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1>TimHunt в 12:33, 5 марта 2009

2009-03-05T12:33:39Z

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{{Question development}}

==Importing or exporting questions==

Questions coming from other Moodle courses or from other e-learning systems (i.e. Blackboard, Webct etc.) can be imported in Moodle.
Similarly, Moodle offers a process to export questions to other systems in different format ( XML, QTI etc.).
The import and export code is mostly written in format.php files located in a directory specific to the type of format files from which the import or export is done.

* examples:
** '''question/format/aiken/format.php'''
** '''question/format/blackboard/format.php'''
** '''question/format/qti2/format.php'''
** '''question/format/xml/format.php'''
there is a default class qformat_default defined in '''question/format.php''' and the process is controlled by
* '''question/import.php'''
* '''question/export.php'''

Import/Export formats are a pluggable resource and will automatically be "discovered" and made available to users simply by adding the plugin to question/format. Cross-support for optional questiontype plugins was added in 1.9 and support for language files (specifically a help file) has been implemented in Moodle 2.0.

=== Developing an import/export plugin ===

The simplest and most comprehensive import/export type is probably the Moodle XML format. There are also a few option plugins in contrib (plugins/question/format) that you can look at. It is worth studying these file (question/format/xml/format.php) along with the parent class (question/format.php) to get an understanding of what is going on. Some other custom formats circumvent the normal rules and structure and should be studied with caution.

Some things to note:
* Study the question/format.php file to establish which methods must be overridden.
* Each format.php file can support import, export or both indicated by the '''provide_import()''' and '''provide_export()''' methods which must be overridden to return ''true'' as required.
* Do not read or write directly to the database, this is handled for you by the parent class
* when importing, question objects need to be in a format suitable for use by the questiontype->save_options() method (see question/type/questiontype.php class). The easiest way to get this information is to do a '''print_r($question);''' at the start of the '''save_options()''' method for the appropriate question type when a question is saved. The imported object must be the same format.
* when importing, always obtain 'empty' question objects from the '''defaultquestion()''' method, which sets all required properties to their default values.
* for exporting the populated $question object is supplied to the format class. Again, '''print_r($question)''' can be used to learn the format.
* You should add a help file for the plugin using the structure lang/en_utf8/help/''myformat''/''myformat''.html where ''myformat'' is the name of your import/export plugin (Moodle 2.0).

== See also ==
[https://docs.moodle.org/en/Lesson#Types_of_questions_available_within_a_lesson Lesson question types] - both Lesson and Quiz can import the basic Moodle question types.

[[Category:Developer|Question import/export formats]]
[[Category:Quiz]]
[[Category:Lesson]]

Development:Question import/export formats - История изменений

Олег Давидович: 1 версия импортирована

1>TimHunt в 12:33, 5 марта 2009