Apostrophe 3 Documentation

# array

An array field has its own field schema and allows the user to add one or more entries that use the fields in that schema. The overall field is stored in the database as an array of an object for each entry.

This is useful for collections of structured data that clearly belong to a parent document but won't have relationships to other documents, such as multiple sets of contact information for business locations or tabs in a widget.

See the relationship field if you exclusively, or primarily, need to indentify a series of other pieces or pages.

# Module field definition

// Configuring the `contactInfo` array field in a module's `fields.add` subsection:
contactInfo: {
  label: 'Contact information',
  type: 'array',
  titleField: 'city',
  fields: {
    add: {
      city: {
        type: 'string',
        label: 'City'
      },
      email: {
        type: 'email',
        label: 'Email address'
      }
    }
  }
}

# Settings

# Required

Property Type Default Description
label String n/a Sets the visible label for the field in the UI
type String n/a Specifies the field type (array for this type)
fields Object n/a The field schema for the array items. See below.

# Optional

Property Type Default Description
def Array n/a The default value for the field. It must comply with the array fields schema.
help String n/a Help text for the content editor
htmlHelp String n/a Help text with support for HTML markup
if Object {} Conditions to meet before the field is active. See the guide for details.
min Integer n/a The minimum number of entries required in the array
max Integer n/a The maximum number of entries allowed in the array
required Boolean false If true, the field is mandatory
readOnly Boolean false If true, prevents the user from editing the field value
titleField String n/a The name of one of the array schema fields. If provided, the user interface will use the value of that field as a label for the array tabs.

NOTE

  • If there is no titleField value, the items are numbered.
  • Setting titleField is recommended to improve clarity for content editors.
  • titleField can access relationship sub-field documents by using dot notation (e.g., _team[0].mascot).

# Configuring the array field schema

Array field schemas are generally configured the same way as the module's overall field schema is configured. The module's schema is configured in its fields section's add subsection. Similarly, array field schema are configured in a fields property, using its add subproperty to configure the actual fields. Both use the field names as keys in the add object. Both can contain all field types, including nested array fields.

Array schema configuration differs from module schema configuration in that array schemas do not use group or remove settings.

# Use in templates

Nunjucks provides the {% for %} template tag (opens new window) to loop over arrays. This is the most common way to traverse the array field data and sub-fields.

<ul>
{% for contact in data.piece.contactInfo %}
  <li>{{ contact.city }}: {{ contact.email }}</li>
{% endfor %}
</ul>

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