experience-lds-best-practices-apply

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Applying LDS Best Practices

Apply the Lightning Data Service guidelines to a Lightning Web Component. Three pillars: data consistency, referential integrity, and UIAPI vs Apex. Focused on the UI API path — GraphQL and upstream data-requirements analysis are handled out-of-band.

When to Use

• Reviewing a component's data layer for LDS compliance (hand-rolled forms, stringly-typed field names, un-synchronized Apex + LDS, Apex overuse).
• Implementing CRUD on standard or custom objects.
• Deciding between getRecord, getRecords, createRecord, updateRecord, deleteRecord, base record form components, or Apex.
• Fixing stale-data bugs after record mutation.
• Adding schema imports (@salesforce/schema/...) to replace hard-coded field/object names.

Do NOT use this skill for:

• GraphQL query/mutation generation — handled out-of-band today.
• Upstream data-requirements discovery — handled out-of-band today.
• SLDS class / design-token work (use design-systems-slds-apply).
• Accessibility, security, or RTL review — those are separate passes run with their own tooling.

Prerequisites

• Component path.
• Understanding of the component's data operations (read / write / both) and whether Apex is already involved.
• Access to the org's schema for @salesforce/schema imports (Setup → Object Manager → <Object> → Details → API Name; or, when GraphQL serves the read, an SDL pulled from the target org).

Knowledge Bases

• references/lds-expert.md — authoritative LDS knowledge (patterns, adapters, caching, mutation flows).
• references/lds-data-consistency.md — cache invalidation, refreshApex, notifyRecordUpdateAvailable, wire result propagation.
• references/lds-referential-integrity.md — @salesforce/schema imports, field constants, object-name resolution, and their propagation through refactors.

Per-adapter API reference — references/adapter-apis.md holds Syntax / Parameters / Returns / Usage for every UI API adapter, grouped by family (uiRecordApis, uiListsApis, uiRelatedListApis, uiObjectInfoApis). Each adapter is a # `<name>` block; grep for the backticked name (e.g. # `getRecord`) to jump to its entry. Read this before wiring an adapter; do not paraphrase from memory.

Type catalog — references/wire-adapter-types.md holds every type the adapters return (Record, ObjectInfo, FieldValue, etc.), grouped by category and rendered with the same formatter the legacy MCP tool used. Grep for ## <TypeName> to jump to a specific entry.

Read the applicable reference before editing code.

Core Principles

1. Prefer LDS/UIAPI for CRUD on standard and custom objects. Use Apex only when business logic or bulk operations exceed LDS capabilities.
2. Always keep rendered data fresh with refreshApex(wiredResult) or notifyRecordUpdateAvailable([{ recordId }]) after any mutation.
3. Import object and field references from @salesforce/schema — not string literals. This protects the component against metadata renames.
4. Favor base record form components (lightning-record-form, lightning-record-edit-form, lightning-record-view-form) for single-record UIs. They ship with validation, SLDS styling, accessibility, and field-level security.

Review Checklist

Answer Yes / No to each. Any Yes triggers a refactor.

1. Hand-rolling forms instead of base components

• Does the component implement a custom form for single-record CRUD where lightning-record-form, lightning-record-edit-form, or lightning-record-view-form would suffice?
• Does validation logic duplicate what base record form components provide natively?
• Are standard SLDS styles recreated manually instead of leveraging the styling baked into base components?

2. Not importing references

• Are object or field API names referenced as hard-coded strings?
• In templates, are field values accessed directly via expressions like record.data.fields.Name.value without schema imports?
• Does the JS file lack any @salesforce/schema import even though it interacts with Salesforce fields?

3. Mixing Apex and LDS without synchronization

• Does the component read via LDS and mutate the same record through Apex without a subsequent cache refresh?
• Does it fetch through Apex yet rely on the LDS cache for display without synchronizing after updates?
• Do multiple data sources touch the same object without an explicit refresh strategy?

4. Overusing Apex

• Does the component call Apex solely to retrieve or update a single record that getRecord, updateRecord, or a base record form could handle?
• Is Apex used to run a simple SOQL query whose fields are available through standard LDS wire adaptors?
• Are custom Apex methods present for basic CRUD while no LDS/UIAPI calls appear in the code?

Workflow

Step 1 — Inventory the data layer

List every data operation in the component:

• Wire adapters (@wire(getRecord, …), @wire(getRecords, …), @wire(someApexMethod, …)).
• Imperative calls (updateRecord, createRecord, deleteRecord, Apex imperative).
• Reads vs writes, target object(s), fields, and whether the refresh path after writes is wired.

Step 2 — Run the four-section checklist

Walk sections §1–§4 in order. For each section, decide whether it applies to the component under review and record the result in the report. Use the shape below — every section must appear exactly once, either as an issue (violation) under ## LDS Best Practices, or as a compliant entry under ## Sections checked (no issue). Finish with a ## Summary line listing counts and a one-paragraph narrative.

Report shape:

## LDS Best Practices

- §<N> <section title> — <file>:<lines>
  Issue: <what is wrong, specifically citing the pattern in the code>
  Fix: <the corrective change, naming the exact import / API to use>
  Applied: <yes | no>

## Sections checked (no issue)

- §<N> <section title> — <file>:<lines>
  Status: Compliant (no action).
  Evidence: <what in the code makes this section compliant — cite lines, imports, and the base component or schema token being used>

## Summary

- <X> issue(s) found; <Y> fixed; <Z> deferred.
- <one-paragraph narrative of the review — what the component does, why the flagged issues matter, and why the compliant sections are compliant.>

Rules for producing this report:

• Every one of §1–§4 must appear in exactly one of the two blocks. Do not omit a section because it is compliant; record it with evidence under ## Sections checked (no issue).
• Under ## LDS Best Practices, only list actual violations. If there are no violations, write "No best-practice issues found." as the first line, then move every section to the compliant block.
• Cite specific file paths and line ranges from the component under review — never generic references.
• Do not invent additional sections beyond §1–§4; downstream a11y / RTL / security reviews run as separate workflows and have their own reports.

Step 3 — Apply referential-integrity fixes

For every hard-coded API name:

import ACCOUNT_OBJECT from '@salesforce/schema/Account';
import NAME_FIELD from '@salesforce/schema/Account.Name';
import INDUSTRY_FIELD from '@salesforce/schema/Account.Industry';

Use these constants everywhere the object or field is referenced — wire configs, @wire field arrays, getFieldValue(record, NAME_FIELD) calls, and base-component object-api-name / fields attributes.

Full rules: references/lds-referential-integrity.md.

Step 4 — Apply data-consistency fixes

• After imperative LDS mutation (updateRecord, createRecord, deleteRecord), dispatch a refresh:

  import { updateRecord, getRecord } from 'lightning/uiRecordApi';
  import { refreshApex } from '@salesforce/apex';
  
  async handleSave() {
      await updateRecord({ fields: { Id: this.recordId, Name: this.name } });
      await refreshApex(this.wiredRecord);
  }
  

• After Apex mutation of a record the cache holds, prefer:

  import { notifyRecordUpdateAvailable } from 'lightning/uiRecordApi';
  await notifyRecordUpdateAvailable([{ recordId: this.recordId }]);
  

• Keep a reference to wire results (this.wiredRecord = result; return result.data;) so refreshApex can target them.
• Base form components refresh themselves; no manual refresh needed.

Full rules: references/lds-data-consistency.md.

Step 5 — Replace Apex with UIAPI where applicable

• Single-record read → getRecord (with fields + schema imports).
• Single-record update → updateRecord or lightning-record-edit-form.
• Single-record create → createRecord or lightning-record-form with mode="edit".
• Related-record read → getRelatedListRecords.
• Picklist values → getPicklistValues.
• Object metadata → getObjectInfo / getObjectInfos.

When in doubt about adapter shape, grep references/adapter-apis.md for the backticked adapter name (e.g. # `getRecord`) — it has the authoritative parameters, returns, and usage. For @salesforce/schema/<Object>.<Field> paths, confirm the exact API name in Setup → Object Manager → <Object> → Details → API Name. For unfamiliar return types, grep references/wire-adapter-types.md for the type name.

Step 6 — Verify

• No hardcoded API names remain in the component files.
• Every write path has a matching refresh path (or uses a base form component).
• No duplicate reads of the same record via both Apex and UIAPI.
• Existing Jest tests pass; add coverage for the refresh flow (refreshApex called exactly once per mutation).

Cross-References

• Related skills:
  • experience-lwc-generate — when the review surfaces the need to regenerate rather than patch the component.
  • design-systems-slds-apply — for SLDS class / design-token cleanup surfaced by the LDS review.
• Adjacent (out-of-band today):
  • GraphQL query/mutation authoring, upstream data-requirements analysis, and the security / RTL / a11y review passes run as separate workflows with their own tooling.

Examples

Base-component first (preferred)

<template>
    <lightning-record-form
        record-id={recordId}
        object-api-name="Account"
        fields={fields}
        mode="edit"
        onsuccess={handleSuccess}>
    </lightning-record-form>
</template>

import { LightningElement, api } from 'lwc';
import NAME_FIELD from '@salesforce/schema/Account.Name';
import INDUSTRY_FIELD from '@salesforce/schema/Account.Industry';

export default class AccountEditor extends LightningElement {
    @api recordId;
    fields = [NAME_FIELD, INDUSTRY_FIELD];

    handleSuccess() {
        this.dispatchEvent(new CustomEvent('saved'));
    }
}

Imperative update with refresh

import { LightningElement, api, wire } from 'lwc';
import { getRecord, updateRecord } from 'lightning/uiRecordApi';
import { refreshApex } from '@salesforce/apex';
import ACCOUNT_NAME from '@salesforce/schema/Account.Name';

export default class RenameAccount extends LightningElement {
    @api recordId;
    wiredRecord;

    @wire(getRecord, { recordId: '$recordId', fields: [ACCOUNT_NAME] })
    wired(result) {
        this.wiredRecord = result;
    }

    async handleRename(event) {
        await updateRecord({ fields: { Id: this.recordId, Name: event.detail } });
        await refreshApex(this.wiredRecord);
    }
}

Verification

• Grep for @salesforce/schema/ imports — they should cover every field/object the component references.
• Grep for string literals that look like API names ('Account', 'Name') — none should appear in wire configs or field arrays.
• Trace every mutation call to a refresh call (either refreshApex, notifyRecordUpdateAvailable, or a base form handling it internally).
• Confirm Apex is only used where UIAPI can't satisfy the requirement (bulk, complex joins, custom logic).