Querying for a subsequence using Django ArrayFields
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I have an ArrayField that stores sequences of integers in it, for example: Sequences.objects.first().seq returns [5,4,4,3,2,2,1]. The sequences are always stored in decreasing order, and I want to filter Sequences to find a subsequence. However, I'm running into problems when trying to find a subsequence that contains repeated elements and I don't know how to go about solving this problem.
For instance, if I wish to filter for any sequence containing the subsequence q = [5,4,4,4,2], I would try Sequences.objects.filter(seq__contains=q), but this QuerySet will include the sequence [5,4,4,3,2,2,1], since each element of q is individually in the sequence, but not all together. However, I do not want only exact matches. If I filtered by q, I would like to include something like [6,5,5,4,4,4,3,2,1] but reject something like [5,4,4,3,2,2,1] since the former case has all of q with multiplicity, and the latter is missing a 4, and so doesnt contain q as a subsequence.
django postgresql sequence subsequence
asked Nov 11 at 1:39
Sharat Chandra
12
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I have an ArrayField that stores sequences of integers in it, for example: Sequences.objects.first().seq returns [5,4,4,3,2,2,1]. The sequences are always stored in decreasing order, and I want to filter Sequences to find a subsequence. However, I'm running into problems when trying to find a subsequence that contains repeated elements and I don't know how to go about solving this problem.
For instance, if I wish to filter for any sequence containing the subsequence q = [5,4,4,4,2], I would try Sequences.objects.filter(seq__contains=q), but this QuerySet will include the sequence [5,4,4,3,2,2,1], since each element of q is individually in the sequence, but not all together. However, I do not want only exact matches. If I filtered by q, I would like to include something like [6,5,5,4,4,4,3,2,1] but reject something like [5,4,4,3,2,2,1] since the former case has all of q with multiplicity, and the latter is missing a 4, and so doesnt contain q as a subsequence.
django postgresql sequence subsequence
asked Nov 11 at 1:39
Sharat Chandra
12
Did you try usingiexact? i.e.Sequences.objecst.filter(seq__iexact=q)
– nara_l
Nov 11 at 2:46
Thanks for asking! I don't want to useiexactand have clarified the question some.
– Sharat Chandra
Nov 11 at 3:00
add a comment |
up vote
0
down vote
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up vote
0
down vote
favorite
I have an ArrayField that stores sequences of integers in it, for example: Sequences.objects.first().seq returns [5,4,4,3,2,2,1]. The sequences are always stored in decreasing order, and I want to filter Sequences to find a subsequence. However, I'm running into problems when trying to find a subsequence that contains repeated elements and I don't know how to go about solving this problem.
For instance, if I wish to filter for any sequence containing the subsequence q = [5,4,4,4,2], I would try Sequences.objects.filter(seq__contains=q), but this QuerySet will include the sequence [5,4,4,3,2,2,1], since each element of q is individually in the sequence, but not all together. However, I do not want only exact matches. If I filtered by q, I would like to include something like [6,5,5,4,4,4,3,2,1] but reject something like [5,4,4,3,2,2,1] since the former case has all of q with multiplicity, and the latter is missing a 4, and so doesnt contain q as a subsequence.
django postgresql sequence subsequence
asked Nov 11 at 1:39
Sharat Chandra
12
I have an ArrayField that stores sequences of integers in it, for example: Sequences.objects.first().seq returns [5,4,4,3,2,2,1]. The sequences are always stored in decreasing order, and I want to filter Sequences to find a subsequence. However, I'm running into problems when trying to find a subsequence that contains repeated elements and I don't know how to go about solving this problem.
For instance, if I wish to filter for any sequence containing the subsequence q = [5,4,4,4,2], I would try Sequences.objects.filter(seq__contains=q), but this QuerySet will include the sequence [5,4,4,3,2,2,1], since each element of q is individually in the sequence, but not all together. However, I do not want only exact matches. If I filtered by q, I would like to include something like [6,5,5,4,4,4,3,2,1] but reject something like [5,4,4,3,2,2,1] since the former case has all of q with multiplicity, and the latter is missing a 4, and so doesnt contain q as a subsequence.
django postgresql sequence subsequence
django postgresql sequence subsequence
asked Nov 11 at 1:39
Sharat Chandra
12
asked Nov 11 at 1:39
Sharat Chandra
12
edited Nov 11 at 2:59
asked Nov 11 at 1:39
Sharat Chandra
12
asked Nov 11 at 1:39
Sharat Chandra
12
asked Nov 11 at 1:39
Sharat Chandra
12
12
Did you try usingiexact? i.e.Sequences.objecst.filter(seq__iexact=q)
– nara_l
Nov 11 at 2:46
Thanks for asking! I don't want to useiexactand have clarified the question some.
– Sharat Chandra
Nov 11 at 3:00
add a comment |
Did you try usingiexact? i.e.Sequences.objecst.filter(seq__iexact=q)
– nara_l
Nov 11 at 2:46
Thanks for asking! I don't want to useiexactand have clarified the question some.
– Sharat Chandra
Nov 11 at 3:00
Did you try using
iexact? i.e. Sequences.objecst.filter(seq__iexact=q)– nara_l
Nov 11 at 2:46
Did you try using
iexact? i.e. Sequences.objecst.filter(seq__iexact=q)– nara_l
Nov 11 at 2:46
Thanks for asking! I don't want to use
iexact and have clarified the question some.– Sharat Chandra
Nov 11 at 3:00
Thanks for asking! I don't want to use
iexact and have clarified the question some.– Sharat Chandra
Nov 11 at 3:00
add a comment |
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Did you try using
iexact? i.e.Sequences.objecst.filter(seq__iexact=q)– nara_l
Nov 11 at 2:46
Thanks for asking! I don't want to use
iexactand have clarified the question some.– Sharat Chandra
Nov 11 at 3:00