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"""The application's model objects""" import sqlalchemy as sa from sqlalchemy import orm from simplesite.model import meta # Add these two imports: import datetime from sqlalchemy import schema, types def init_model(engine): """Call me before using any of the tables or classes in the model""" ## Reflected tables must be defined and mapped here #global reflected_table #reflected_table = sa.Table("Reflected", meta.metadata, autoload=True, # autoload_with=engine) #orm.mapper(Reflected, reflected_table) # We are using SQLAlchemy 0.5 so transactional=True is replaced by # autocommit=False sm = orm.sessionmaker(autoflush=True, autocommit=False, bind=engine) meta.engine = engine meta.Session = orm.scoped_session(sm) # Replace the rest of the file with the model objects we created in # chapter 7 def now(): return datetime.datetime.now() page_table = schema.Table('page', meta.metadata, schema.Column('id', types.Integer, schema.Sequence('page_seq_id', optional=True), primary_key=True), schema.Column('content', types.Text(), nullable=False), schema.Column('posted', types.DateTime(), default=now), schema.Column('title', types.Unicode(255), default=u'Untitled Page'), schema.Column('heading', types.Unicode(255)), ) comment_table = schema.Table('comment', meta.metadata, schema.Column('id', types.Integer, schema.Sequence('comment_seq_id', optional=True), primary_key=True), schema.Column('pageid', types.Integer, schema.ForeignKey('page.id'), nullable=False), schema.Column('content', types.Text(), default=u''), schema.Column('name', types.Unicode(255)), schema.Column('email', types.Unicode(255), nullable=False), schema.Column('created', types.TIMESTAMP(), default=now()), ) pagetag_table = schema.Table('pagetag', meta.metadata, schema.Column('id', types.Integer, schema.Sequence('pagetag_seq_id', optional=True), primary_key=True), schema.Column('pageid', types.Integer, schema.ForeignKey('page.id')), schema.Column('tagid', types.Integer, schema.ForeignKey('tag.id')), )

Once Alice is authenticated by the CA, the CA signs Alice s certificate with the CA s secret key:

is supported. This means that it reads the image in several passes, making it possible to show the image gradually. The ASCII art image plugin never attempts to implement it.

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tag_table = schema.Table('tag', meta.metadata, schema.Column('id', types.Integer, schema.Sequence('tag_seq_id', optional=True), primary_key=True), schema.Column('name', types.Unicode(20), nullable=False, unique=True), ) class Page(object): pass class Comment(object): pass class Tag(object): pass orm.mapper(Comment, comment_table) orm.mapper(Tag, tag_table) orm.mapper(Page, page_table, properties={ 'comments':orm.relation(Comment, backref='page'), 'tags':orm.relation(Tag, secondary=pagetag_table) }) As I mentioned, this will look very familiar because it is a similar setup to the one you used in the previous chapter. There are some points to note about this code, though: The MetaData object Pylons uses is defined in model/meta.py so is accessed here as meta.metadata, whereas in the previous chapter the examples just used metadata. Pylons generated the init_model() function when the project was created. It gets called after the engine has been created each time your application starts from config/environment.py to connect the model to the database.

Listing 11-1. The class declaration of the image IO plugin class TextImagePlugin : public QImageIOPlugin { public: TextImagePlugin(); ~TextImagePlugin(); QStringList keys() const; Capabilities capabilities( QIODevice *device, const QByteArray &format ) const; QImageIOHandler *create( QIODevice *device, const QByteArray &format = QByteArray() ) const; }; The most interesting of the methods is capabilities (shown in Listing 11-2), which determines what the plugin can do for a given format or device. This means that the format QByteArray must either contain the string ti or be empty for the plugin to be able to do anything with it. If the format QByteArray is empty, you must peek at the QIODevice. If it is open and writeable, you can always write to it. If it is readable, and the plugin can read from it (more about the static canRead method later on), you can read from it. It is important not to affect the device in any way (ensure that you are just peeking; not actually reading, writing, or seeking).

Pylons generates a project to use SQLAlchemy 0.4, but many users will want to use the newer SQLAlchemy 0.5 described in 7. They are very similar, but the transactional=True argument to orm. sessionmaker() in init_model() is deprecated. Instead, you should specify autocommit=False. This has the same behavior but will not generate a deprecation warning.

Alice now has a public key certificate, C(Alice) = (Ctext(Alice),Csig(Alice)), which she can use to prove that kp(Alice) is her public key. Each principal in our system can also obtain such a certificate to associate her identity with her public key.

Pylons has a built-in facility to allow users who download your application to easily set it up. The process is described in detail in the later SimpleSite tutorial chapters (s 14 and 19), but you ll use it here too so that you can easily set up the tables you need. The idea is that users of your application can simply run paster setup-app development.ini to have the database tables and any initial data created for them automatically. You can set up this facility through your project s websetup.py file. The default websetup.py file for a SQLAlchemy project looks like this:

Note A QByteArray can be treated as Qt s controlled version of char*. You can use it to carry text just like a plain C string. Never use QString to do that (as you might have been doing with std::string) because it internally converts to Unicode, which might corrupt your binary data.

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