Creating assocations in sequelize is done by calling one of the belongsTo / hasOne / hasMany functions
on a model (the source), and prodiving another model as the first argument to the function (the target).
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@@ -10,7 +10,7 @@ on a model (the source), and prodiving another model as the first argument to th
Creating an association will add a foreign key constraint to the attributes. All associations use `CASCADE` on update and `SET NULL` on delete, except for n:m, which also uses `CASCADE` on delete.
When creating associations, you can provide an alias, via the `as` option. This is usefull if the same model
When creating associations, you can provide an alias, via the `as` option. This is useful if the same model
is associated twice, or you want your association to be called something other than the name of the target model.
As an example, consider the case where users have many pictures, one of which is their profile picture. All pictures
have a `userId`, but in addition the user model also has a `profilePictureId`, to be able to easily load the user's profile
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@@ -89,7 +89,7 @@ you should either disable some constraints, or rethink your associations complet
A virtual value that is not stored in the DB. This could for example be useful if you want to provide a default value in your model that is returned to the user but not stored in the DB.
You could also use it to validate a value before permuting and storing it. Checking password length before hashing it for example:
Sequelize provides a host of custom error classes, to allow you to do easier debugging. All of these errors are exposed on the sequelize object and the sequelize constructor.
All sequelize errors inherit from the base JS error object.
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@@ -9,7 +9,7 @@ All sequelize errors inherit from the base JS error object.
Set is used to update values on the instance (the sequelize representation of the instance that is, remember that nothing will be persisted before you actually call `save`).
In its most basic form `set` will update a value stored in the underlying `dataValues` object. However, if a custom setter function is defined for the key, that function
will be called instead. To bypass the setter, you can pass `raw: true` in the options object.
If changed is called with a string it will return a boolean indicating whether the value of that key in `dataValues` is different from the value in `_previousDataValues`.
If changed is called without an argument, it will return an array of keys that have changed.
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Validate this instance, and if the validation passes, persist it to the database.
On success, the callback will be called with this instance. On validation error, the callback will be called with an instance of `Sequelize.ValidationError`.
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Destroy the row corresponding to this instance. Depending on your setting for paranoid, the row will either be completely deleted, or have its deletedAt timestamp set to the current time.
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@@ -321,7 +321,7 @@ Destroy the row corresponding to this instance. Depending on your setting for pa
Increment the value of one or more columns. This is done in the database, which means it does not use the values currently stored on the Instance. The increment is done using a
Decrement the value of one or more columns. This is done in the database, which means it does not use the values currently stored on the Instance. The decrement is done using a
Convert the instance to a JSON representation. Proxies to calling `get` with no keys. This means get all values gotten from the DB, and apply all custom getters.
A Model represents a table in the database. Sometimes you might also see it refererred to as model, or simply as factory. This class should _not_ be instantiated directly, it is created using `sequelize.define`, and already created models can be loaded using `sequelize.import`
### Mixes:
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Find all the rows matching your query, within a specified offset / limit, and get the total number of rows matching your query. This is very usefull for paging
Insert or update a single row. An update will be executed if a row which matches the supplied values on either the primary key or a unique key is found. Note that the unique index must be defined in your sequelize model and not just in the table. Otherwise you may experience a unique constraint violation, because sequelize fails to identify the row that should be updated.
The success handler is passed an array of instances, but please notice that these may not completely represent the state of the rows in the DB. This is because MySQL
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A slightly modified version of bluebird promises. This means that, on top of the methods below, you can also call all the methods listed on the link below.
The main difference is that sequelize promises allows you to attach a listener that will be called with the generated SQL, each time a query is run.
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Instantiate sequelize with name of database, username and password
#### Example usage
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| [username=null] | String | The username which is used to authenticate against the database. |
| [password=null] | String | The password which is used to authenticate against the database. |
| [options={}] | Object | An object with options. |
| [options.dialect='mysql'] | String | The dialect you of the database you are connecting to. One of mysql, postgres, sqlite and mariadb |
| [options.dialect='mysql'] | String | The dialect of the database you are connecting to. One of mysql, postgres, sqlite and mariadb |
| [options.dialectModulePath=null] | String | If specified, load the dialect library from this path. For example, if you want to use pg.js instead of pg when connecting to a pg database, you should specify 'pg.js' here |
| [options.dialectOptions] | Object | An object of additional options, which are passed directly to the connection library |
| [options.storage] | String | Only used by sqlite. Defaults to ':memory:' |
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A reference to sequelize utilities. Most users will not need to use these utils directly. However, you might want to use `Sequelize.Utils._`, which is a reference to the lodash library, if you don't already have it imported in your project.
**See:**
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Exposes the validator.js object, so you can extend it with custom validation functions. The validator is exposed both on the instance, and on the constructor.
**See:**
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Define a new model, representing a table in the DB.
The table columns are define by the hash that is given as the second argument. Each attribute of the hash represents a column. A short table definition might look like this:
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Execute a query on the DB, with the posibility to bypass all the sequelize goodness.
By default, the function will return two arguments: an array of results, and a metadata object, containing number of affected rows etc. Use `.spread` to access the results.
Creates a object representing a database function. This can be used in search queries, both in where and order parts, and as default values in column definitions.
If you want to refer to columns in your function, you should use `sequelize.col`, so that the columns are properly interpreted as columns and not a strings.
Creates a object representing a column in the DB. This is often useful in conjunction with `sequelize.fn`, since raw string arguments to fn will be escaped.
**See:**
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Start a transaction. When using transactions, you should pass the transaction in the options argument in order for the query to happen under that transaction
