PHP error: Call to a member function format() on string - php

Question

i have a problem, i don't know where is the problem come from. When i save my data to server, i've got error Call to a member function format() on string.
This is my Controller code:
public function newAction(Request $request)
{
$this->denyAccessUnlessGranted('ROLE_HRM_SALARY_ADJUSTMENT_CREATE');
$corp = $this->getSelectedCorporationEntity();
$entity = new SalaryAdjustment();
$entity->setCorporation($corp);
if ($request->isMethod('POST')) {
$data = json_decode($request->getContent());
dump($data);
//$this->validationBeforeProgress('new', $data, $data->level, '', $data->docType);
$employeeEntity = $this->getDoctrine()->getRepository(Employee::class)->find($data->employee);
$entity->setEmployee($employeeEntity);
$entity->setNumber($data->number);
$entity->setEffectiveDate($data->effectiveDate);
$entity->setReference($data->reference);
$entity->setReferenceNumber($data->referenceNumber);
$entity->setRemarks($data->remarks);
$entity->setApprove(false);
$entity->setVoid(false);
$entity->setCreatedBy($this->getCurrentUser()->getUsername());
$entity->setCreatedDate(new \DateTime());
$em = $this->getEM();
$this->validateEntity($entity);
$em->persist($entity);
$newEntityDetail = $data->detail;
if (count($newEntityDetail) > 0) {
foreach ($newEntityDetail as $item) {
dump($item);
if ($item->newValue > 0 || $item->oldValue > 0){
$entityDetail = new SalaryAdjustmentDetail();
$lookupSalaryEntity = $this->getDoctrine()->getRepository(LookupSalary::class)->find($item->lookupSalaryId);
$entityDetail->setLookupSalary($lookupSalaryEntity);
if ($item->oldEffectiveDate != null) {
$entityDetail->setOldEffectiveDate($item->oldEffectiveDate);
}
$entityDetail->setOldValue($item->oldValue);
$entityDetail->setNewValue($item->newValue);
$entityDetail->setSalaryAdjustment($entity);
$this->validateEntity($entityDetail);
$em->persist($entityDetail);
}
}
} else {
throw new \Exception('Detail must be have minimal 1 row');
}
$em->flush();
}
return new JsonResponse(['data' => 'Done']);
}
the error come from when the code $em->flush(). I feel the problem come from when the code $entityDetail->setOldValue($item->oldValue); and entityDetail->setNewValue($item->newValue); because i'm using decimal type in entity for the first time.
i use 2 entity for save my data, the entity is SalaryAdjustment and SalaryAdjustmentDetail. There is the code:
class SalaryAdjustment
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="SalaryAdjustmentDetail", mappedBy="salaryAdjustment", cascade={"persist", "remove"})
*/
private $salaryAdjustmentDetail;
public function __construct() {
$this->salaryAdjustmentDetail = new ArrayCollection();
}
/**
* #ORM\ManyToOne(targetEntity="Dsp\DspAppsBundle\Entity\HRM\Employee\Employee")
* #ORM\JoinColumn(name="employee_id", referencedColumnName="id", nullable=false)
*/
private $employee;
/**
* #ORM\ManyToOne(targetEntity="Dsp\DspAdministrationBundle\Entity\Corporation")
* #ORM\JoinColumn(name="corporation_id", referencedColumnName="id", nullable=false)
*/
private $corporation;
/**
* #var string
*
* #ORM\Column(name="number", type="string", length=20)
*/
private $number;
/**
* #var \DateTime
*
* #ORM\Column(name="effective_date", type="date")
*/
private $effectiveDate;
/**
* #var string
*
* #ORM\Column(name="reference", type="string", length=50, nullable=true)
*/
private $reference;
/**
* #var string
*
* #ORM\Column(name="reference_number", type="string", length=100, nullable=true)
*/
private $referenceNumber;
/**
* #var string
*
* #ORM\Column(name="remarks", type="string", length=300, nullable=true)
*/
private $remarks;
/**
* #var bool
*
* #ORM\Column(name="approve", type="boolean")
*/
private $approve;
/**
* #var bool
*
* #ORM\Column(name="void", type="boolean")
*/
private $void;
/**
* #var string
*
* #ORM\Column(name="created_by", type="string", length=50)
*/
private $createdBy;
/**
* #var \DateTime
*
* #ORM\Column(name="created_date", type="datetime")
*/
private $createdDate;
/**
* #var string
*
* #ORM\Column(name="modified_by", type="string", length=50, nullable=true)
*/
private $modifiedBy;
/**
* #var \DateTime
*
* #ORM\Column(name="modified_date", type="datetime", nullable=true)
*/
private $modifiedDate;
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Add salaryAdjustmentDetail
*
* #param \Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustmentDetail $salaryAdjustmentDetail
*
* #return SalaryAdjustment
*/
public function addSalaryAdjustmentDetail(SalaryAdjustmentDetail $salaryAdjustmentDetail)
{
$this->salaryAdjustmentDetail[] = $salaryAdjustmentDetail;
return $this;
}
/**
* Remove salaryAdjustmentDetail
*
* #param \Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustmentDetail $salaryAdjustmentDetail
*/
public function removeSalaryAdjustmentDetail(\Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustmentDetail $salaryAdjustmentDetail)
{
$this->salaryAdjustmentDetail->removeElement($salaryAdjustmentDetail);
}
/**
* Set employee
*
* #param \Dsp\DspAppsBundle\Entity\HRM\Employee\Employee $employee
*
* #return SalaryAdjustment
*/
public function setEmployee(\Dsp\DspAppsBundle\Entity\HRM\Employee\Employee $employee)
{
$this->employee = $employee;
return $this;
}
/**
* Get employee
*
* #return \Dsp\DspAppsBundle\Entity\HRM\Employee\Employee
*/
public function getEmployee()
{
return $this->employee;
}
/**
* Set corporation
*
* #param \Dsp\DspAdministrationBundle\Entity\Corporation $corporation
*
* #return SalaryAdjustment
*/
public function setCorporation(\Dsp\DspAdministrationBundle\Entity\Corporation $corporation)
{
$this->corporation = $corporation;
return $this;
}
/**
* Get corporation
*
* #return \Dsp\DspAdministrationBundle\Entity\Corporation
*/
public function getCorporation()
{
return $this->corporation;
}
/**
* Set number
*
* #param string $number
*
* #return SalaryAdjustment
*/
public function setNumber($number)
{
$this->number = $number;
return $this;
}
/**
* Get number
*
* #return string
*/
public function getNumber()
{
return $this->number;
}
/**
* Set effectiveDate
*
* #param \DateTime $effectiveDate
*
* #return SalaryAdjustment
*/
public function setEffectiveDate($effectiveDate)
{
$this->effectiveDate = $effectiveDate;
return $this;
}
/**
* Get effectiveDate
*
* #return \DateTime
*/
public function getEffectiveDate()
{
return $this->effectiveDate;
}
/**
* Set reference
*
* #param string $reference
*
* #return SalaryAdjustment
*/
public function setReference($reference)
{
$this->reference = $reference;
return $this;
}
/**
* Get reference
*
* #return string
*/
public function getReference()
{
return $this->reference;
}
/**
* Set referenceNumber
*
* #param string $referenceNumber
*
* #return SalaryAdjustment
*/
public function setReferenceNumber($referenceNumber)
{
$this->referenceNumber = $referenceNumber;
return $this;
}
/**
* Get referenceNumber
*
* #return string
*/
public function getReferenceNumber()
{
return $this->referenceNumber;
}
/**
* Set remarks
*
* #param string $remarks
*
* #return SalaryAdjustment
*/
public function setRemarks($remarks)
{
$this->remarks = $remarks;
return $this;
}
/**
* Get remarks
*
* #return string
*/
public function getRemarks()
{
return $this->remarks;
}
/**
* Set approve
*
* #param boolean $approve
*
* #return SalaryAdjustment
*/
public function setApprove($approve)
{
$this->approve = $approve;
return $this;
}
/**
* Get approve
*
* #return bool
*/
public function getApprove()
{
return $this->approve;
}
/**
* Set void
*
* #param boolean $void
*
* #return SalaryAdjustment
*/
public function setVoid($void)
{
$this->void = $void;
return $this;
}
/**
* Get void
*
* #return bool
*/
public function getVoid()
{
return $this->void;
}
/**
* Set createdBy
*
* #param string $createdBy
*
* #return SalaryAdjustment
*/
public function setCreatedBy($createdBy)
{
$this->createdBy = $createdBy;
return $this;
}
/**
* Get createdBy
*
* #return string
*/
public function getCreatedBy()
{
return $this->createdBy;
}
/**
* Set createdDate
*
* #param \DateTime $createdDate
*
* #return SalaryAdjustment
*/
public function setCreatedDate($createdDate)
{
$this->createdDate = $createdDate;
return $this;
}
/**
* Get createdDate
*
* #return \DateTime
*/
public function getCreatedDate()
{
return $this->createdDate;
}
/**
* Set modifiedBy
*
* #param string $modifiedBy
*
* #return SalaryAdjustment
*/
public function setModifiedBy($modifiedBy)
{
$this->modifiedBy = $modifiedBy;
return $this;
}
/**
* Get modifiedBy
*
* #return string
*/
public function getModifiedBy()
{
return $this->modifiedBy;
}
/**
* Set modifiedDate
*
* #param \DateTime $modifiedDate
*
* #return SalaryAdjustment
*/
public function setModifiedDate($modifiedDate)
{
$this->modifiedDate = $modifiedDate;
return $this;
}
/**
* Get modifiedDate
*
* #return \DateTime
*/
public function getModifiedDate()
{
return $this->modifiedDate;
}
}
And this is my SalaryAdjustmentDetail:
class SalaryAdjustmentDetail
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="Dsp\DspAppsBundle\Entity\HRM\Lookup\LookupSalary")
* #ORM\JoinColumn(name="lookup_salary_id", referencedColumnName="id", nullable=false)
*/
private $lookupSalary;
/**
* #ORM\ManyToOne(targetEntity="Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustment", inversedBy="SalaryAdjustmentDetail")
* #ORM\JoinColumn(name="salary_adjustment_id", referencedColumnName="id", onDelete="CASCADE", nullable=false)
*/
private $salaryAdjustment;
/**
* #var \DateTime
*
* #ORM\Column(name="old_effective_date", type="date", nullable=true)
*/
private $oldEffectiveDate;
/**
* #var string
*
* #ORM\Column(name="old_value", type="decimal", precision=20, scale=4)
*/
private $oldValue;
/**
* #var string
*
* #ORM\Column(name="new_value", type="decimal", precision=20, scale=4)
*/
private $newValue;
/**
* Get id
*
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* Set lookupSalary
*
* #param \Dsp\DspAppsBundle\Entity\HRM\Lookup\LookupSalary $lookupSalary
*
* #return SalaryAdjustmentDetail
*/
public function setLookupSalary(\Dsp\DspAppsBundle\Entity\HRM\Lookup\LookupSalary $lookupSalary)
{
$this->lookupSalary = $lookupSalary;
return $this;
}
/**
* Get lookupSalary
*
* #return \Dsp\DspAppsBundle\Entity\HRM\Lookup\LookupSalary
*/
public function getLookupSalary()
{
return $this->lookupSalary;
}
/**
* Set salaryAdjustment
*
* #param \Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustment $salaryAdjustment
*
* #return SalaryAdjustmentDetail
*/
public function setSalaryAdjustment(\Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustment $salaryAdjustment)
{
$this->salaryAdjustment = $salaryAdjustment;
return $this;
}
/**
* Get salaryAdjustment
*
* #return \Dsp\DspAppsBundle\Entity\HRM\SalaryAdjustment\SalaryAdjustment
*/
public function getSalaryAdjustment()
{
return $this->salaryAdjustment;
}
/**
* Set oldEffectiveDate
*
* #param \DateTime $oldEffectiveDate
*
* #return SalaryAdjustmentDetail
*/
public function setOldEffectiveDate($oldEffectiveDate)
{
$this->oldEffectiveDate = $oldEffectiveDate;
return $this;
}
/**
* Get oldEffectiveDate
*
* #return \DateTime
*/
public function getOldEffectiveDate()
{
return $this->oldEffectiveDate;
}
/**
* Set oldValue
*
* #param string $oldValue
*
* #return SalaryAdjustmentDetail
*/
public function setOldValue($oldValue)
{
$this->oldValue = $oldValue;
return $this;
}
/**
* Get oldValue
*
* #return string
*/
public function getOldValue()
{
return $this->oldValue;
}
/**
* Set newValue
*
* #param string $newValue
*
* #return SalaryAdjustmentDetail
*/
public function setNewValue($newValue)
{
$this->newValue = $newValue;
return $this;
}
/**
* Get newValue
*
* #return string
*/
public function getNewValue()
{
return $this->newValue;
}
}
Please help me for resolve my problem :')