设置

译者：飞龙

来源：Settings

设置用于储存键值对。设置对象是orm（默认值）上的实例，之后会为每个db连接和每个定义过的Model建立快照。所以orm.settings上的更改只会作用于更改之后建立的连接，而db.settings会作用于更改之后定义的模型。

var orm = require("orm");
orm.settings.set("some.deep.value", 123);
orm.connect("....", function (err, db) {
    // db.settings is a snapshot of the settings at the moment
    // of orm.connect(). changes to it don't affect orm.settings
    console.log(db.settings.get("some.deep.value")); // 123
    console.log(db.settings.get("some.deep"));       // { value: 123 }
    db.settings.set("other.value", { some: "object" });
    console.log(db.settings.get("other.value"));     // { some: "object" }
    console.log(orm.settings.get("other.value"));    // undefined
});

默认设置的结构是这样的：

var Settings = {
    properties : {
        primary_key     : "id",
        association_key : "{name}_{field}",
        required        : false
    },
    instance   : {
        cache           : true,
        cacheSaveCheck  : true,
        autoSave        : false,
        autoFetch       : false,
        autoFetchLimit  : 1,
        cascadeRemove   : true,
        returnAllErrors : false
    },
    connection : {
        reconnect       : true,
        pool            : false,
        debug           : false
    }
};