Dynamic forms (eav)

Dynamic forms (eav)configurationeav

TODO: Introduction

Dynamic forms are used for:

extending standard entity attributes with custom, project specific attributes,
dynamic configurations - e.g. system connector configurations.

Dynamic forms are supported for selected entities:

SysSystem - linked to the systems
IdmIdentity - identities
IdmIdentityContract - Contractual relationships
IdmRole - roles
IdmTreeNode - tree structure items.

Dynamic form instances (values) are saved in the individual tables according to the entity which they are linked to ⇒ which is their owner (e.g. the entity IdmIdentityForlmValue, IdmRoleFormValue).

FormService service for working with the extended attributes on the back-end.

On the front-end, the editing of dynamic forms is done by the component EavForm.

Dynamic form attribute supports data types (persistentType):

CHAR - one character
TEXT - strings
INT - integer
LONG - long
DOUBLE - saved as bigdecimal
BOOLEAN - true / false / null
DATE - date (without time)
DATETIME - date with time
BYTEARRAY - byte[]
UUID - uuid identifier

with properties:

required
readonly
multi values - Is represented on the front-end by a textarea, where a line is a value (a new line separates the values). This property is supported for persistent types CHAR, TEXT, INT, LONG, DOUBLE and UUID.
confidential - .The values are stored in an confidential storage). Stored values of these attributes - substitute characters only - are loaded on the front-end. The value can only be changed and determined whether it is filled in. This property is supported for persistent types CHAR, TEXT, INT, LONG, DOUBLE, UUID, BYTEARRAY.

Dynamic form attribute can be rendered differently on frontend. Face type (faceType) property is used for choosing frontend renderer. Default renderer is chosen by persistent type (e.g. UUID → UUID).

Renderer is frontend component, superclass component AbstractFormAttributeRenderer is used for all renderer implementations. Renderer is responsible for IdmFormValue ⇔ input value transformation.

Renderers are registered in module's component-descriptor.js as single component with attributes:

id - unique component identifier
type = form-value - static component type is used for all form-value renderer
persistentType - which persistent type renderer supports
faceType - renderer face type ⇒ key. Unique face type should be given (by persistent type). Its optional persistentType is used as default, when no faceType is given.
component - renderer implementation (AbstractFormAttributeRenderer descendant).
labelKey - localization key ⇒ renderer name. Its optional, faceType is used, when no labelKey is given.

All component descriptor features are supported. Read tutorial, how to create custom form attribute renderer.

Adding the support of extended attributes for a new entity

Backend

Adding an interface implementation FormableEntity to the new entity,
creating a manager implementation by inheriting AbstractFormableService for the new entity,
creating the entity by inheriting AbstractFormValue, which will represent the values of extended attributes for the new entity (owner),
creating a repository by inheriting AbstractFormValueRepository for the values of the extended attributes,
creating the manager by inheriting AbstractFormValueService for the values of the extended attributes.

Frontend

issuing a REST endpoint for saving the extended attributes from the FE - e.g. IdmIdentityController - controller has to evaluate security to read / save form values by their owner (e.g. by identity),
creating a service and redux manager communicating with REST by inheriting FormableEntityManager - e.g. IdentityManager,
using the component EavForm for filling in and sending the values of the extended attributes from the FE to the BE - e.g. IdentityEav content.

Agenda for working with forms

On the FE, there is an agenda of forms - their definition and attributes. Each definition can contain zero or more attributes. To maintain the integrity, an interface UnmodifiableEntity has been created, which allows adding a flag that the entity has been created by the system and cannot be modified (or some of its attributes) and deleted (this logic now needs to be implemented manually into the relevant controllers), for example in IdmFormAttributeController.

It is necessary to be cautious when editing individual form attributes as the logic linked to this form can be rendered non-functional.

Data migration, when attribute's persistentType is changed is not supported now.

Future development

API for saving the owner and the eav form in one transaction (⇒ save IdmFormInstance).
Attribute properties validation - by supported persistent type (see above).
Form value data migration, when persistent type is changed.
Split TEXT and LONGTEXT persistent type - TEXT will be indexed varchar(xxx).

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