Changes between Version 5 and Version 6 of new_meta_api

Timestamp:

Jul 11, 2014, 5:33:38 AM (10 years ago)

Author:

pirosb3

Comment:

--

new_meta_api

@@ -76 +76 @@
 }}}
 GenericForeignKey uses content_type and object_id to keep track of what model type and id is set by item, but item itself does not have a concrete presence on the database.
-In this case, item is a virtual field. 
+In this case, item is a virtual field.
+
+==== Field options
+There are 5 properties that each field can have:
+
+===== Local
+A local field is one that is defined on the queries model and is not derived from inheritance.
+Fields from models that directly inherit from abstract models or proxy classes are still local 
+
+{{{
+class Person(models.Model):
+  name = models.CharField(max_length=50)
+
+class Londoner(Person):
+  overdraft = models.DecimalField()
+}}}
+
+Londoner has two fields (name and overdraft) but only one local field (overdraft)
+
+===== Hidden
+Hidden fields are only referred to related objects and related m2m. When a relational model (such as ManyToManyField, or ForeignKey) specifies a related_name that starts with a "+", it tells Django to not create a reverse relation.
+{{{
+class City(models.Model):
+    name = models.CharField(max_length=100)
+
+class Person(models.Model):
+    city = models.ForeignKey(City, related_name='+')
+}}}
+
+In this case, City has a related hidden object from Person (as you can't access person_set)