During saving the associated method gets called and its result written to the database. 1.3 Basic usage Simply derive your model from ComputedFieldsModel and place decorator on a method: from django.db import models from computedfields.models import ComputedFieldsModel, computed class Person(ComputedFieldsModel): forename = models.charfield(max_length=32) surname = depends=]]) def combined(self): return u'%s, %s' % (self.surname, self.forename) combined will be turned into a real database field and can be accessed and searched like any other database field. This is further restricted by certain database adapters.
#SUITECRM LOGIC HOOKS LOCATIONS UPDATE#
Note that taking a rather high value here might penalize update performance due high memory usage on Python side to hold the row instances and construct the final SQL command. Internally the updates are done by a bulk_update on a computed fields model for all affected rows and computed fields. 1Ħ COMPUTEDFIELDS_BATCHSIZE Set the batch size used for computed field updates by the auto resolver (default 100). This comes with the drawback, that the underlying graph cannot linearize and optimize the update paths anymore.
For more complicated setups (like tree structures) you can disable the recursion check.
Therefore the dependency resolver raises a CycleNodeException if a cycle was encountered. COMPUTEDFIELDS_ALLOW_RECURSION Normally cycling updates to the same model field indicate an error in database design. COMPUTEDFIELDS_ADMIN Set this to True to get a listing of ComputedFieldsModel models with their field dependencies in admin. If set, the file must be recreated after model changes to get used by the resolver. This should always be used in production mode in multi process environments to avoid the expensive map creation on every process launch. To create the pickled resolver map point this setting to a writeable path and call the management command createmap.
#SUITECRM LOGIC HOOKS LOCATIONS INSTALL#
For graph rendering also install graphviz: $ pip install graphviz 1.2 Settings The module respects optional settings in settings.py: COMPUTEDFIELDS_MAP Used to set a file path for the pickled resolver map. 1.1 Installation Install the package with pip: $ pip install django-computedfields and add computedfields to your INSTALLED_APPS. 1 django-computedfields Documentation Release netzkolchose Jul 17, 2020ģ Contents: 1 User Guide Installation Settings Basic usage Automatic Updates Custom save method How does it work internally? Advanced Usage Model Inheritance Support Management Commands General Usage Notes Fixtures Migrations Motivation Changelog Examples Dependency Examples Multi Table Inheritance Forced Update of Computed Fields Optimization Examples API Reference models.py resolver.py graph.py handlers.py admin.py Indices and tables 45 Python Module Index 47 Index 49 iĥ CHAPTER 1 User Guide django-computedfields provides autoupdated database fields for model methods.