author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Thu, 21 Jan 2010 17:03:30 +0100 | |
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.. -*- coding: utf-8 -*- |
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Frequently Asked Questions |
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[XXX 'copy answer from forum' means reusing text from |
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http://groups.google.com/group/google-appengine/browse_frm/thread/c9476925f5f66ec6 |
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and |
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http://groups.google.com/group/google-appengine/browse_frm/thread/d791ce17e2716147/eb078f8cfe8426e0 |
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and |
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http://groups.google.com/group/google-appengine/browse_frm/thread/f48cf6099973aef5/c28cd6934dd72457 |
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] |
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Why does not CubicWeb have a template language ? |
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There are enough template languages out there. You can use your |
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preferred template language if you want. [explain how to use a |
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template language] |
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*CubicWeb* does not define its own templating language as this was |
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not our goal. Based on our experience, we realized that |
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we could gain productivity by letting designers use design tools |
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and developpers develop without the use of the templating language |
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as an intermediary that could not be anyway efficient for both parties. |
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Python is the templating language that we use in *CubicWeb*, but again, |
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it does not prevent you from using a templating language. |
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The reason template languages are not used in this book is that |
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experience has proved us that using pure python was less cumbersome. |
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Why do you think using pure python is better than using a template language ? |
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Python is an Object Oriented Programming language and as such it |
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already provides a consistent and strong architecture and syntax |
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a templating language would not reach. |
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When doing development, you need a real language and template |
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languages are not real languages. |
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Using Python instead of a template langage for describing the user interface |
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makes it to maintain with real functions/classes/contexts without the need of |
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learning a new dialect. By using Python, we use standard OOP techniques and |
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this is a key factor in a robust application. |
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Why do you use the LGPL license to prevent me from doing X ? |
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LGPL means that *if* you redistribute your application, you need to |
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redistribute the changes you made to CubicWeb under the LGPL licence. |
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Publishing a web site has nothing to do with redistributing |
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source code. A fair amount of companies use modified LGPL code |
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for internal use. And someone could publish a *CubicWeb* component |
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under a BSD licence for others to plug into a LGPL framework without |
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any problem. The only thing we are trying to prevent here is someone |
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taking the framework and packaging it as closed source to his own |
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clients. |
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CubicWeb looks pretty recent. Is it stable ? |
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It is constantly evolving, piece by piece. The framework has evolved since |
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2001 and data has been migrated from one schema to the other ever since. There |
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is a well-defined way to handle data and schema migration. |
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Why is the RQL query language looking similar to X ? |
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It may remind you of SQL but it is higher level than SQL, more like |
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SPARQL. Except that SPARQL did not exist when we started the project. |
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With version 3.4, CubicWeb has support for SPARQL. |
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That RQL language is what is going to make a difference with django- |
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like frameworks for several reasons. |
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1. accessing data is *much* easier with it. One can write complex |
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queries with RQL that would be tedious to define and hard to maintain |
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using an object/filter suite of method calls. |
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2. it offers an abstraction layer allowing your applications to run |
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on multiple back-ends. That means not only various SQL backends |
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(postgresql, sqlite, mysql), but also multiple databases at the |
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same time, and also non-SQL data stores like LDAP directories and |
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subversion/mercurial repositories (see the `vcsfile` |
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component). Google App Engine is yet another supported target for |
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RQL. |
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[copy answer from forum, explain why similar to sparql and why better |
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than django and SQL] |
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which ajax library is CubicWeb using ? |
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[CubicWeb uses jQuery and adds a thin layer on top of that] |
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How is security implemented ? |
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This is an example of how it works in our framework: |
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.. sourcecode:: python |
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class Version(EntityType): |
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"""a version is defining the content of a particular project's |
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release""" |
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# definition of attributes is voluntarily missing |
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permissions = {'read': ('managers', 'users', 'guests',), |
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'update': ('managers', 'logilab', 'owners',), |
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'delete': ('managers', ), |
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'add': ('managers', 'logilab', |
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ERQLExpression('X version_of PROJ, U in_group G, ' |
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'PROJ require_permission P, ' |
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'P name "add_version", P require_group G'),)} |
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The above means that permission to read a Version is granted to any |
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user that is part of one of the groups 'managers', 'users', 'guests'. |
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The 'add' permission is granted to users in group 'managers' or |
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'logilab' and to users in group G, if G is linked by a permission |
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entity named "add_version" to the version's project. |
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.. sourcecode:: python |
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class version_of(RelationType): |
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"""link a version to its project. A version is necessarily linked |
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to one and only one project. """ |
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# some lines voluntarily missing |
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permissions = {'read': ('managers', 'users', 'guests',), |
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'delete': ('managers', ), |
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'add': ('managers', 'logilab', |
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RRQLExpression('O require_permission P, P name "add_version", ' |
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'U in_group G, P require_group G'),) } |
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You can find additional information in the section :ref:`security`. |
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[XXX what does the second example means in addition to the first one?] |
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What is `Error while publishing rest text ...` ? |
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------------------------------------------------ |
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While modifying the description of an entity, you get an error message in |
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the instance `Error while publishing ...` for Rest text and plain text. |
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The server returns a traceback like as follows :: |
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2008-10-06 15:05:08 - (cubicweb.rest) ERROR: error while publishing ReST text |
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Traceback (most recent call last): |
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File "/home/user/src/blogdemo/cubicweb/common/rest.py", line 217, in rest_publish |
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File "/usr/lib/python2.5/codecs.py", line 817, in open |
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file = __builtin__.open(filename, mode, buffering) |
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TypeError: __init__() takes at most 3 arguments (4 given) |
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This can be fixed by applying the patch described in : |
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http://code.google.com/p/googleappengine/issues/detail?id=48 |
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What are hooks used for ? |
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------------------------- |
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Hooks are executed around (actually before or after) events. The |
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most common events are data creation, update and deletion. They |
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permit additional constraint checking (those not expressible at the |
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schema level), pre and post computations depending on data |
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movements. |
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As such, they are a vital part of the framework. |
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Other kinds of hooks, called Operations, are available |
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for execution just before commit. |
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When should you define an HTML template rather than define a graphical component ? |
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---------------------------------------------------------------------------------- |
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An HTML template cannot contain code, hence it is only about static |
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content. A component is made of code and operations that apply on a |
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well defined context (request, result set). It enables much more |
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dynamic views. |
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|
1715 | 181 |
What is the difference between `AppRsetObject` and `AppObject` ? |
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---------------------------------------------------------------- |
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`AppRsetObject` instances are selected on a request and a result |
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set. `AppObject` instances are directly selected by id. |
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How to update a database after a schema modification ? |
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------------------------------------------------------ |
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189 |
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It depends on what has been modified in the schema. |
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* Update the permissions and properties of an entity or a relation: |
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``sync_schema_props_perms('MyEntityOrRelation')``. |
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* Add an attribute: ``add_attribute('MyEntityType', 'myattr')``. |
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* Add a relation: ``add_relation_definition('SubjRelation', 'MyRelation', 'ObjRelation')``. |
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How to create an anonymous user ? |
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--------------------------------- |
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This allows to bypass authentication for your site. In the |
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``all-in-one.conf`` file of your instance, define the anonymous user |
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as follows :: |
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# login of the CubicWeb user account to use for anonymous user (if you want to |
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# allow anonymous) |
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anonymous-user=anon |
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# password of the CubicWeb user account matching login |
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anonymous-password=anon |
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You also must ensure that this `anon` user is a registered user of |
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the DB backend. If not, you can create through the administation |
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interface of your instance by adding a user with the role `guests`. |
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This could be the admin account (for development |
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purposes, of course). |
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.. note:: |
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While creating a new instance, you can decide to allow access |
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to anonymous user, which will automatically execute what is |
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decribed above. |
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How to change the instance logo ? |
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------------------------------------ |
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There are two ways of changing the logo. |
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1. The easiest way to use a different logo is to replace the existing |
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``logo.png`` in ``myapp/data`` by your prefered icon and refresh. |
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By default all instance will look for a ``logo.png`` to be |
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rendered in the logo section. |
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.. image:: ../images/lax-book.06-main-template-logo.en.png |
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2. In your cube directory, you can specify which file to use for the logo. |
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This is configurable in ``mycube/data/external_resources``: :: |
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LOGO = DATADIR/path/to/mylogo.gif |
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where DATADIR is ``mycube/data``. |
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How to configure a LDAP source ? |
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-------------------------------- |
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Your instance's sources are defined in ``/etc/cubicweb.d/myapp/sources``. |
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Configuring an LDAP source is about declaring that source in your |
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instance configuration file such as: :: |
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[ldapuser] |
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adapter=ldapuser |
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# ldap host |
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host=myhost |
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# base DN to lookup for usres |
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user-base-dn=ou=People,dc=mydomain,dc=fr |
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# user search scope |
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user-scope=ONELEVEL |
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# classes of user |
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user-classes=top,posixAccount |
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# attribute used as login on authentication |
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user-login-attr=uid |
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# name of a group in which ldap users will be by default |
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user-default-group=users |
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# map from ldap user attributes to cubicweb attributes |
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user-attrs-map=gecos:email,uid:login |
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Any change applied to configuration file requires to restart your |
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instance. |
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I get NoSelectableObject exceptions, how do I debug selectors ? |
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--------------------------------------------------------------- |
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You just need to put the appropriate context manager around view/component |
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selection (one standard place in in vreg.py): |
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.. sourcecode:: python |
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def possible_objects(self, registry, *args, **kwargs): |
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"""return an iterator on possible objects in a registry for this result set |
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actions returned are classes, not instances |
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""" |
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from cubicweb.selectors import traced_selection |
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with traced_selection(): |
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for vobjects in self.registry(registry).values(): |
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try: |
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yield self.select(vobjects, *args, **kwargs) |
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except NoSelectableObject: |
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continue |
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Don't forget the 'from __future__ import with_statement' at the module |
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top-level. |
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This will yield additional WARNINGs, like this:: |
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2009-01-09 16:43:52 - (cubicweb.selectors) WARNING: selector one_line_rset returned 0 for <class 'cubicweb.web.views.basecomponents.WFHistoryVComponent'> |
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How to format an entity date attribute ? |
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---------------------------------------- |
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If your schema has an attribute of type Date or Datetime, you might |
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want to format it. First, you should define your preferred format using |
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the site configuration panel ``http://appurl/view?vid=systempropertiesform`` |
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and then set ``ui.date`` and/or ``ui.datetime``. |
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Then in the view code, use: |
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.. sourcecode:: python |
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self.format_date(entity.date_attribute) |
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Can PostgreSQL and CubicWeb authentication work with kerberos ? |
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---------------------------------------------------------------- |
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If you have PostgreSQL set up to accept kerberos authentication, you can set |
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the db-host, db-name and db-user parameters in the `sources` configuration |
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file while leaving the password blank. It should be enough for your |
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instance to connect to postgresql with a kerberos ticket. |
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How to load data from a script ? |
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-------------------------------- |
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The following script aims at loading data within a script assuming pyro-nsd is |
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running and your instance is configured with ``pyro-server=yes``, otherwise |
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you would not be able to use dbapi. |
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.. sourcecode:: python |
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from cubicweb import dbapi |
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333 |
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cnx = dbapi.connection(database='instance-id', user='admin', password='admin') |
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335 |
cur = cnx.cursor() |
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for name in ('Personal', 'Professional', 'Computers'): |
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cur.execute('INSERT Blog B: B name %s', name) |
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cnx.commit() |
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What is the CubicWeb datatype corresponding to GAE datastore's UserProperty ? |
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----------------------------------------------------------------------------- |
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If you take a look at your instance schema and |
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click on "display detailed view of metadata" you will see that there |
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is a Euser entity in there. That's the one that is modeling users. The |
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thing that corresponds to a UserProperty is a relationship between |
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your entity and the Euser entity. As in: |
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.. sourcecode:: python |
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class TodoItem(EntityType): |
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text = String() |
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todo_by = SubjectRelation('Euser') |
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[XXX check that cw handle users better by mapping Google Accounts to local Euser |
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entities automatically] |
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How to reset the password for user joe ? |
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---------------------------------------- |
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If you want to reset the admin password for ``myinstance``, do:: |
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$ cubicweb-ctl reset-admin-pwd myinstance |
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You need to generate a new encrypted password:: |
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$ python |
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>>> from cubicweb.server.utils import crypt_password |
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>>> crypt_password('joepass') |
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'qHO8282QN5Utg' |
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>>> |
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and paste it in the database:: |
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$ psql mydb |
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mydb=> update cw_cwuser set cw_upassword='qHO8282QN5Utg' where cw_login='joe'; |
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UPDATE 1 |
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I've just created a user in a group and it doesn't work ! |
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--------------------------------------------------------- |
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You are probably getting errors such as :: |
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remove {'PR': 'Project', 'C': 'CWUser'} from solutions since your_user has no read access to cost |
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This is because you have to put your user in the "users" group. The user has to be in both groups. |