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Changes between Version 84 and Version 85 of BackwardsIncompatibleChanges


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Timestamp:
04/09/07 06:33:53 (7 years ago)
Author:
russellm
Comment:

Added note about removal of LazyDate

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  • BackwardsIncompatibleChanges

    v84 v85  
    1818 
    1919 * March 31, 2007: [http://code.djangoproject.com/wiki/BackwardsIncompatibleChanges#Changedspacelesstemplatetagtoremoveallspaces Changed 'spaceless' template tag to remove all spaces] 
    20  * April 8, 2007: Renamed `localflavor.usa` to `localflavor.us`.  
     20 * April 8, 2007: [http://code.djangoproject.com/wiki/BackwardsIncompatibleChanges#Renamedlocalflavor.usatolocalflavor.us Renamed `localflavour.usa` to `localflavor.us`] 
     21 * April 9, 2007: [http://code.djangoproject.com/wiki/BackwardsIncompatibleChanges#RemovedLazyDate Removed `LazyDate`] 
     22 
    2123 
    2224== Database constraint names changed == 
     
    8284 
    8385As always, {{{spaceless}}} only affects space *between* HTML tags, not space within HTML tags or space in plain text. 
     86 
     87== Renamed `localflavor.usa` to `localflavor.us` == 
     88 
     89As of [4954], `localflavor.usa` has been renamed `localflavor.us`. This change was made to match the naming scheme of other local flavors.  
     90 
     91== Removed `LazyDate` == 
     92 
     93The `LazyDate` helper class was removed in [4985]. Default field values and query arguments can both be callable objects, so instances of `LazyDate` can be replaced with a reference to a callable that evaluates to the current date (i.e., `datetime.now`). For example, the following model using `LazyDate`: 
     94 
     95{{{ 
     96class Article(models.Model): 
     97    title = models.CharField(maxlength=100) 
     98    published = models.DateField(default=LazyDate()) 
     99}}} 
     100 
     101can be redefined as: 
     102 
     103{{{ 
     104from datetime import datetime 
     105class Article(models.Model): 
     106    title = models.CharField(maxlength=100) 
     107    published = models.DateField(default=datetime.now) 
     108}}} 
     109 
     110Note that the new model definition refers to the name of the `datetime.now()` function, but doesn't actually call the function. The call to `datetime.now()` is deferred until the value is actually required (i.e., when the model is saved).