I'm developing Merb application using DM 0.9.6 gems. I'm observing
that whatever query I use, IdentityMap is not working and the same SQL
queries are repeated all over the time.
Even simple <model>.get(<id>) leads to repetitive SQL queries:
Person.get('0389acd2-c151-4e00-9f29-4143685342f5')
~ SELECT "id" FROM "people" WHERE ("id" = '0389acd2-
c151-4e00-9f29-4143685342f5') ORDER BY "id" LIMIT 1
#==>#<Person id="0389acd2-c151-4e00-9f29-4143685342f5">
Person.get('0389acd2-c151-4e00-9f29-4143685342f5')
~ SELECT "id" FROM "people" WHERE ("id" = '0389acd2-
c151-4e00-9f29-4143685342f5') ORDER BY "id" LIMIT 1
#==>#<Person id="0389acd2-c151-4e00-9f29-4143685342f5">
This is what I get after running any sort of queries:
Person.repository.identity_map(Person)
#==>#<DataMapper::IdentityMap:0x2772ef8 @second_level_cache=nil,
@cache={}>
Could anybody tell me whether this is a bug, a feature, or
misconfiguration in my environment? I really hope to have IdentityMap
running as intended with the ability to specify second level cache
such as memcached buckets.
Definitions:
class Person
include DataMapper::Resource
property :id, DataMapper::Types::UUID, :key => true, :nullable =>
false
end
require 'uuidtools'
module DataMapper
module Types
class UUID < DataMapper::Type
primitive String
# DON'T USE unique(true)! This causes stupid queries like:
# ~ SELECT "id" FROM "people" WHERE ("id" = '804c9b...') ORDER
BY "id" LIMIT 1
size 36
default lambda { ::UUID.random_create.to_s }
def self.load(value, property)
value.to_s.downcase if value
end
def self.dump(value, property)
return nil unless value
value.to_s.downcase
end
def self.typecast(value, property)
value ? load(value.to_s, property) : nil
end
end
end
end
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