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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Lookup type that yields an "exact" match. If you don't provide a lookup type -- that is - if your keyword argument doesn't contain a double underscore -- the lookup type is assumed to be of this sort.






2. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.






3. This query finds all entries with an id in the list [1 - 3 - 4]






4. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea






5. If this option is True - Django will store empty values as NULL in the database. Default is False.






6. Accomplish this by using the field name of related fields across models - separated by double underscores - until you get to the field you want. For example - to get all Entry objects with a Blog whose name is 'Beatles Blog': Entry.objects.filter(blo






7. A convenience method for constructing an object and saving it all in one step.






8. In some complex data-modeling situations - your models might contain a lot of fields - some of which could contain a lot of data (for example - text fields) - or require expensive processing to convert them to Python objects. If you are using the res






9. These add custom "row-level" functionality to your objects. These act on a particular model instance.






10. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.






11. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






12. The database that will be used if this query is executed now






13. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






14. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.






15. Defines a many-to-one relationship. ou use it just like any other Field type: by including it as a class attribute of your model.






16. Returns the object matching the given lookup parameters






17. Lookup type that finds a case-sensitive regular expression match.






18. Lookup type that returns results with a case-insensitive start sequence.






19. This represents a collection of objects from your database. It can have zero - one or many filters.






20. If this option is True - the field is allowed to be blank. Default is False.






21. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






22. These are "anything that's not a field" - such as ordering options (ordering) - database table name (db_table) - or human-readable singular and plural names (verbose_name and verbose_name_plural)






23. Defined by django.db.models.ForeignKey. You use it just like any other Field type: by including it as a class attribute of your model.






24. A QuerySet is iterable - and it executes its database query the first time you iterate over it.






25. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






26. a QuerySet can be sliced - using Python's array-slicing syntax.






27. This is a criterion that narrow down a QuerySet based on given parameters.






28. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .






29. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.






30. Lookup type that returns results in a given list.






31. Returns a new QuerySet containing objects that match the given lookup parameters.






32. Can be used to remove all many-to-many relationships for an instance






33. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.






34. A Python "magic method" that returns a unicode "representation" of any object.






35. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.






36. This field is added automatically - but this behavior can be overridden






37. Lookup type that finds a case-insensitive regular expression match.






38. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.






39. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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40. Lookup type that returns results greater than a given value.






41. If True - this field is the primary key for the model.






42. This query deletes all Entry objects with a pub_date year of 2005.






43. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o






44. Fields are specified by these






45. Lookup type that returns results with a case-sensitive end sequence.






46. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.






47. This sets a field to a particular value for all the objects in a QuerySet. You can only set non-relation fields and ForeignKey fields using this method.






48. To activate your models






49. Lookup type that yields a case-insensitive match.






50. Exception raised by get(**kwargs) if no items match the query.







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