Compact

Transform Mezmo Compatible

Synopsis

Removes null values, empty strings, empty arrays, and empty objects recursively.

Schema

compact:
  - description: <text>
  - if: <script>
  - ignore_failure: <boolean>
  - on_failure: <processor[]>
  - on_success: <processor[]>
  - tag: <string>
  - values: <array>

Configuration

Field	Required	Default	Description
description	N	-	Explanatory note
if	N	-	Condition to run
ignore_failure	N	false	See Handling Failures
on_failure	N	-	See Handling Failures
on_success	N	-	See Handling Success
tag	N	-	Identifier
values	N	-	Array of values to be removed when found, in addition to empty fields

Details

Empty fields include null values, empty strings, empty arrays [], and empty objects {}. This processor helps reduce the document size and improve readability by eliminating all the unnecessary fields.

note

The processor is particularly useful for cleaning up documents before storage or transmission, reducing storage space and network bandwidth usage.

Examples

Basic Usage

Remove empty fields from document...	{ "name": "document1", "tags": [], "metadata": {}, "description": "", "status": null, "value": 42 } compact: - description: "Remove empty fields"
resulting in only non-empty fields:	{ "name": "document1", "value": 42 }

Nested Objects

Process nested objects recursively...	{ "user": { "name": "John", "settings": { "theme": "", "notifications": {}, "preferences": { "language": "en" } }, "groups": [] } } compact: - description: "Clean user data"
removing empty fields at all levels:	{ "user": { "name": "John", "settings": { "preferences": { "language": "en" } } } }

Remove Specific Values

Remove empty fields and...	{ "status": "pending", "priority": "low", "tags": ["draft", "review", ""], "metadata": {} } compact: - values: ["low", "draft"]
specific values:	{ "status": "pending", "tags": ["review"] }

Conditional Execution

Compact only when a condition is met...	{ "type": "user", "data": { "id": "123", "roles": [], "settings": {} } } compact: - if: "ctx.type == 'user'"
only user documents are compacted:	{ "type": "user", "data": { "id": "123" } }