fix(ui): block clipboard paste causes duplicate ID errors in Postgres

[PatrikKozak]

Overview

Fixes duplicate block ID errors when pasting blocks across documents in Postgres-based database adapters.

The Problem

When copying and pasting blocks between documents, the pasted block retained the original block's ID. This caused validation errors in Postgres/SQLite but worked fine in MongoDB.

Why the difference?

• MongoDB: Stores blocks as nested documents. Block IDs only need to be unique within a single document.
• Postgres/SQLite: Stores blocks in separate tables with _uuid as the primary key. Block IDs must be globally unique across all documents.

Error when pasting:
The following field is invalid: id

Key Changes

• ID regeneration on paste: When pasting clipboard data, all fields ending with .id now generate fresh ObjectIDs instead of copying the original ID.

• Row metadata sync: After regenerating IDs, the parent field's rows array metadata is updated to reference the new IDs. Handles both nested blocks (e.g., layout.0.subBlocks.1.id) and top-level blocks (e.g., duplicate.0.id).

• ID replacement tracking: Uses a Map to track clipboard path → new ID mappings, then applies these to parent row metadata in a second pass.

Testing

• Unit tests: Added 4 tests in mergeFormStateFromClipboard.spec.ts covering basic paste, nested blocks, field preservation, and row-to-field paste scenarios.

• E2E test: Added test verifying blocks can be copied from one document and pasted into another without duplicate ID errors.

Technical Details

The fix operates on flat form state paths (e.g., layout.0.subBlocks.1.someField.id), making it field-type agnostic. Any path ending with .id gets a new ObjectID, regardless of nesting depth or surrounding field types (groups, tabs, arrays, etc.).

Only blocks and arrays use ID fields and row metadata, so other field types remain unaffected.

Fixes #15227

[github-actions]

📦 esbuild Bundle Analysis for payload

This analysis was generated by esbuild-bundle-analyzer. 🤖

Meta File	Out File	Size (raw)	Note
packages/next/meta_index.json	esbuild/index.js	959.88 KB	✅ No change
packages/payload/meta_index.json	esbuild/index.js	1.32 MB	✅ No change
packages/payload/meta_shared.json	esbuild/exports/shared.js	190.59 KB	✅ No change
packages/richtext-lexical/meta_client.json	esbuild/exports/client_optimized/index.js	280.36 KB	✅ No change
packages/ui/meta_client.json	esbuild/exports/client_optimized/index.js	1.18 MB	⚠️ +774 B (+0.1%)
packages/ui/meta_shared.json	esbuild/exports/shared_optimized/index.js	16.32 KB	✅ No change

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These visualization shows top 20 largest paths in the bundle.

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Details

Next to the size is how much the size has increased or decreased compared with the base branch of this PR.

• ‼️: Size increased by 20% or more. Special attention should be given to this.
• ⚠️: Size increased in acceptable range (lower than 20%).
• ✅: No change or even downsized.
• 🗑️: The out file is deleted: not found in base branch.
• 🆕: The out file is newly found: will be added to base branch.

[github-actions]

🚀 This is included in version v3.79.1