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Workflow-2.09
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/ Workflow::Persister::DBI::ExtraData

NAME

Workflow::Persister::DBI::ExtraData - Fetch extra data with each workflow and put it into the context

VERSION

This documentation describes version 2.09 of this package

SYNOPSIS

persister:
- name: MyPersister
  class: Workflow::Persister::DBI::ExtraData
  dsn: DBI:mysql:database=workflows
  user: wf
  password: mypass
  extra_table: workflow_ticket
  extra_data_field: ticket_id
  extra_data_context_key: ticket_id

DESCRIPTION

Overview

Simple subclass of Workflow::Persister::DBI to allow you to declare an extra table and data field(s) from which to fetch data whenever you fetch a workflow. There is a simple restriction: the table must have a field 'workflow_id' of the same datatype as the 'workflow_id' field in the 'workflow' table.

Examples

# Specify a single field 'ticket_id' from the table 'workflow_ticket'
# and store it in the context using the same key:

persister:
- name: ...
  extra_table: workflow_ticket
  extra_data_field: ticket_id
  ...

# How you would use this:
my $wf = FACTORY->fetch_workflow( 'Ticket', 55 );
print "Workflow is associated with ticket: ",
      $wf->context->param( 'ticket_id' );

# Specify a single field 'ticket_id' from the table 'workflow_ticket'
# and store it in the context using a different key

persister:
- name: ...
  extra_table: workflow_ticket
  extra_data_field: ticket_id
  extra_context_key: THE_TICKET_ID
  ...

# How you would use this:
my $wf = FACTORY->fetch_workflow( 'Ticket', 55 );
print "Workflow is associated with ticket: ",
      $wf->context->param( 'THE_TICKET_ID' );

# Specify multiple fields ('ticket_id', 'last_viewer',
# 'last_view_date') to pull from the 'workflow_ticket' table:

persister:
- name: ...
  extra_table: workflow_ticket
  extra_data_field: ticket_id,last_viewer,last_view_date
  ...

# How you would use this:
my $wf = FACTORY->fetch_workflow( 'Ticket', 55 );
print "Workflow is associated with ticket: ",
      $wf->context->param( 'ticket_id' ), " ",
      "which was last viewed by ",
      $wf->context->param( 'last_viewer' ), " on ",
      $wf->context->param( 'last_view_date' );

Configuration

extra_table (required)

Table where the extra data are kept.

extra_data_field (required)

Can be a single field or a comma-separated list of fields, all in the same table. If a single field specified you have the option of declaring a different extra_context_key under which the value should be stored in the workflow context. Otherwise the values are stored by the field names in the workflow context.

extra_context_key (optional)

Key under which to save the data from extra_data_field in the workflow context.

Note: this is ignored when you specify multiple fields in extra_data_field; we just use the fieldnames for the context keys in that case. And if you specify a single data field and do not specify a context key we also use the data field name.

METHODS

init ( \%params )

Initializes persister for extra workflow data.

Throws Workflow::Exception if initialization is not successful.

fetch_workflow ( $wf_id )

Fetches extra data from database and adds it to the restored workflow context data returned with the fetched workflow.

Throws Workflow::Exception if retrieval is not successful.

COPYRIGHT

Copyright (c) 2003-2021 Chris Winters. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Please see the LICENSE

AUTHORS

Please see Workflow