immutable-core-controller

Immutable Core Controller integrates with the Immutable App ecosystem to provide a class for defining controllers.

If a controller is insantiated with an Immutable Core Model default controllers will be created with standard CRUD functionality.

Immutable Core Controller v0.12 / Immutable App v0.17

ICC v0.12 is a major revision of functionality that goes along with channges in Immutable App v0.17 to remove support for server side rendering and focus exclusively on providing APIs.

ICC v0.12 removes support for linking objects, relations between objects, forms, and other functionality that was specific to server rendered pages.

Creating a default controller for model

const ImmutableCoreController = require('immutable-core-controller')
const ImmutableCoreModel = require('immutable-core-model')

var fooModel = new ImmutableCoreModel({
    properties: {
        bar: {type: string},
        foo: {type: string},
    },
    required: ['bar', 'foo'],
})

var fooController = new ImmutableCoreController({
    model: fooModel,
})

In this example a controller is created for fooModel using all default options.

With ImmutableApp a default controller will be created for every model automatically. The default controller can be customized and extended with additional controller file(s) in the same directory as the model.

Default methods

Method Name	Method	Path
create	POST	/
delete	DELETE	/:id
list	GET	/
read	GET	/:id
replace	PUT	/:id
update	PATCH	/:id
undelete	POST	/:id/undelete
schema	GET	/schema
validate	POST	/validate

create

Create a new model instance. Model schema will be used to validate input.

delete

Delete an instance. Only available if model has a (d)eleted column.

Delete is done with an HTTP DELETE request to the /:id path.

When doing an HTTP DELETE data set in the body with the model name will be merged into the data of the undeleted object.

list

The list method returns a list of model instances. This list is paginated and can be sorted and filtered by columns on the model.

Parameters are mapped to Immutable Core Model query args. For more complex queries JSON encoded query params can be set as the query param.

Free form queries can be executed using the search param.

read

Get a model instance by id. current param can be set to get the current revision of the instance and the deleted param can be set to return the object even it it is deleted.

replace

Replace an instance. Model schema will be used to validate input. If meta param is set then metaData such as accountId, parentId, and createTime can be specified.

Replace is available by doing an HTTP PUT request to /:id. Data in the request body will replace existing object data.

If a parentId is specified and the parent has already been revised then a 409 CONFLICT error will be returned.

undelete

Undelete an instance. Only available if model has a (d)eleted column.

Undelete is available by doing an HTTP POST to /:id/undelete.

When doing an HTTP POST data set in the body with the model name will be merged into the data of the undeleted object.

update

Update an instance. Model schema will be used to validate input. If meta param is set then metaData such as accountId, parentId, and createTime can be specified.

Update is available by doing an HTTP PATCH request to /:id. Data in the request body will be merged into existing object data.

If a parentId is specified and the parent has already been revised then a 409 CONFLICT error will be returned.

schema

Returns the JSON schema for the create method which is the same as the JSON schema for the model by default.

validate

Validates the data provided without saving it

Default method role

var fooController = new ImmutableCoreController({
    defaultRole: 'foo'
})

If a defaultRole is specified then all default methods will be created with that role.

Otherwise the default role will be all for read methods (list, read, schema, validate) and authenticated for write methods (create, delete, undelete, update).

Customizing default controllers

var fooController = new ImmutableCoreController({
    list: {
        fields: [
            'foo',
            'bar',
        ],
    },
    model: fooModel,
    update: false,
})

Options can be set for each default controller method with an object under the method name. The default controller for a method can be disabled by setting the value false.

Customizing query args for read and list

var fooController = new ImmutableCoreController({
    list: {
        query: {
            resolve: true,
        },
    },
    read: {
        query: {
            resolve: true,
        },
    },
    model: fooModel,
})

Any arguments set in the query object for list or view will be used as default arguments for the Immutable Core Model query performed by the default controller.

Creating a custom controller

var fooController = new ImmutableCoreController({
    paths: {
        '/foo': {
            get: {
                method: function (args) {
                    ...
                },
            },
        },
    },
})

Custom controllers are created by specifying the path, the http method, and an object defining the controller options for that path and http method.

The supported http methods are delete, get, patch, post and put.

Specifying input for a controller

var fooController = new ImmutableCoreController({
    paths: {
        '/foo/:bar': {
            get: {
                input: {
                    bar: 'params.bar',
                },
            },
        },
    },
})

Controllers do not have access to the express request object directly so input must be specified.

In this this example the value from '/foo/:bar' which is in the express request object under params.bar will be passed in the before and method args object as the property bar.

Specifying multiple input options

var fooController = new ImmutableCoreController({
    paths: {
        '/foo/:bar': {
            post: {
                input: {
                    bam: ['query.bam', 'body.bam'],
                },
            },
        },
    },
})

In this example an array is used to specify multiple locations where the bam argument may be fetched from. The first location with a value defined will be used.

Controller Options

Property	Type	Description
after	function	called after executing `method`
before	function	called before executing `method`
input	object	properties from request mapped to args
method	function	primary controller function
methodName	string	ImmutableCore method name
role	string	role that controller will be used for

input

The input object specifies a map of argument names to the location of that argument in the express http request object. Input can be pulled from any location in the request object (e.g. params, query, body, headeres, cookies).

A single path can be specified with a string or a list of paths can be given with an array. If multiple locations for input are specified then the first one with a defined value will be used.

method, before and after

Typically a controller will have at least a primary method and for more complex controllers it can be beneficial to break functionality into separate methods.

Default controllers follow the pattern of doing any server side data loading in the before method, doing processing of input and loaded server data in the primary method and leaving the after method open for customization.

methodName

The methodName can be specified and if not it will be created automatically.

If the function set for method has a name then that name will be used. Otherwise the path and the http method with non alpha characters removed will be used.

role

With the ImmutableApp framework the same route and HTTP method can be served with different controllers based on the users role(s).

The controller will only be served to sessions with the specified role.

immutable-core-controller

immutable-core-controller