Goal

Use the available NocoBase data-modeling surface to inspect and change collections, fields, relations, and view-backed schemas.

Prefer the transport in this order:

the nb api data-modeling CLI whenever it is available
another equivalent data-modeling transport only when the CLI is unavailable and it exposes the same operation surface

Do not make the skill depend on one executable name. Treat CLI command names and equivalent wrappers as transport details around the same modeling operations.

Transport-selection rule:

Check whether the nb api data-modeling CLI is available in the current environment.
If it is available, use the CLI.
If the CLI is available but not authenticated for the target app, stop and guide the user to authenticate the CLI.
Only fall back to another equivalent transport when the CLI itself is unavailable.

Read references/decision-matrix.md first when the request is broad or the correct modeling path is unclear.

Mandatory Gates

Confirm the chosen data-modeling transport is reachable and authenticated before any write operation. If nb api data-modeling CLI is available, that should be the chosen transport.
For plugin-backed tables or fields, read references/plugin-provided-capabilities.md before mutating schema.
For view collections, verify the upstream database view exists with db-views list|get before creating or updating anything.
Before using a CLI modeling command you have not used yet in the current task, run its --help once and follow the generated help text for flags and examples. When CLI is unavailable and another non-CLI transport must be used, inspect its exposed parameter schema before first use.

Stop and ask the user to fix auth when the chosen transport returns 401, 403, Auth required, or equivalent access errors. If the chosen transport is nb api data-modeling CLI, guide the user to restore CLI authentication rather than switching transports.

Final Command Surface

Use only this final data-modeling operation surface:

Inspect collections: collections list
Inspect one collection: collections get
Inspect fields in one collection: collections fields list
Create or update a collection with compact payload: collections apply
Create or update fields with compact payload: fields apply
Delete a collection: collections destroy
Inspect database views: db-views list|get

When the transport is CLI-based, prefer learning exact flags from help instead of keeping large command-shape reminders in prompt context:

nb api data-modeling collections apply --help
nb api data-modeling collections fields list --help
nb api data-modeling fields apply --help
nb api data-modeling collections destroy --help

Do not prefer older low-level collection or nested field commands when the final command surface can handle the task.

Core Rules

Decide collection type first. Never infer general, tree, file, calendar, sql, view, or inherit from the name alone.
If the user explicitly asks for a file table, file collection, template: "file", or uses wording such as "文件表", "合同文件", "扫描件", "证书文件", or "the file itself is the record", treat that as a binding collection-type requirement and choose template: "file" first.
Do not reinterpret a file-first request as a general collection just because extra metadata fields are also needed.
Prefer the compact payloads supported by collections apply and fields apply. Let the server fill derived defaults.
Do not guess special capabilities. Check references first for plugin-backed fields, relation variants, special collection types, and view-backed models.
Relations come after the base collection and scalar fields are correct.
Prefer collections get for routine post-mutation read-back. Use the verification result returned by collections apply when normalized diagnostics are needed.
If the requested behavior cannot be expressed through the final command surface in the chosen transport, stop and explain what is missing instead of silently falling back to an older path.

Compact Payload Rules

When creating a collection with collections apply, do not send built-in system fields such as id, createdAt, createdBy, updatedAt, updatedBy, or template-owned structural fields unless the current command help explicitly says they are required.
For general, tree, file, and other built-in templates, assume the server will create the template defaults. Only send business fields that the user is actually adding.
For file, do not manually send built-in fields such as title, filename, extname, size, mimetype, path, url, preview, storage, or meta unless the task is explicitly customizing one of those existing fields on an already-created collection.
For tree, do not manually include parentId, parent, or children in the compact create payload unless you are intentionally overriding an existing schema with a fully expanded raw shape.
Every custom field supplied to collections apply or fields apply still needs an explicit interface. The compact API reduces derived options, but it does not infer business field interfaces from the field name alone.
For local choice fields passed through collections apply or fields apply (select, multipleSelect, radioGroup, checkboxGroup), every enum item must be an object with explicit value, label, and color. Do not use string shorthand such as ["draft", "paid"].
Allowed choice colors are red, magenta, volcano, orange, gold, lime, green, cyan, blue, geekblue, purple, and default.
Usually do not pass type. Let the server derive it from interface. Only pass type when the current command help or a reference explicitly requires it.
Unknown interface values now fail fast. If the correct interface is unclear, stop and inspect references or command help instead of guessing.
If you choose a plugin-backed interface such as vditor, formula, map geometry fields, or special relation fields, confirm the plugin-backed capability first.
If a reference file shows a fully expanded collection JSON, treat it as structure reference or read-back reference, not as the preferred compact apply payload.

Default Interface Bias

Prefer the common built-in interface first when the user does not request a plugin-specific editor or behavior.
For long-form plain text without markdown semantics, prefer textarea.
For markdown content, prefer vditor first when the plugin capability is available.
Only fall back from vditor to ordinary markdown when the plugin is unavailable or the user explicitly wants the simpler markdown field.
Do not add tableoid unless the user explicitly asks for that system-info field.
For map fields, use the exact interface requested by the spatial requirement, such as point, lineString, circle, or polygon. Do not collapse them into generic json or text.

Formula Rule

For formula, do not invent expressions from memory.
Read references/fields/plugins/formula.md first.
Choose the engine first, then write the expression in that engine's syntax.
In compact payloads, prefer only the parameters that are actually needed, usually name, title, interface, expression, and optional engine or dataType.
If the intended engine or syntax is unclear, stop and ask instead of guessing.

Relation Key Rule

For relation fields, read references/relation-fields.md before mutation.
If the relation should be stable and readable, pass explicit keys such as foreignKey, through, otherKey, sourceKey, and targetKey instead of relying on generated defaults.
Treat generated key names as fallback behavior, not as the preferred modeling result.

Working Process

1. Inspect

Start with collections list or collections get.
When you need the current field set of one collection, use collections fields list.
When the request involves a view-backed model, inspect db-views list|get first.
In CLI flows, run the relevant command --help before first use in the current task.
For broad modeling tasks, load the matching references before writing.

2. Decide the model

Before writing, determine:

what the collection represents;
which collection type is correct;
which fields are required;
whether relations are needed;
whether any plugin capability is required;
what verification output will prove the result is correct.

Summarize the intended model in natural language before destructive or broad changes.

3. Apply

Use collections apply for collection-level creation or updates.
Use fields apply for targeted field creation or updates.
Use collections destroy only for explicit delete requests.

Compact payloads are preferred. Supply only the fields the command contract requires, such as collection template/name/title and field name/title/interface, plus any necessary special options that cannot be derived safely.

For collection creation, this usually means:

collection-level options such as name, title, template, and a small number of template-specific flags;
business fields only, not default system/template fields;
relation-specific options only when the field interface is relational.

4. Verify

After each mutation, usually read back with collections get. When normalized diagnostics are needed, rely on the verification result returned by collections apply.

Confirm:

the collection type is correct;
the expected fields exist with the right interface/type/title;
relation ownership and reverse behavior are correct when relations were changed;
special collections still satisfy their source constraints.

Reference Loading

Load only the references needed for the active task:

Collection type choice: references/collection-types/index.md
Field family and supported options: references/field-capabilities.md
Relations: references/relation-fields.md
Plugin-backed capabilities: references/plugin-provided-capabilities.md
Whole-schema examples after lower-level decisions: references/model-packs/*.md
Verification order and template-specific checks: references/verification-playbook.md

After opening an index file, continue only into the matching subtype file that is actually in scope.

Collection Type Safeguards

general: ordinary business records.
tree: hierarchical data.
file: file-centric records where the file is first-class.
calendar: schedule-oriented objects.
sql, view, inherit: only after capability and prerequisites are confirmed.

Do not emulate tree or file with weaker general-table substitutes unless the user explicitly asks for that tradeoff.

Explicit override rule:

If the request contains "file collection", "file table", "文件表", or equivalent wording that makes the file the primary record, this overrides any default bias toward general.
When the request mentions contracts as managed files, scanned documents, certificates, invoices, archives, or uploaded document records, default to file unless the user explicitly says the file is only a subordinate attachment on another business table.

Field and Relation Safeguards

Use references/field-capabilities.md as the source of truth for interface support.
Do not guess plugin-backed interfaces such as region, special media, or custom relation capabilities.
Use references/relation-fields.md before creating or changing relations.
Verify both sides after relation changes, because reverse fields or keys may be created as side effects.

Error Handling

400 or 422: inspect the payload, then correct collection type, field interface, missing required options, enum shape, missing/invalid enum colors, or relation keys before retrying.
Auth errors: stop and ask the user to restore access for the chosen transport.
Missing plugin or view prerequisite: stop and tell the user exactly what is missing.

Reference Index

Topic	File
Collection type selection	`references/collection-types/index.md`
Field capability matrix	`references/field-capabilities.md`
Relation overview	`references/relation-fields.md`
Plugin-backed modeling capabilities	`references/plugin-provided-capabilities.md`
Whole-schema examples	`references/model-packs/*.md`
Verification order and checks	`references/verification-playbook.md`
Decision helper	`references/decision-matrix.md`

nocobase-data-modeling