Logseq Schema

Logseq Schema

Overview

Use this skill to ground Datascript queries in Logseq's schema: core block/page/file attributes, built-in properties, built-in classes, and schema entities with :db/ident. Load references/logseq-datascript-schema.md for authoritative sources and query patterns, and references/logseq-datascript-query-examples.md for scenario-based query examples.

Glossary

• db/id: Internal numeric entity id (use with CLI flags like --id).
• :block/uuid: Stable UUID for a block entity; prefer when you need a persistent reference.
• :block/name: Lowercased page name, used for page lookup and joins.
• :block/title: Block or page title stored in the DB graph (use in queries when content text is needed).
• :block/tags: Ref-many attribute linking blocks to tag/page entities.
• :user.property/<name>: Namespace for user-defined properties stored directly on block entities.
• :logseq.property/*: Namespace for built-in properties stored directly on block entities.

Important Notes

• Never use following block attrs in query or pull, these attrs are file-graph only, never used in db-graphs: :block/format, :block/level, :block/level-spaces, :block/pre-block?, :block/properties-order, :block/properties-text-values, :block/invalid-properties, :block/macros, :block/file, :block.temp/ast-body, :block.temp/ast-blocks, :block/marker, :block/content, :block/priority, :block/scheduled, :block/deadline, :block/properties, :block/left.
• User properties are stored as :user.property/<name> attributes on the block/page entity.
• Pull selectors do NOT support namespace wildcards like :user.property/* or :logseq.property/*. Only * (all attributes) or explicit attributes are allowed in pull.
• To fetch user properties, either:
  • Query datoms and filter attributes by namespace (e.g., user.property), then merge into the entity map, or
  • Discover explicit user property idents (via :db/ident) and include them explicitly in the pull selector.
• Property values are often entities/refs (not always scalars). When rendering values, check for :block/title, :block/name, or :logseq.property/value on the value entity before falling back to stringifying.
• Many properties are :db.cardinality/many (values may be sets/vectors). Treat them as collections in queries and formatting.

Datascript Query Mistakes To Avoid

• In query :where/pull/find, attributes cannot use namespace wildcards (e.g., :logseq.property/*, :user.property/*); you must use full attr :db/ident values (e.g., :logseq.property/status, :user.property/background). In pull, only * (all attributes) is special.
• Avoid nesting function calls inside predicates in :where (some Datascript engines reject or mis-handle it). Bind the function result first, then compare.

Example of safe namespace filtering:

[:find [?a ...]
 :where
 [?e :db/ident ?a]
 [(namespace ?a) ?ns]
 [(= ?ns "user.property")]]

Workflow

1) Locate schema facts

• Open references/logseq-datascript-schema.md.
• Review the core attribute list and helper sets for ref/cardinality details.
• Review built-in properties and classes to understand available attributes and required fields.

2) Write or validate queries

• Prefer :block/* attributes for block/page queries; use properties/classes only when needed.
• If unsure about available :db/ident entities, run the CLI query listed in the references file.
• For user properties, query against :user.property/<name> directly; for built-ins, use :logseq.property/<name>.

3) Keep queries consistent with schema

• Respect ref vs scalar attributes and :db.cardinality/many when joining.
• Use property/class definitions to confirm public/queryable status before exposing a query to users.

Resources

references/

• logseq-datascript-schema.md
• logseq-datascript-query-examples.md

Quick Examples

Pull user properties for a block

;; Discover idents, then pull explicitly.
[:db/id :block/title :user.property/background :user.property/notes]

Query blocks with a user property

[:find ?b ?v
 :where
 [?b :user.property/background ?v]]

Render a property value

Order of preference when value is a map/entity:

1. :block/title
2. :block/name
3. :logseq.property/value