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-=head1 External custom fields
-
-=head2 Description
-
-C<External custom fields> is extension to custom fields that allow
-you to define CF with a dynamic list of values. Loading values into
-this custom fields requires writing a little Perl code to fetch the
-data from the external source; the code that we added to RT 3.7
-allows it to load data from arbitrary external sources.
-
-=head2 Introduction into writing source of values
-
-For each type of data source that you want, you'll need to put a file
-in F</opt/rt3/local/lib/RT/CustomFieldValues/> (or equivilent if you
-installed RT someplace other than F</opt/rt3>). To get a sense of the
-code that you'll need to write, take a look at the code in 
-L</opt/rt3/lib/RT/CustomFieldValues/Groups.pm> for a simple example
-which just uses RT's API to pull in a list of RT's groups.
-
-Running C<perldoc /opt/rt3/lib/RT/CustomFieldValues/External.pm> will
-show you the documentation for the API that needs to be fulfilled, by
-copying and editing the C<Groups> example is probably a fine place to
-start.
-
-Later in this doc we'll describe the example a little bit more.
-
-=head2 Configuration
-
-After the custom code is written, you need to tell RT about its
-existence by adding something like following to your RT_SiteConfig.pm:
-Set(@CustomFieldValuesSources, "RT::CustomFieldValues::MySource");
-
-The value in quotes should be the name of the class that you created.
-
-Stop and start your web server to enable any config changes. Open the web interface with
-as an administrative user (such as root) create new custom field. In order to use
-a custom source of values, you should select a custom field type
-that lets users pick values from a list, for example it could be C<Select *>
-or a type with autocompletion. It shouldn't be C<Enter one value> type
-as this type doesn't allow user to choose values. Other types that
-don't have a defined list of values are also unacceptable.
-
-Save the changes, now you have ability to select a "source" for values.
-Choose the class you wrote from the list and save changes.
-
-=head2 How to write custom source
-
-You have to implement a subclass of L<RT::CustomFieldValues::External>.
-There are two main methods you want to override:
-
-=over 4
-
-=item SourceDescription
-
-This method should return a string describing the data source; this is
-the identifier which the adimistrator will see in the dropdown in the web
-interface. See L</Configuration>.
-
-=item ExternalValues
-
-This method should return an array reference of hash references.  The
-hash references should contain keys for C<name>, C<description>, and
-C<sortorder>. C<name> is most important one. The others are optional
-
-=back
-
-Here's a simple static example:
-
-  package RT::CustomFieldValues::MySource;
-  
-  # define class inheritance
-  use base qw(RT::CustomFieldValues::External);
-
-  # admin friendly description, the default valuse is the name of the class
-  sub SourceDescription {
-      return 'My Source';
-  }
-  
-  # actual values provider method
-  sub ExternalValues {
-      # return reference to array ([])
-      return [
-          # each element of the array is a reference to hash that describe a value
-          # possible keys are name, description and sortorder
-          { name => 'value1', description => 'external value', sortorder => 1 },
-          { name => 'value2', description => 'another external value', sortorder => 2 },
-          # values without description are also valid, the default description is empty string
-          { name => 'value3', sortorder => 3 },
-          # you can skip sortorder too, but note that the default sortorder is 0 (zero)
-          { name => 'value3' },
-      ];
-  }
-  
-  1; # don't forget to return some true value
-
-That's all. Install and configure your class as described in the L</Configuration> section.
-