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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. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.






2. Negation operator for Q objects.






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






4. To activate your models






5. 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.






6. what the field _______ determines: (1) The database column type (e.g. INTEGER - VARCHAR); (2) The widget to use in Django's admin interface - if you care to use it (e.g. <input type="text"> - <select>); (3) The minimal validation requirements - used






7. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12






8. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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9. 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






10. 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






11. This method immediately deletes the object and has no return value.






12. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.






13. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.






14. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r






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






16. 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)






17. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary






18. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.






19. Returns True if the QuerySet contains any results - and False if not. This tries to perform the query in the simplest and fastest way possible - but it does execute nearly the same query. This means that calling this method on a queryset is faster th






20. These methods are intended to do "table-wide" things.






21. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.






22. Returns a copy of the current QuerySet (or QuerySet subclass you pass in). This can be useful in some situations where you might want to pass in either a model manager or a QuerySet and do further filtering on the result. You can safely call all() on






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






24. If True - the table does not permit duplicate values for this field.






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






27. Lookup type that returns results with a case-sensitive start sequence.






28. 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.






29. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.






30. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.






31. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.






32. (1) These cannot be Python reserved words - because that would result in a Python syntax error. (2) These cannot contain more than one underscore in a row - due to the way Django's query lookup syntax works.






33. 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






34. Keyword shortcut for looking up an object by primary key.






35. Returns the most recent object in the table - by date - using the field_name provided as the date field.






36. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()






37. 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.






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






39. 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.






40. Returns a DateQuerySet -- a QuerySet that evaluates to a list of datetime.datetime objects representing all available dates of a particular kind within the contents of the QuerySet.

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






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






43. This query uses an F object to increment the pingback count for every entry in the blog.

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44. This model method saves a model instance to the database. This method has no return value.






45. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.






46. Takes the ouput of one filter and uses it as input for another filter. This works because a refinement of a QuerySet is itself a QuerySet.






47. Lookup type for date/datetime fields that finds a 'day of the week' match.






48. The default for this is the name of the child class followed by '_set'.






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






50. This gives your model metadata.







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