According to the documentation (http://sequel.rubyforge.org/rdoc-
plugins/classes/Sequel/Plugins/IdentityMap.html) the Identity Map
plugin for Ruby Sequel does not work with rcte_tree?
"The identity_map plugin is not compatible with the eager loading in
the rcte_tree plugin."
Is this true? Because I have found that it seems to work when doing
simple things like this:
a = Thing[1]
b = Thing[2]
a.add_child b
x = Thing[2] # different object?
a.children.include? x # => true
a.children.first.object_id == x.object_id # => true
However, recently I have encountered a serious issue with the design
of a system wherein attempting to get important properties of an
entity retrieved from a tree relationship in my Postgres schema fails
because the properties have been assigned at runtime are not
persistent, so the routines in other threads within the system that
are attempting to access the non-persistent information on those
objects fail because the identity map does not succeed in returning
references to the entity instance already marshaled elsewhere in the
system.
That's a little convoluted, perhaps.
Psuedo-code:
class Thing < RCTETreeEnabledNode
def non_persistent_stuff
@non_persistent_stuff ||= Array.new
end
end
def routine1
a = Thing[1]
b = Thing[2]
c = Thing[3] # Marshals an entity to an Object instance
with .object_id = 2050, let's say.
b.non_persistent_stuff << c
a.add_child c
puts "Parent relationship was previously established." if b.parent
== a
# => Parent relationship was previously established.
end
def routine2
a = Thing[1]
c = Thing[3]) # Shouldn't this return a reference to
Object.object_id = 2050?
puts a.children.include? c # => true
z = a.children.select { |child| child.non_persistent_stuff.include?
c }
puts "Is this a problem? That z is empty?" if z.empty?
end
My guess is that my design is simply wrong, and I should be doing this
another way.
--
You received this message because you are subscribed to the Google Groups
"sequel-talk" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sequel-talk?hl=en.
