Definition
To define mapping between a model and a table, use the define
method.
toshihiko.define("name", [
{ name: "column1", column: "column_1", type: T.Type.String, primaryKey: true, default: "1" },
{ name: "column2", type: T.Type.Integer, primaryKey: true },
{ name: "column3", type: T.Type.Json, allowNull: true },
...
]);
In each column, you may see some definition:
- name: column name in code logic, recommanded to be in lower camel case;
- column: real column name in your data source; if not existing, it will be as same as name;
- type: column type;
- primaryKey: if it's primary key; toshihiko supports multiple primary keys;
- default: default value;
- allowNull: if it's allowed to be null;
- validators: a function or an array of functions to indicate validator(s);
- etc. Reference to Toshihiko API.
And the third parameter of toshihiko.define
is optional, indicates for options
. You can define something like local cache options here.
Validators
Define an validator like this:
toshihiko.define("name", [{
name: "column",
type: T.Type.String,
// let this column must be `"abc"`
validators: function(value) {
if(value !== "abc") {
return "This column must be `abc`.";
}
}
}]);
Or with callback function:
toshihiko.define("name", [{
name: "column",
type: T.Type.String,
// let this column must be `"abc"`
validators: function(value, callback) {
if(value !== "abc") {
return callback(new Error("This column must be `abc`."));
}
return callback();
}
}]);
And if you want to define several validators for one column, you may use an array:
function validator1(...) {
// ...
}
function validator2(...) {
// ...
}
toshihiko.define("name", [{
name: "column",
type: T.Type.String,
validators: [ validator1, validator2 ]
}]);
Data Types
Below are some of the datatypes supported by Toshihiko. For a full and updated list, see Data Types.
T.Type.Boolean // recommend to mapping TINYINT
T.Type.Datetime // recommend to mapping DATETIME
T.Type.Float // recommend to mapping DECIMAL / DOUBLE / FLOAT / etc.
T.Type.Integer // recommend to mapping TINYINT / INT / etc.
T.Type.Json // recommend to mapping TEXT / LONGTEXT / etc.
T.Type.String // recommend to mapping TEXT / LONGTEXT / CHAR() / VARCHAR() / etc.
And what's more, you can define your own data type. See Define a Data Type.
Define Properties
You can add some properties to your model object. Just assign it.
const Model = toshihiko.define(...);
Model.foo = "bar";
Model.baz = "baa";
// ...
Define Methods
You can add some methods to your model object. Just assign it.
const Model = toshihiko.define(...);
Model.getListByPage = function(page, limit, callback) {
return this.limit([ page, limit ]).find(callback);
};
Cache
The 3rd parameter of toshihiko.define
may contain a cache option.
For an example, if you use Toshihiko-Memcached you should install it first.
$ npm install --save toshihiko-memcached
And you may configure it at the 3rd parameter.
toshihiko.define("...", [
...
], {
cache: {
name: "memcached",
servers: [ "localhost:11211" ],
options: {
prefix: "_"
}
}
});
NOTICE: If you have defined the cache in Toshihiko before, cache defined in model will override the previous configuration in this model. What's more, if you define cache as
null
in model, cache in this model will never be used.