python和odoo中的self.pool.get()是什么？

Question

我假设它用于引用openerp中其他模块中的字段,但我不确定.

在这里,他们以某种方式从一个产品模块到销售模块获得价格.

price = self.pool.get('product.pricelist').price_get(cr, uid, [pricelist], product, qty or 1.0, partner_id, ctx)[pricelist]
    if price is False:
        warn_msg = _("Cannot find a pricelist line matching this product and quantity.\n"
                "You have to change either the product, the quantity or the pricelist.")

        warning_msgs += _("No valid pricelist line found ! :") + warn_msg +"\n\n"
    else:
        result.update({'price_unit': price})
        if context.get('uom_qty_change', False):
            return {'value': {'price_unit': price}, 'domain': {}, 'warning': False}

Answer 1

self.pool.get()

在pool这里只是被用来存储的情况下,类似字典的对象OpenERP models,如res.users或ir.model.data.

OpenERP/Odoo的多数据库特性:单个OpenERP服务器进程可以管理多个数据库,对于每个数据库,已安装模块的集合以及模型集可以有所不同.

所以,我们有不同的pools,每个数据库一个,以及引用我们已经在的模型实例的常规方法,self

感谢The Hypered Blog对该网站的精彩解释self.pool.get().有关更多信息,请检查该链接.

Answer 2

水池

池是一个注册表（字典对象{}）。

注册表本质上是模型名称和模型实例之间的映射。每个数据库有一个注册表实例。

服务器/openerp/osv/orm.py

class BaseModel(object):

    def __init__(self, pool, cr):

    """ Initialize a model and make it part of the given registry.

        - copy the stored fields' functions in the osv_pool,
        - update the _columns with the fields found in ir_model_fields,
        - ensure there is a many2one for each _inherits'd parent,
        - update the children's _columns,
        - give a chance to each field to initialize itself.

        """

        pool.add(self._name, self)
        self.pool = pool

参考/openerp/sql_db.py查看Odoo-Postgresql 连接池如何建立。

_Pool = None

def db_connect(to, allow_uri=False):
    global _Pool
    if _Pool is None:
        _Pool = ConnectionPool(int(tools.config['db_maxconn']))

    db, uri = dsn(to)
    if not allow_uri and db != to:
        raise ValueError('URI connections not allowed')
    return Connection(_Pool, db, uri)

def close_db(db_name):
    """ You might want to call openerp.modules.registry.RegistryManager.delete(db_name) along this function."""
    global _Pool
    if _Pool:
        _Pool.close_all(dsn(db_name)[1])

def close_all():
    global _Pool
    if _Pool:
        _Pool.close_all()

连接等级

class Connection(object):
    """ A lightweight instance of a connection to postgres
    """
    def __init__(self, pool, dbname, dsn):
        self.dbname = dbname
        self.dsn = dsn
        self.__pool = pool

如果您查看 /server/openerp/pooler.py文件，您可以找到get_db_and_pool方法，该方法用于创建并返回数据库连接和新初始化的注册表，还有许多其他与池相关的方法，请查看这些。

def get_db_and_pool(db_name, force_demo=False, status=None, update_module=False):
    """Create and return a database connection and a newly initialized registry."""
    registry = RegistryManager.get(db_name, force_demo, status, update_module)
    return registry.db, registry


def restart_pool(db_name, force_demo=False, status=None, update_module=False):
    """Delete an existing registry and return a database connection and a newly initialized registry."""
    registry = RegistryManager.new(db_name, force_demo, status, update_module)
    return registry.db, registry

def get_db(db_name):
    """Return a database connection. The corresponding registry is initialized."""
    return get_db_and_pool(db_name)[0]


def get_pool(db_name, force_demo=False, status=None, update_module=False):
    """Return a model registry."""
    return get_db_and_pool(db_name, force_demo, status, update_module)[1]

最后调用字典的 get 方法来获取指定键的值，甚至可以使用self.pool['model_name']，字典的任何方法都可以与 pool 一起使用。