---
name: orbites-obsidian-bases
description: Create and edit Obsidian Bases (.base files) — database-like views with filters, formulas, and summaries. Use when working with .base files in OrbitOS.
---
# OrbitOS: Obsidian Bases Reference

Obsidian Bases are YAML files (`*.base`) that define dynamic views of notes.

## Schema

```yaml
filters:          # Global: single filter string, or and/or/not nesting
formulas:         # Computed properties (e.g., days_old: "((now() - file.ctime) / 86400000).round(0)")
properties:       # Display names
summaries:        # Custom summary formulas
views:            # Array of view definitions
  - type: table|cards|list|map
    name: "View Name"
    filters:      # View-specific filters
    order:        # Columns to display
    groupBy:      # Group settings
```

## Filter Syntax

```yaml
# Simple
filters: 'status == "done"'

# AND
filters:
  and:
    - 'status == "done"'
    - 'priority > 3'

# OR, NOT, NESTED
filters:
  or:
    - file.hasTag("tag")
    - and:
        - file.hasTag("book")
        - file.inFolder("Folder")
```

## Built-in Properties

- **File**: `file.name`, `file.basename`, `file.path`, `file.folder`, `file.ext`, `file.size`, `file.ctime`, `file.mtime`, `file.tags`, `file.links`, `file.backlinks`
- **Frontmatter**: Any frontmatter key (e.g., `status`, `priority`)
- **Formulas**: `formula.my_formula`

## Functions

- **Global**: `date()`, `now()`, `today()`, `if()`, `min()`, `max()`, `link()`
- **String**: `contains()`, `startsWith()`, `endsWith()`, `lower()`, `replace()`, `split()`
- **Number**: `abs()`, `ceil()`, `floor()`, `round()`, `toFixed()`
- **List**: `contains()`, `filter()`, `map()`, `reduce()`, `join()`, `sort()`, `unique()`
- **File**: `hasLink()`, `hasTag()`, `hasProperty()`, `inFolder()`
- **Date**: `format()`, `relative()`, arithmetic with durations