fix: number field validation (#4233)

packages/payload/src/fields/validations.spec.ts

@@ -413,6 +413,11 @@ describe('Field Validations', () => {
       const result = number(val, numberOptions)
       expect(result).toBe(true)
     })
+    it('should validate 0', () => {
+      const val = 0
+      const result = number(val, { ...numberOptions, required: true })
+      expect(result).toBe(true)
+    })
     it('should validate 2', () => {
       const val = 1.5
       const result = number(val, numberOptions)

packages/payload/src/fields/validations.ts

@@ -205,8 +205,11 @@ export const number: Validate<unknown, unknown, NumberField> = (
     if (typeof lengthValidationResult === 'string') return lengthValidationResult
   }
 
-  if (!value && required) return t('validation:required')
-  if (!value && !required) return true
+  if (!value && !isNumber(value)) {
+    // if no value is present, validate based on required
+    if (required) return t('validation:required')
+    if (!required) return true
+  }
 
   const numbersToValidate: number[] = Array.isArray(value) ? value : [value]