs.mongodb.org/manual/tutorial/limit-number-of-elements-in-updated-array/
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
answered Jul 30 '13 at 3:51
nyxtomnyxtom
2,59421924
2,59421924
add a comment |
add a comment |
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Can you give an example of how you are updating the Post arrays?
– William Z
Jul 25 '12 at 20:44
I've decided to simply go with a server-side solution. I pull down the recent posts from the profile and then select the top 10 and save it back to the profile.
– nyxtom
Jul 25 '12 at 23:46