cornerstone.soup 1.0

Container for queryable Records.

Overview

cornerstone.soup provides a container for persistent records which are queryable. The code is tested with Plone3.3 but should work with any Zope2.10+ application, as long as the appropriate utility is provided as persistent local component.

Usage

Subclass the Soup object and give it an appropriate id

>>> from cornerstone.soup import Soup
>>> class MySoup(Soup):
...     id = u'mysoup'

We have to provide an ICatalogFactory implementation for our soup

>>> from zope.interface import implements
>>> from zope.catalog.catalog import Catalog
>>> from zope.catalog.field import FieldIndex
>>> from cornerstone.soup.interfaces import ICatalogFactory
>>> class MyCatalogFactory(object):
...     implements(ICatalogFactory)
...
...     def __call__(self):
...         catalog = Catalog()
...         catalog[u'name'] = FieldIndex(field_name='name',
...                                       field_callable=False)
...         return catalog

Now, these 2 objects must be registered under the same name as the id of the soup. Register the ICatalogFactory as utility via ZCML

<utility
  name="mysoup"
  factory=".mymodule.MyCatalogFactory"
  provides="cornerstone.soup.interfaces.ICatalogFactory"
/>

The ISoup utility is registered as a local component.

In Plone you can easily register you local components via GenericSetup. Therefor you have to provide a file named componentregistry.xml in your profile directory, which looks similar to this

<utilities>
  <utility
    name="mysoup"
    factory="mymodule.MySoup"
    interface="cornerstone.soup.interfaces.ISoup"
  />
</utilities>

After including cornerstone.soup and your module in your instance and after applying the GS profile, you can query the soup utility

>>> from zope.component import getUtility
>>> from cornerstone.soup.interfaces import ISoup
>>> soup = getUtility(ISoup, name=u'mysoup')

A Soup can only contain Records. A Record is a simple persistent object which accepts any keyword arguments on __init__ time. This arguments are used as Record properties. Be aware that the rules to persist to the ZODB applies here.

Create a Record and add it to soup

>>> from cornerstone.soup import Record
>>> record = Record(user='user1')
>>> id = soup.add(record)

Check querying

>>> [r for r in soup.query(user='user1')]
[<Record at ...>]

>>> [r for r in soup.query(user='nonexist')]
[]

Add some more Records

>>> id = soup.add(Record(user='user1'))
>>> id = soup.add(Record(user='user2'))
>>> u1records = [r for r in soup.query(user='user1')]
>>> u1records
[<Record at ...>,
<Record at ...>]

Change user attribute of one record

>>> u1records[0].data['user'] = 'user2'

The query still returns the old result. The Record must be reindexed

>>> [r for r in soup.query(user='user1')]
[<Record at ...>,
<Record at ...>]

>>> soup.reindex([u1records[0]])

>>> u1 = [r for r in soup.query(user='user1')]
>>> u1
[<Record at ...>]

>>> u2 = [r for r in soup.query(user='user2')]
>>> u2
[<Record at ...>,
<Record at ...>]

You can reindex all records in soup at once

>>> all = [r for r in soup.data.values()]
>>> all = sorted(all, key=lambda x: x.user)
>>> all
[<Record at ...>,
<Record at ...>,
<Record at ...>]

>>> all[-1].data['user'] = 'user3'
>>> soup.reindex()
>>> [r for r in soup.query(user='user3')]
[<Record at ...>]

You can also rebuild the catalog. In this case the catalog factory is called again and the new catalog is used. Lets modify catalog of catalog factory

>>> from zope.catalog.field import FieldIndex
>>> catalogfactory = getUtility(ICatalogFactory, name='mysoup')
>>> catalogfactory.catalog[u'name'] = FieldIndex(field_name='name',
...                                   field_callable=False)
>>> catalogfactory()[u'name']
<zope.catalog.field.FieldIndex object at ...>

Set name attribute on some record data, rebuild soup and check results

>>> all[0].data['name'] = 'name'
>>> all[1].data['name'] = 'name'
>>> all[2].data['name'] = 'name'
>>> soup.rebuild()
>>> [r for r in soup.query(name='name')]
[<Record at ...>,
<Record at ...>,
<Record at ...>]

We can delete items as well hurrey

>>> del soup[all[0]]
>>> [r for r in soup.query(name='name')]
[<Record at ...>,
<Record at ...>]

For huge expected results we can query LazyRecords. They return the real record on call

>>> lazy = [l for l in soup.lazy(name='name')]
>>> lazy
[<cornerstone.soup.soup.LazyRecord object at ...>,
<cornerstone.soup.soup.LazyRecord object at ...>]

>>> lazy[0]()
<Record at ...>

Changes

• 1.0 - complete tests 2009-12-02 - rnix - remove IIntIds and INameChooser dependencies 2009-12-02 - rnix, jensens

• 1.0b2 - change namechoosing of records. Use uuid.uuid4() 2009-10-01 - rnix - add lazy function for querying huge results 2009-10-01 - rnix - yield query result instead of collect in a list 2009-09-29 - rnix

• 1.0b1 - initial work - rnix, jensens

Contributors

• Robert Niederreiter <[e-mail]>

• Jens Klein <[e-mail]>

License

Copyright (c) 2008-2009, BlueDynamics Alliance, Austria All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of the BlueDynamics Alliance nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY BlueDynamics Alliance ‘’AS IS’’ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BlueDynamics Alliance BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.