[Zope] z3c.zalchemy : ComponentLookupError: (<InterfaceClass z3c.zalchemy.interfaces.IAlchemyEngineUtility>, 'DemoEngine-1')

[KLEIN Stephane]

Hi,

I've tested z3c.zalchemy package and I've this error :

"""
ComponentLookupError: (<InterfaceClass
z3c.zalchemy.interfaces.IAlchemyEngineUtility>, 'DemoEngine-1')
"""


This is the different step I've did :

1. I've installed a fresh python environment with virtuelenv 
2. I've installed zopeproject package (in this new python environment) 
3. I've created new zope project with bin/zopeprojet zalchemytest 
4. zope3 had installed with success
5. I've added z3c.zalchemy in install_requires in setup.py 
6. I've restarted buildout
7. z3c.zalchemy version 0.2.1 had downloaded and installed 
8. In src/zalchemytest/configure.zcml I've added this lines :

  <include package="z3c.zalchemy" />
  <include package="z3c.zalchemy" file="meta.zcml" />
  
  <include package="z3c.zalchemy.demo.demo_1" />

9. When I've started bin/zalchemytest-debug I've this error :

"""
 [snip]

  File "/home/harobed/Experimentations/zalchemy/buildout-eggs/
zope.component-3.4.0-py2.4.egg/zope/component/_api.py", line 207, in
getUtility
    raise ComponentLookupError(interface, name)
zope.configuration.xmlconfig.ZopeXMLConfigurationError: File "/home/
harobed/Experimentations/zalchemy/zalchemytest/site.zcml", line 4.2-4.36
    ZopeXMLConfigurationError: File "/home/harobed/Experimentations/
zalchemy/zalchemytest/src/zalchemytest/configure.zcml", line 30.0-30.46
    ZopeXMLConfigurationError: File "/home/harobed/Experimentations/
zalchemy/buildout-eggs/z3c.zalchemy-0.2.1-py2.4.egg/z3c/zalchemy/demo/
demo_1/configure.zcml", line 16.2-19.8
    ComponentLookupError: (<InterfaceClass
z3c.zalchemy.interfaces.IAlchemyEngineUtility>, 'DemoEngine-1') """

My investigation :

* DemoEngine-1 AlchemyEngineUtility is well declared in demo/demo_1/
configure.zcml
* If I comment this lines :

"""
  <!--
  <alchemy:connectClass
      class=".message.HelloWorldMessage"
      engine="DemoEngine-1"
      />
  -->
"""

bin/zalchemytest-debug start with success. And I can get DemoEngine-1
AlchemyEngineUtility with success in debug console.

* If I uncomment previous lines, I understand it's line below which throw
exception :

In demo/demo_1/message.py:

z3c.zalchemy.createTable('message', 'DemoEngine-1')

I've added debugger set_trace before this line and I've tryed to fetch
DemoEngine-1 AlchemyEngineUtility with no success. I don't understand why
it !

Thanks for your help,
Regards,
Stephane