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230 lines
10 KiB
230 lines
10 KiB
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# Group Forms
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This API provides forms as a concept to aid in editing or creating resources. The goal of forms is to:
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* make writable properties of a resource discoverable
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* show to which values a property can be set
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* validate changes to a resource and indicate validation errors
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These benefits aside, a client can freely choose to immediately edit a resource without prior validation by a form.
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In the case of an invalid request the edit will fail and return appropriate errors nevertheless.
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A form is associated to a single resource and aids in performing changes on that resource.
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When posting to a form endpoint with an empty request body or an empty JSON object,
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you will receive an initial form for the associated resource.
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Subsequent calls to the form should contain a single JSON object as described by the form.
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## Actions
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| Link | Description | Condition |
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|:-------------------:| --------------------------------------------------------------------- | -------------------------------- |
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| validate | Validate changes, show errors and allowed values for changed resource | |
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| commit | Actually perform changes to the resource | form content is valid |
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| previewMarkup | Post markup (e.g. textile) here to receive an HTML-rendered response | |
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## Linked Properties
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| Link | Description | Type | Nullable | Supported operations |
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|:-------------------:| ------------------------------------------------ | ------------- | -------- | -------------------- |
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| self | This form | Form | | READ |
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## Embedded Properties:
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Apart from the linked properties, forms contain always three other embedded properties:
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* `payload`
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* `schema`
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* `validationErrors`
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Their purpose is explained below.
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### Payload
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The payload contains an edited version of the resource that will be modified when commiting the form.
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This representation contains all writable properties of the resource and reflects all changes that the latest call to **validate** included,
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thereby acting as a preview for the changes.
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In case the client tries to set the value to something invalid, the invalid change is also reflected here. However a validation error (see below)
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indicates that a commit of this payload would fail.
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It might happen that setting one property affects the allowed values for another property. Thus by changing a property A
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the current value of another property B might become invalid. If the client did not yet touch the value of B, the payload will
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contain a default value for that property. Nevertheless the client will also receive an apropriate validation error for value B.
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The content of this element *can* be used as a template for the request body of a call to **validate** or **commit**.
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A call to **validate** and **commit** does not need to include all properties that were defined in the `payload` section.
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It is only necessary to include the properties that you want to change, as well as the `lockVersion` if one is present.
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However you *may* include all the properties sent in the `payload` section.
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### Schema
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The schema embedded in a form is a normal [schema describing the underlying resource](#schema).
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However, the embedded schema can change with each revalidation of the form.
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For example it might be possible, that changing the type of a work package affects its available properties,
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as well as possible values for certain properties.
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As this makes the embedded schema very dynamic, it is not included as a static link.
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### Validation Errors
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Like a [schema](#schema) the validation errors build a dictionary where the key is a property name.
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Each value is an error object that indicates the error that occured validating the corresponding property.
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There are only key value pairs for properties that failed validation, the element is empty if all validations succeeded.
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However note that even in the case of validation errors, the response you receive from the form endpoint will be an HTTP 200.
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That is because the main purpose of a form is helping the client to sort out validation errors.
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## Example Form [/api/v3/example/form]
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+ Model
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+ Body
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{
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"_links": {
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"self": { "href": "/api/v3/example/form" },
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"validate": {
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"href": "/api/v3/example/form",
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"method": "POST"
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},
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"previewMarkup": {
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"href": "/api/v3/render/textile",
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"method": "POST"
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},
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"commit": {
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"href": "/api/v3/example",
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"method": "PATCH"
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}
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},
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"_type": "Form",
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"_embedded": {
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"payload": {
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"_links": {
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"status": { "href": "/api/v3/statuses/1" }
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},
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"_type": "Example",
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"lockVersion": 5,
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"subject": "An example title"
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},
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"schema": {
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"_type": "Schema",
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"_links": {
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"self": { "href": "/api/v3/example/schema" }
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},
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"lockVersion": {
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"type": "Integer",
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"writable": false
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},
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"subject": {
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"type": "String",
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"minLength": 1,
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"maxLength": 255
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},
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"status": {
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"_links": {
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"allowedValues": [
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{ "href": "/api/v3/statuses/1", "title": "New" },
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{ "href": "/api/v3/statuses/2", "title": "Closed" }
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]
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},
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"type": "Status",
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"_embedded": {
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"allowedValues": [
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{
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"_links": { "self": { "href": "/api/v3/statuses/1" } },
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"_type": "Status",
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"id": 1,
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"name": "New",
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"position": 1,
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"isDefault": true,
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"isClosed": false,
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"defaultDoneRatio": 0,
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"createdAt": "2014-05-21T08:51:20Z",
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"updatedAt": "2014-05-21T09:12:00Z"
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},
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{
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"_links": { "self": { "href": "/api/v3/statuses/2" } },
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"_type": "Status",
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"id": 2,
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"name": "Closed",
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"position": 2,
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"isDefault": false,
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"isClosed": true,
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"defaultDoneRatio": 100,
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"createdAt": "2014-05-21T08:51:20Z",
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"updatedAt": "2014-05-21T09:12:00Z"
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}
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]
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}
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}
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},
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"validationErrors": {
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"subject": {
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"_type": "Error",
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"errorIdentifier": "urn:openproject-org:api:v3:errors:BadExampleError",
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"message": "For the purpose of this example we need a validation error. The remainder of the response pretends there were no errors."
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}
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}
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}
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}
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## show or validate form [POST]
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This is an example of how a form might look like. Note that this endpoint does not exist in the actual implementation.
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+ Request (application/json)
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{
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"lockVersion": 5,
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"_type": "Example",
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"subject": "An example title"
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}
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+ Response 200 (application/hal+json)
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[Example Form][]
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+ Response 400 (application/hal+json)
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Occurs when the client did not send a valid JSON object in the request body and the request body
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was not empty.
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Note that this error only occurs when the content is not at all a single JSON object.
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It **does not occur** for requests containing undefined properties or invalid property values.
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+ Body
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{
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"_type": "Error",
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"errorIdentifier": "urn:openproject-org:api:v3:errors:InvalidRequestBody",
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"message": "The request body was neither empty, nor did it contain a single JSON object."
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}
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+ Response 403 (application/hal+json)
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Returned if the client does not have sufficient permissions to modify the associated resource.
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+ Body
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{
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"_type": "Error",
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"errorIdentifier": "urn:openproject-org:api:v3:errors:MissingPermission",
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"message": "You are not allowed to edit example resources."
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}
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+ Response 409 (application/hal+json)
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Returned if underlying resource was changed since the client requested the form. This is determined using the `lockVersion` property.
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+ Body
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{
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"_type": "Error",
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"errorIdentifier": "urn:openproject-org:api:v3:errors:UpdateConflict",
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"message": "The resource you are about to edit was changed in the meantime."
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}
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