fix(drizzle): error when using contains operator on hasMany select fields

[AlessioGr]

Fixes contains operator on hasMany select fields in PostgreSQL. This was a regression introduced in #15671.

The problem

Given a collection with a hasMany select field:

{
  slug: 'users',
  fields: [
    {
      name: 'roles',
      type: 'select',
      hasMany: true,
      options: ['user', 'admin', 'editor'],
    },
  ],
}

Payload stores this across two PostgreSQL tables. For a user created with roles: ['admin', 'editor']:

users

id	created_at	updated_at
1	2026-03-05	2026-03-05

users_roles

id	parent_id	value	order
1	1	admin	1
2	1	editor	2

The value column is a PostgreSQL enum type, not a varchar.

When querying { roles: { contains: 'admin' } }, Payload generated:

SELECT DISTINCT "users"."id"
FROM "users"
LEFT JOIN "users_roles"
  ON "users"."id" = "users_roles"."parent_id"
WHERE "users_roles"."value" ILIKE '%admin%'
-- ❌ PostgreSQL error: operator does not exist: enum_users_roles ~~* unknown

ILIKE does not work on PostgreSQL enum types.

The fix

The LEFT JOIN already flattens the array into individual rows:

users.id	users_roles.value
1	admin
1	editor

So "contains admin" just means "has a row where value equals admin". The fix converts contains to equals for hasMany select fields, the same way it already works for hasMany relationship and upload fields:

SELECT DISTINCT "users"."id"
FROM "users"
LEFT JOIN "users_roles"
  ON "users"."id" = "users_roles"."parent_id"
WHERE "users_roles"."value" = 'admin'
-- ✅ Matches row 1, returns user id=1

Why hasMany text fields are different

HasMany text fields store values as varchar, not as an enum. ILIKE works fine on varchar columns, so substring matching (contains: 'adm' matching 'admin') is valid there. Whether it's desirable is a problem separate from this PR, being discussed internally here

[github-actions]

📦 esbuild Bundle Analysis for payload

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

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packages/payload/meta_index.json	esbuild/index.js	1.32 MB	🆕 Added
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packages/richtext-lexical/meta_client.json	esbuild/exports/client_optimized/index.js	282.03 KB	🆕 Added
packages/ui/meta_client.json	esbuild/exports/client_optimized/index.js	1.18 MB	🆕 Added
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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