DOC: Update filter tutorial

src/doc/tutorials/complex_data_models.rst

@@ -91,39 +91,42 @@ entities. A short example:
    r = db.Record()
    p1 = db.Property(id=101, name="Property 1")
    p2 = db.Property(id=102, name="Property 2")
-   p3 = db.Property(name="Property")
+   p3_1 = db.Property(id=103, name="Property 3")
+   p3_2 = db.Property(id=103, name="Property 3")
    p4 = db.Property(name="Property")
-   r.add_property(p1).add_property(p2).add_property(p3).add_property(p4)
+   p5 = db.Property(name="Property")
+   r.add_property(p1).add_property(p2).add_property(p3_1)
+   r.add_property(p3_2).add_property(p4).add_property(p5)
    properties = r.properties
 
    # As r only has one property with id 101, this returns a list containing only p1
    properties.filter(pid=101)
    # Result: [p1]
 
-   # Filtering with name="Property" returns both p3 and p4, as they share their name
+   # Filtering with name="Property" returns both p4 and p5, as they share their name
    properties.filter(name="Property")
-   # Result: [p3, p4]
+   # Result: [p4, p5]
 
    # Filtering with name="Property 1" and id=102 returns both p1 and p2, because
    # any property matching either criterion is returned:
    properties.filter(name="Property 1", pid="102")
    # Result: [p1, p2]
 
+   p6 = db.Property(name="Property 2")
+   r.add_property(p6)
    # If we want to find properties matching one specific property, we can also filter using
-   # the entity itself. In this case, only properties matching both name and id are returned:
-   p5 = db.Property(name="Property 2")
-   r.add_property(p5)
-   properties.filter(p5)
-   # Result: [p5]
-   properties.filter(name=p5.name, pid=p5.id)
-   # Result: [p2, p5], because p2 and p5 share a name
-   properties.filter(p3)
-   # Result: [p3, p4], because p3 and p4 share both their name and id
-
-   # However, if you want to retrieve only instances of the property itself, this can be
-   # done using the parameter check_equality, which enforces that all entities in the returned
-   # list are equal to the parameter.
-   properties.filter(p3, check_equality=True)
-   # Result: [p3]
+   # the entity itself. In this case, only properties matching both name and id are returned,
+   # as long as both are set.
+   properties.filter(p2)
+   # Result: [p2]
+   # As p6 does not have an id yet, both candidates matching its name are returned
+   properties.filter(p6)
+   # Result: [p2, p6]
+   # Similarly if we match using name and id parameters, all candidates matching either are returned
+   properties.filter(name=p2.name, pid=p2.id)
+   # Result: [p2, p6], because p2 and p6 share a name
+   # And if both name and id match, there may also be several results when matching an entity
+   properties.filter(p3_1)
+   # Result: [p3_1, p3_2], because they share both their name and id
 
 The filter function of ParentList works analogously.