I tried to save and load a model and got the wrong value for a
property if the property was set from a method
The following test shows, what works and what doesn't
I want to know, if I do something wrong and
if there is a way to avoid the failure e.g. by setting a condition
==
# require File.dirname(__FILE__) + "/test_helper"
require 'test/unit'
require 'rubygems'
require 'dm-core'
require 'dm-migrations'
# An in-memory Sqlite3 connection:
DataMapper.setup(:default, 'sqlite::memory:')
class SimpleChunk
include DataMapper::Resource
property :id, Serial # auto-increment integer key
property :content, String
property :occured, Integer, :default => 0 # number of
occurences
def occur(ntimes = 1)
@occured += ntimes
end
end
# I tried to save and load a model and got the wrong value for a
property if the property was set from a method
# The following test shows, what works and what doesn't
#
# I want to know, if I do something wrong and
# if there is a way to avoid the failure e.g. by setting a condition
class SimpleChunkWithoutDefault
include DataMapper::Resource
property :id, Serial # auto-increment integer key
property :content, String
property :occured, Integer # number of occurences - NO
Default!
def occur(ntimes = 1)
@occured += ntimes
end
end
DataMapper.finalize
DataMapper.auto_migrate!
class TestFailure < Test::Unit::TestCase
def setup
DataMapper.finalize.auto_migrate! # make sure db is empty
end
# this is what I wanted to do
# and it fails
def test_save_chunk_fails_when_property_is_set_from_method
chunk1 = SimpleChunk.first_or_create(:content => 'xyz')
chunk1.occur(2)
# everything seems to work, state is ok
assert_equal 2, chunk1.occured
chunk1.raise_on_save_failure = true
chunk1.save
# state is still ok
assert_equal 2, chunk1.occured
# now the error comes ..
# first_or_create loads the corret object, but
# the property 'occured' is <0> (default value) instead of <2>
(as it was saved)
chunk2 = SimpleChunk.first_or_create(:content => 'xyz')
# assert_equal 2, chunk2.occured # fails: <2> expected but was
<0>.
chunk2.occur
assert_equal 3, chunk2.occured # fails: <3> expected but was
<1>.
end
def test_but_save_chunk_without_default_works
chunk1 = SimpleChunkWithoutDefault.first_or_create(:content =>
'xyz')
chunk1.occured = 0 # there is no default, so we have to init the
property before we can count occurences
chunk1.occur(2)
chunk1.raise_on_save_failure = true
chunk1.save
assert_equal 2, chunk1.occured
# now everything works
chunk2 = SimpleChunkWithoutDefault.first_or_create(:content =>
'xyz')
chunk2.occur
assert_equal 3, chunk2.occured
end
def test_and_save_chunk_with_property_set_from_outside_works_too
chunk1 = SimpleChunk.first_or_create(:content => 'xyz')
chunk1.occured += 2
chunk1.raise_on_save_failure = true
chunk1.save
assert_equal 2, chunk1.occured
# now everything works
chunk2 = SimpleChunk.first_or_create(:content => 'xyz')
chunk2.occur
assert_equal 3, chunk2.occured
end
end
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