Model

A model is returned from thinky.createModel

getTableName

Model.getTableName();

Return the name of the table used for this model.

Example: Return the name of table used for PostModel.

var PostModel = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    author: type.string()
});

PostModel.getTableName(); // returns "Post"

define

Model.define(key, fn);

Define a function that documents will be available for documents of this Model.

Example: Add a method isAdult on Users.

var User = thinky.createModel("User", {
    id: type.string(),
    age: type.number()
});

User.define("isAdult", function() {
    return this.age > 18;
});

var kid = new User({age: 12});
kid.isAdult(); // false

var grownup = new User({age: 23});
grownup.isAdult(); // true

defineStatic

Model.defineStatic(key, fn);

Define a function that will be available for this Model and on its query.

Example: Add a method getView on Users to never return the password.

var User = thinky.createModel("User", {
    id: type.string(),
    age: type.number(),
    password: type.string()
});

User.defineStatic("getView", function() {
    return this.without('password');
});

User.get(1).getView().run().then(user) {
    /// user.password === undefined
}).error(function(err) {
    // Handle error
});

ensureIndex

Model.ensureIndex(name, fn, options);

Ensure that an index named "name" exists. If it does not, it will create an index based on the name and the function fn provided.

If fn is undefined, the index will be built on the field "name".

The argument options can be {multi: true}.

Example: Ensure that an index on the field "createdAt" exists.

var Posts = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string(),
    createdAt: Date
});

Posts.ensureIndex("createdAt")

Example: Ensure that an index on the concatenation of "firstName" and "lastName" exists.

var Users = thinky.createModel("User", {
    id: type.string(),
    firstName: type.string(),
    lastName: type.string()
});

Users.ensureIndex("fullName", function(doc) {
    return doc("firstName").add(doc("lastName"));
})

hasOne

Model.hasOne(OtherModel, fieldName, leftKey, rightKey[, options]);

Define a “has one” relation between two models. The foreign key is rightKey and will be stored in OtherModel.

If you want to store the foreign key on the model creating the relation, use belongsTo.
Do not use the primary key of OtherModel as the right key.

The arguments are:

  • OtherModel: the joined model.
  • fieldName: the field where the joined document will be stored.
  • leftKey: the field of Model used to perform the join.
  • rightKey: the field of OtherModel used to perform the join.
  • options: set the field init to false if the indexes were already created and do not want thinky to try to create them.

Read more about hasOne on the article dedicated to relations.

Example:

var User = thinky.createModel("User", {
    id: type.string(),
    name: type.string()
});

var Account = thinky.createModel("Account", {
    id: type.string(),
    userId: type.string(),
    sold: type.number()
});

User.hasOne(Account, "account", "id", "userId")

A user with its joined account will look like:

{
    id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
    name: "Michel",
    account: {
        id: "3851d8b4-5358-43f2-ba23-f4d481358901",
        userId: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
        sold: 2420
    }
}

belongsTo

Model.belongsTo(OtherModel, fieldName, leftKey, rightKey[, options]);

Define a “belongs to” relation between two models. The foreign key is leftKey and will be stored in Model.

If you want to store the foreign key on the joined model, use hasOne.

The arguments are:

  • OtherModel: the joined model.
  • fieldName: the field where the joined document will be stored.
  • leftKey: the field of Model used to perform the join.
  • rightKey: the field of OtherModel used to perform the join.
  • options: set the field init to false if the indexes were already created and do not want thinky to try to create them.

Read more about belongsTo on the article dedicated to relations.
Do not use the primary key of Model as the left key.

Example:

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string(),
    authorId: type.string()
});

var Author = thinky.createModel("Author", {
    id: type.string(),
    name: type.string()
});

Post.belongsTo(Author, "author", "authorId", "id")

A post with its joined author will look like:

{
    id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
    title: "Hello world",
    content: "This is the first post",
    authorId: "3851d8b4-5358-43f2-ba23-f4d481358901",
    author: {
        id: "3851d8b4-5358-43f2-ba23-f4d481358901",
        name: "Michel"
    }
}

hasMany

Model.hasMany(OtherModel, fieldName, leftKey, rightKey[, options]);

Define a “has many” relation between two models where the reciprocal relation is a “belongs to”.
The foreign key is rightKey and will be stored in OtherModel.

If you need a “many to many” relation between two models, use hasAndBelongsToMany.
Do not use the primary key of OtherModel as the right key.

The arguments are:

  • OtherModel: the joined model.
  • fieldName: the field where the joined document will be stored.
  • leftKey: the field of Model used to perform the join.
  • rightKey: the field of OtherModel used to perform the join.
  • options: set the field init to false if the indexes were already created and do not want thinky to try to create them.

Read more about hasMany on the article dedicated to relations

Example:

var Author = thinky.createModel("Author", {
    id: type.string(),
    name: type.string()
});

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string(),
    authorId: type.string()
});

Author.hasMany(Post, "posts", "id", "authorId")

A user with its joined posts will look like:

{
    id: "3851d8b4-5358-43f2-ba23-f4d481358901",
    name: "Michel",
    posts:[
        {
            id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
            title: "Hello world",
            content: "This is the first post",
            authorId: "3851d8b4-5358-43f2-ba23-f4d481358901",
        }, {
            id: "706f7730-8f28-4e57-8555-255b0746919b",
            title: "Second post",
            content: "This is the second post",
            authorId: "3851d8b4-5358-43f2-ba23-f4d481358901",
        }, {
            id: "18cadb27-54b6-41ab-b6e2-e1c49603e82f",
            title: "One more post",
            content: "This is the third post",
            authorId: "3851d8b4-5358-43f2-ba23-f4d481358901",
        }
    ]
}

hasAndBelongsToMany

Model.hasAndBelongsToMany(OtherModel, fieldName, leftKey, rightKey[, options]);

Define a “has and belongs to many” relation between two models where the reciprocal relation is another “has and belongs to many”.

If you need a “one to many” relations between two models, use hasMany and belongsTo.

The join is done via a third table that is automatically created and managed by thinky.

  • OtherModel: the joined model.
  • fieldName: the field where the joined document will be stored.
  • leftKey: the field of Model used to perform the join.
  • rightKey: the field of OtherModel used to perform the join.
  • options:
    • set the field init to false if the indexes were already created and do not want thinky to try to create them.
    • set the field type to a string to differentiate two n-n relations for the same two models.
    • set the field table to an object specifying the table settings as you would with thinky.createModel You can also specify a string for type which will be used to differentiate the table if you link multiple times the same models.

We highly recommend to use the primary keys for the fields used to perform the join.
If you do not, read carefully the article dedicated to relations

Example: Link two models with hasAndBelongsTo.

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string()
});
var Tag = thinky.createModel("Tag", {
    id: type.string(),
    tag: type.string()
});

Post.hasAndBelongsToMany(Tag, "tags", "id", "id")

A post with its joined tags will look like:

{
    id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
    title: "Hello world",
    content: "This is the first post",
    tags: [
        {
            id: "3851d8b4-5358-43f2-ba23-f4d481358901",
            tag: "test"
        }, {
            id: "706f7730-8f28-4e57-8555-255b0746919b",
            tag: "blog"
        }, {
            id: "18cadb27-54b6-41ab-b6e2-e1c49603e82f",
            tag: "random"
        }
    ]
}

Note: The links saved in the database are hidden from the result.

Example: Link two models with hasAndBelongsTo both ways.

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string()
});
var Tag = thinky.createModel("Tag", {
    id: type.string(),
    tag: type.string()
});

Post.hasAndBelongsToMany(Tag, "tags", "id", "id")
Tag.hasAndBelongsToMany(Post, "posts", "id", "id")

A post with its joined tags will look like:

{
    id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
    title: "Hello world",
    content: "This is the first post.",
    tags: [
        {
            id: "3851d8b4-5358-43f2-ba23-f4d481358901",
            tag: "test"
        }, {
            id: "706f7730-8f28-4e57-8555-255b0746919b",
            tag: "blog"
        }, {
            id: "18cadb27-54b6-41ab-b6e2-e1c49603e82f",
            tag: "random"
        }
    ]
}

A tag with its joined posts will look like:

{
    id: "3851d8b4-5358-43f2-ba23-f4d481358901",
    tag: "test"
    posts: [
    {
        id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
        title: "Hello world",
        content: "This is the first post.",
    }, {
        id: "eaed7d80-5205-488c-aedc-eb91e9f77d6b",
        title: "Second test",
        content: "Trying another post.",
    }
    ]
}

Example: Link documents of the same models between them.

var User = thinky.createModel("User", {
    id: type.string(),
    name: type.string(),
    email: type.string()
});

User.hasAndBelongsToMany(User, "friends", "id", "id")

A user with its friends will look like:

{
    id: "0e4a6f6f-cc0c-4aa5-951a-fcfc480dd05a",
    name: "Michel",
    email: "[email protected]",
    friends: [
        {
            id: "3851d8b4-5358-43f2-ba23-f4d481358901",
            name: "Marc",
            email: "[email protected]"
        }, {
            id: "706f7730-8f28-4e57-8555-255b0746919b",
            name: "Sophia",
            email: "[email protected]"
        }, {
            id: "18cadb27-54b6-41ab-b6e2-e1c49603e82f",
            name: "Ben",
            email: "[email protected]"
        }
    ]
}

Example: Use type to create multiple relations.

var Class = thinky.createModel("Class", {
    id: type.string(),
});
var People = thinky.createModel("People", {
    id: type.string(),
    name: type.string()
});

Class.hasAndBelongsToMany(People, "teachers", "id", "id", {type: "teacher"})
People.hasAndBelongsToMany(Class, "classes", "id", "id", {type: "teacher"})

Class.hasAndBelongsToMany(People, "students", "id", "id", {type: "student"})
People.hasAndBelongsToMany(Class, "classes", "id", "id", {type: "student"})

### pre

Model.pre(event, hook)

Add a hook that will be execcuted just before an event. The available pre-hooks are save, delete, validate.

The argument hook is a function that takes no argument if it is synchrone. If it as asynchrone, it takes exactly one argument function(next) { ... }. Call next when the hook is executed, and call it with an error if you want the current event to be aborted. The context of the hook will be set to the document triggering the event.

Note 1: The method Document.validate is by default synchronous but will become asynchronous if an asynchonous hook is set on validate (and therefore will return a promise).

Note 2: If you set the option validate to oncreate for a Model, new Model(...) will return a promise. This behavior is probably not something you want.

Example: Make sure that the age of a user is greater than 18 before saving a document.

var User = thinky.createModel("User", {
    id: type.string(),
    age: type.number()
});
User.pre('save', function(next) {
    if (this.age < 18) {
        next(new Error("A user must be at least 18 years old."));
    }
    else {
        next();
    }
});

Example: Make sure that the website of of a user works.

var User = thinky.createModel("User", {
    id: type.string(),
    website: type.string()
});
User.pre('save', true, function(next) {
    var self = this;
    r.http(self.website).run().then(function() {
        next();
    }).error(next);
});

### post

Model.post(event, hook)

Add a hook that will be execcuted just after an event. The available post-hooks are save, delete, validate, init, retrieve.

The argument hook is a function that takes no argument if it is synchrone. If it as asynchrone, it takes exactly one argument function(next) { ... }. Call next when the hook is executed, and call it with an error if you want the current event to be aborted. The context of the hook will be set to the document triggering the event.

Note 1: The method Document.validate is by default synchronous but will become asynchronous if an asynchonous hook is set on validate (and therefore will return a promise).

Note 2: If you set an asynchronous hook for init, new Model(...) will return a promise. This behavior is probably not something you want.
If you want to set a hook only when a document is retrieved from the database, use the event retrieve.

Example: Add an extra field isAdult but do not save it in the database.

var User = thinky.createModel("User", {
    id: type.string(),
    age: type.number()
});
User.pre('save', function(next) {
    delete this.isAdult;
    next();
});
User.post('save', function(next) {
    this.isAdult = this.age >= 18;
    next();
});
User.post('init', function(next) {
    this.isAdult = this.age >= 18;
    next();
});

### save

Model.save(object, options) -> Promise
Model.save(array, options) -> Promise

Insert documents in the database. If an array of documents is provided, thinky will execute a batch insert with only one insert command. The object options can be the options provided to insert, that is to say {conflict: 'error'/'replace'/'update'}.

If one error is produced by the server, the promise will be rejected.

Note: This method does not save joined documents and does not perform an update like document.save() can.

Example: Insert 3 new users at the same time.

var User = thinky.createModel("User", {
    id: type.string(),
    name: type.string()
});

User.save([
    {name: "Michel"},
    {name: "John"},
    {name: "Jessie"}
]).then(function(result) {
    // Michel, John and Jessie are saved
}).error(function(error) {
    // Handle error
});


### Query’s methods

All the methods defined on a Query object are also available on a Model.

In terms of Query, a model is equivalent to

r.table(model.getTableName())

Example: Returns all the posts using run.

Suppose the model Post is defined with:

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string()
})

Retrieve all the posts.

Post.run().then(function(posts) {
    // `posts` is an array of all the posts.
});

Order all the posts with the field createdAt.

Post.orderBy({index: {createdAt}).run().then(function(posts) {
    // `posts` is an array of all the posts order by date
});

Map each post to its title.

Post.map(function(post) {
    return post("title")
}).execute().then(function(posts) {
    // `posts` is an array of all the titles
});

### EventEmitter’s methods

All the methods defined on EventEmitter are available on a model.

The events that can be emited are: - "ready": when the table and all the indexes are created. - "retrieved": when a document is retrieved from the database.

Example: Log when a table is ready to use:

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string(),
    authorId: type.string()
});

Post.addListener('ready', function(model) {
    console.log("Table "+model.getTableName()+" is ready");
});

Example: Update a document every time it is retrieved from the database with a field “retrieved” mapped to the current date.

Post.addListener('retrieved', function(doc) {
    doc.retrieved = new Date();
});

### EventEmitter’s methods for documents

All the methods defined on EventEmitter are available on a document.

For convenience purposes, you can define listeners on the model that will be transmitted on each newly created documents. All the methods are the same as in EventEmitter, except that they are prefixed with "doc" (using camelCase).

The events that can be emited on a document are:

  • "saving": just before a document is saved
  • "saved": once a document is saved
  • "delete": once a document is deleted

Example: Log every post that we save in the database.

var Post = thinky.createModel("Post", {
    id: type.string(),
    title: type.string(),
    content: type.string(),
    authorId: type.string()
});

Post.docAddListener('save', function(post) {
    console.log("A new post has been saved.");
    console.log("Saved post'id: "+post.id);
});

var post = new Post({
    title: "Hello",
    content: "First post."
});

post.save().then(function) {
    // A message has been logged.
}).error(console.log);