Migrate Conditions

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Back-office Migration Migrate Plugins

Release

Description

Overview

Add logic to your process pipeline with Migrate Conditions.

This project provides a framework of condition plugins exclusively for use with the Migrate API. The module then provides a number of process plugins that can leverage the conditions.

Process plugins

• skip_on_condition
• evaluate_condition
• if_condition
• first_meeting_condition
• filter_on_condition
• switch_on_condition

This project began as an ambitious solution to #3259591: Add generic Skip migrate process plugin with various operations.

Requirements

Core migrate module.

Recommended modules

Migrate Condition plugins

There are three rough categories of condition plugins included.

"Primary" Condition Plugins

These are the ones you will use the most. They do not require any other condition plugins to work.

• callback
• contains
• default
• empty
• entity_exists
• equals
• greater_than
• in_array
• in_migrate_map
• is_null
• is_stub
• isset
• less_than
• matches
• older_than

"Logical" Condition Plugins

These conditions allow the primary conditions to be composed (that is, AND-ed and OR-ed)

• and
• or

"Array-Handling" Condition Plugins

These conditions allow another condition to be evaluated on each element of an array.

• all_elements
• has_element

Examples

1. Skip a row is a certain source value is NOT empty.

@see skip_on_condition, empty

process:
  skip_on_not_empty:
    plugin: skip_on_condition
    condition: 
      plugin: empty
      negate: true
    method: (row/process)
    source: my_source

Or negation can be done more concisely by prefixing the condition plugin id with not::

process:
  skip_on_not_empty:
    plugin: skip_on_condition
    condition: not:empty
    method: (row/process)
    source: my_source

Since the not:empty condition does not require any further configuration, we were able to simply pass the plugin id as the condition.

Whether you negate a condition using not: or by setting negate: true is a matter of personal preference. For conditions plugins that require no additional configuration (like empty or is_null) it's much more concise to use the not: prefix.

Beginning with v2.1.0, we can alternatively specify the source directly on the condition. Thus the previous example could be written as:

process:
  skip_on_not_empty:
    plugin: skip_on_condition
    condition: 
      plugin: not:empty
      source: my_source
    method: (row/process)

Specifying the source on the condition is not especially useful in this case, but in other cases it may come in handy.

2. Filter old dates out of a source array of timestamps. That is, keep dates that are not older than now.

@see filter_on_condition, older_than

process:
  future_timestamps:
    plugin: filter_on_condition
    source: source_array_of_timestamps
    condition:
      plugin: older_than
      negate: true
      format: 'U'
      value: now

3. Set a boolean to true if a source_age is between 13 (inclusive) and 20 (not inclusive).

@see evaluate_condition, and, less_than

process:
  is_a_teenager:
    plugin: evaluate_condition
    source: my_source_age
    condition: 
      plugin: and
      conditions:
        -
          plugin: not:less_than
          value: 13
        -
          plugin: less_than
          value 20

Some conditions support parens to pass a value. The example above is written more succinctly below.

process:
  is_a_teenager:
    plugin: evaluate_condition
    source: my_source_age
    condition: 
      plugin: and
      conditions:
        - plugin: not:less_than(13)
        - plugin: less_than(20)

4. Use source_value_backup if source_value is empty, This is a powerful alternative to default_value.

@see if_condition, empty

process:
  destination_value:
    plugin: if_condition
    source: source_value
    condition: empty
    do_get: source_value_backup
    else_get: source_value

or equivalently

process:
  destination_value:
    plugin: if_condition
    source: source_value
    condition: not:empty
    else_get: source_value_backup

5. Return the first source value that is not empty, like an "empty coalesce" plugin would.

@see first_meeting_condition, empty

process:
  some_not_empty_value:
    plugin: first_meeting_condition
    condition: not:empty
    source:
      - something
      - another
      - you_get_the_idea

6. Determine whether a number is negative, positive, or zero.

@see switch_on_condition, less_than, equals, default

process:
  sign_string:
    plugin: switch_on_condition
    source: my_source_number
    cases:
      -
        condition: less_than(0)
        default_value: negative
      -
        condition: equals(0)
        default_value: zero
      -
        condition: default
        default_value: positive

The use of parens notation, shown above, can make the yaml very simple.

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