Re: [Django] #25787: Existence checks for related database sets

[Django]

#25787: Existence checks for related database sets
-+-
 Reporter:  JustusAdam   |Owner:
 |  andersonresende
 Type:  New feature  |   Status:  assigned
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  ManyToMany,  | Triage Stage:
  contains, in   |  Unreviewed
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  1|UI/UX:  0
-+-
Changes (by andersonresende):

 * owner:  nobody => andersonresende
 * needs_better_patch:   => 0
 * status:  new => assigned
 * needs_tests:   => 0
 * needs_docs:   => 0


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Ticket URL: 
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[Django] #25787: Existence checks for related database sets

[Django]

#25787: Existence checks for related database sets
-+-
 Reporter:  JustusAdam   |  Owner:  nobody
 Type:  New feature  | Status:  new
Component:  Database layer   |Version:  1.8
  (models, ORM)  |   Keywords:  ManyToMany, contains,
 Severity:  Normal   |  in
 Triage Stage:  Unreviewed   |  Has patch:  0
Easy pickings:  1|  UI/UX:  0
-+-
 I have recently had to check for presence of a particular object in a set
 of related objects (either ManyToMany or ForeignKey) and I found it
 unnecessary cumbersome not to be able to use the
 {{{in}}} operator.

 I propose to add an implementation of the {{{__contains__}}} method to the
 {{{ManyRelatedManager}}} object which executes something like the
 following query:

 {{{
 def __contains__(self, obj):
 return self.filter(id=obj.id).exists()
 }}}

 which would enable the following sample behaviour:

 {{{
 my_student = request.user.student
 my_course = Course.objects.get(id=course_id)
 is_teacher = my_student in my_course.teachers
 }}}

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Ticket URL: 
Django 
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