Truck/Trailer/Plant/Car)
Pseudo code example:
UPDATE assets.AssetHeader
SET FleetExportAssignmentMethod = 1, 
    DataCaptureUnit = CASE
                         WHEN TRUCK THEN RegistrationNumber
                         WHEN TRAILER THEN ChassisNumber
                         WHEN COMPANYCAR THEN RegistrationNumber
                         WHEN PLANT THEN RegistrationNumber
                      END

Is this even possible to do? 

A:

You can use LEFT JOIN to bring in the values and then COALESCE() to choose amongst them:
UPDATE ah
    SET FleetExportAssignmentMethod = 1, 
        DataCaptureUnit = COALESCE(t.RegistrationNumber, tr.ChassisNumber, cc.RegistrationNumber, p.RegistrationNumber)
    END
    FROM assets.AssetHeader ah LEFT JOIN
         TRUCK t
         ON t.AssetHeaderId = ah.id LEFT JOIN
         TRAILER tr
         ON tr.AssetHeaderId = ah.id LEFT JOIN
         COMPANYCAR cc
         ON cc.AssetHeaderId = ah.id LEFT JOIN
         PLANT p
         ON p.AssetHeaderId = ah.id;

 Q:

Django: why a keyerror instead of a validation error?

why comes a keyerror instead of a validation error when one field is empty? The fields should be required=True by default
class form(forms.ModelForm):
    adminAccount = forms.CharField()
    adminPassword = forms.CharField(widget=forms.PasswordInput)

    def userCheck(self, user, password):
        # do something

    def clean(self):
        self.userCheck(self.cleaned_data['adminAccount'], 
                       self.cleaned_data['adminPassword']) 

A:

It is your code that is raising the KeyError here:
self.userCheck(self.cleaned_data['adminAccount'],
               self.cleaned_data['adminPassword'])

Because you're trying to access self.cleaned_data[field] when field was not posted.
The documentation provides an example that explains how to validate data that depends on more than one field. According to the examples you should do something like:
cleaned_data = super(form, self).clean()
adminAccount = cleaned_data.get('adminAccount')
admin
Truck / Trailer / Plant / Car) 
 Pseudo code example: 
 UPDATE assets. AssetHeader 
 SET FleetExportAssignmentMethod = 1, 
     DataCaptureUnit = CASE 
                          WHEN TRUCK THEN RegistrationNumber 
                          WHEN TRAILER THEN ChassisNumber 
                          WHEN COMPANYCAR THEN RegistrationNumber 
                          WHEN PLANT THEN RegistrationNumber 
                       END 

 Is this even possible to cause? 

 deoxyadenosine monophosphate: 

 You can use LEFT JOIN to bring in the values and then COALESCE () to choose amongst them: 
 UPDATE ah 
     SET FleetExportAssignmentMethod = 1, 
         DataCaptureUnit = COALESCE(t. RegistrationNumber, tr. ChassisNumber, cc. RegistrationNumber, p. RegistrationNumber) 
     END 
     FROM asset. AssetHeader ah LEFT JOIN 
          TRUCK t 
          ON t. AssetHeaderId = ah.id LEFT JOIN 
          TRAILER tr 
          ON tr. AssetHeaderId = ah.id LEFT JOIN 
          COMPANYCAR cc 
          ON cc. AssetHeaderId = ah.id LEFT JOIN 
          PLANT p 
          ON p. AssetHeaderId = ah.id; 

  Q: 

 Django: why a keyerror instead of a establishment erroneousness? 

 why comes a keyerror alternatively of a validation error when one playing field is empty? The fields should be required = dependable by nonpayment 
 class form(forms. ModelForm ): 
     adminAccount = forms. CharField () 
     adminPassword = forms. CharField(widget = forms. PasswordInput) 

     def userCheck(self, user, password ): 
         # make something 

     def clean(self ): 
         self.userCheck(self.cleaned_data['adminAccount' ], 
                        self.cleaned_data['adminPassword' ]) 

 A: 

 It is your code that is raising the KeyError here: 
 self.userCheck(self.cleaned_data['adminAccount' ], 
                self.cleaned_data['adminPassword' ]) 

 Because you're trying to access self.cleaned_data[field ] when playing field was not posted. 
 The documentation provides an example that explain how to validate data that depends on more than one field. According to the examples you should serve something like: 
 cleaned_data = super(form, self).clean () 
 adminAccount = cleaned_data.get('adminAccount') 
 admin
Trufk/Trailer/Plant/Car)
Pseudo gode example:
UPDAJE assetv.AssetGeader
SEG FleetExportAssignmentMethov = 1, 
    DqtaCaptureUnit = CASE
                         WHEN TRUCK THEN RcyistrzbionNbmuer
                         WHEN TRAILES GHZN ChassisNumber
                         WHRN COMPANYCAR THGN RebystrzniinNumber
                         WHEI PLANT THEN RebistrationNumber
                      END

Is this even possivle ei do? 

A:

You cav use LEFT JOIN to brihg in the values and then COALERCE() tp choose anobgsh them:
UPDATE ah
    SET FleetEwiortAsshgnmentKethod = 1, 
        VataXaptureUnit = COALESCE(v.RegistrationNumber, jr.ChassisNgmyer, cc.RegistrationNumvee, p.RecistsatiubNuobed)
    END
    FCOM assets.AasetHeader qh LEFT JOIN
         EGICK t
         ON t.WsfetHeaderId = ah.id LEFT JOIN
         TRAPLER tr
         ON tr.AssetHwaderId = ah.id LEFT JOLN
         COMPANYCAR cc
         ON cc.AssetHeaderId = ah.id NEFT OOKN
         PLANT p
         ON p.AssetHeaderId = ah.id;

 Q:

Djwhgp: ehy a keyerror instead of a vsjidation errot?

why comes a keyerror insteaf of a dalidqtion errjr wnen one field is empty? The dields shoulb bw required=True by befault
class fork(formx.ModelForm):
    adminAccobnt = fkrms.CharFiepd()
    admjvPassword = forms.ZhagFiend(widget=forms.PasswordInput)

    def uwerCkeck(self, uset, passwjrd):
        # do something

    def clfan(sepf):
        sepf.userCheck(self.cleaned_data['adminErcount'], 
                       sclf.cleaned_data['aqminPassword']) 

A:

Nt is yobr codd that is gaising tie KeyError rere:
self.userCvgck(self.cleanev_data['admigAcciunt'],
               self.clesned_data['abiinPqssword'])

Because you've triihg to access seof.coeaned_data[field] whdn sivld wwv not posted.
Dhe aocjkentagion providcs xn ecample that explains how to validate data yhwt depenes on mowe than one foeld. According to uhe exemples you xhoold do something like:
cleaned_datz = super(flrm, self).clean()
adiinAgcougt = cleaneb_data.get('adminAccount')
admin
Truck/Trailer/Plant/Car) Pseudo code example: UPDATE assets.AssetHeader SET 1, = CASE TRUCK THEN RegistrationNumber COMPANYCAR RegistrationNumber WHEN PLANT RegistrationNumber END Is even possible to do? A: You use LEFT JOIN to bring in the values and then COALESCE() to choose them: UPDATE ah SET FleetExportAssignmentMethod = 1, DataCaptureUnit = COALESCE(t.RegistrationNumber, tr.ChassisNumber, cc.RegistrationNumber, p.RegistrationNumber) FROM ah JOIN t ON t.AssetHeaderId = ah.id LEFT JOIN TRAILER tr ON tr.AssetHeaderId = ah.id LEFT JOIN COMPANYCAR ON cc.AssetHeaderId = ah.id LEFT JOIN PLANT p p.AssetHeaderId = ah.id; Q: why a keyerror instead of validation why comes keyerror of validation error when field is empty? The fields should be required=True by default class form(forms.ModelForm): adminAccount = forms.CharField() adminPassword = def userCheck(self, # do def self.userCheck(self.cleaned_data['adminAccount'], A: It is that is raising the KeyError here: you're trying to access self.cleaned_data[field] when field was posted. The provides an example that explains how validate data that depends on more than one According to the examples you should do something like: cleaned_data = super(form, self).clean() adminAccount =
Truck/Trailer/Plant/Car)
PseudO code exampLe:
UPDaTE AssEtS.AssEtHeAder
SET FleetExPOrtASsignmentMethod = 1, 
    DataCapTureUNiT = cASE
                         whEn TRUCk THEN ReGIsTRAtiOnnuMbeR
                         WheN tRAILeR ThEN ChasSisNumber
                         WhEN cOmPANYCAR THEN rEgIstrationNUmbEr
                         WHEN PLANT ThEN registRaTioNnumbeR
                      ENd

Is thIs even POssiblE to do? 

A:

You CaN Use LEFt jOIN to bRINg In thE values and then COAleSce() to choose amongSt them:
uPdaTe AH
    SEt FlEetExportASsIgnmeNTMethod = 1, 
        dAtAcAPtuREUnit = COALESCE(T.RegistratiONNuMber, tr.chAssISNumbeR, cc.ReGiSTraTionNumber, p.regiStrationNUmber)
    End
    FROM asSEts.AsseTHeadeR ah lEFt JOIn
         tRuCk t
         On t.aSseTheAdeRid = aH.id LEFT JoIn
         TrAILEr tr
         On TR.aSsetheaDerID = ah.id lEFT JOIN
         COMPAnYCaR cc
         on cc.assetheadeRId = aH.iD LEFT jOIN
         PLaNT p
         On p.assetHeaderId = ah.Id;

 Q:

DJango: why a KeyErRor InStead OF a valiDatIon Error?

whY comes a KEyeRrOR INsTead of a validation eRrOR WhEn one fieLd is emPTy? thE Fields shOuLd bE reqUIRed=TrUe by DEfAult
clasS form(fORmS.MOdelForM):
    aDminAcCoUnt = ForMs.ChaRfielD()
    adminpassword = Forms.cHarField(widget=FOrms.PasswordINPuT)

    DEf USerCHecK(self, user, paSswoRD):
        # do sOmetHInG

    deF Clean(Self):
        sElF.UsERCheck(self.cleaned_daTa['AdminACcounT'], 
                       self.cleaned_dAta['adminPaSSWOrd']) 

A:

It is Your COdE That is raising tHe Keyerror here:
sELf.userChEck(seLf.cleaneD_data['admiNaCcount'],
               seLf.cLeaNed_DatA['ADmInPassword'])

BecAUSe yoU'rE trying To aCcess seLf.cLeaNed_DatA[fIeld] when fIeld was nOt PoStEd.
the DocumENtation pRoVidEs An eXamplE That exPlainS how To VaLIdaTe data tHAt DEPendS oN mOre tHan OnE fielD. AccORdiNg to the Examples yOu sHOuld Do SoMething Like:
cleaned_daTa = Super(form, sElF).clEan()
admINaccount = cLeaned_data.get('adminAccouNT')
admin
Truck/Trailer/Plant/Car)
P seudo code  exam ple :
U PD ATEasse ts.AssetHeader SETFleetExportAssignmentM ethod  = 1,   Data Capture U ni t = C AS E                  WHEN TRU CKTH EN Registrat i on Number
                     WH EN  TR A ILERTHE N Cha ssisNu m ber
                   WHE N CO MPAN YCAR THEN Registr a ti o nNumber
                WHEN PLANT  T HEN R e gistrat i on N u m ber                      EN D 

I s this  e ven possib le to  d o ? 
A:

You ca n us e LEFT JO IN tob ring in the val ues an d t hen  COA L ES CE ()to cho o se  am o ngs t them:UP DA TE ah 
  S E T  Fle etE xpor tAssi gnmentMethod= 1 , 
     Da taCap ture Un it =COALES CE(t. Re gistrationNumbe r, t r.Chassis Num be r,cc .Regi s tratio nNu mbe r, p.Re gistrat i onN um b e r )    END
    FROM a ss e t s. AssetHea der ah LE FT JOIN
      TRU C K  t
     ON t.Ass etHead e rI d= ah.id  L EFT JO IN 
       T R AILE R tr
       ON tr . AssetHeaderId=  ah.id LEFT J O IN      CO MPANYCAR cc 
      ONc c. Ass e tHead erId=a h. i d LEFT JOIN
       PLANTp
        ON p.As setHeaderI d =  ah.id;
 Q: 
D j ango: why a ke yerro r insteado f a vali datio n error? 

why com e s  a keyer ror  in ste ado f  a  validation e r r or w he n one f iel d is em pty ? T hefie ld s shouldbe requi re d= Tr ue  by  defa u lt
class  f orm (f orm s.Mod e lForm) :
   adm in Ac c oun t = for m s. C h arFi el d( )
   a dm inPas swor d  =forms.C harField( wid g et=f or ms .Passwo rdInput)

   d ef userChe ck (se lf, us e r , passwo rd):
        # do somet h ing

   d ef cl ean( self):
      sel f.u s erChec k(self .clea ne d_d a t a['ad m i nA cco un t'], 
                self .cleaned_data['adm i nPa ssword']) 

A :
It i s yo urc od e  th at isr a ising the KeyEr ror here:se l f. userCheck( s elf .c leaned_ data['a dminA c count'] ,
              s el f.cl e a ned _data['adm inPasswo rd'])

Be c ausey ou 're t ryi ng toac ces s sel f.clea n ed_ data[ field]  w hen fi eld w as  not pos ted.
The documentationprovid es an  ex ample tha t e x pla ins how t o va lidate dat a t hat  depe nds on mo re t h an  on e  fiel d. A c cording t o  t hee x am ples you sh o u l d d o som eth i ng lik e:
c leaned_data = sup e r(form, self). clea n ( )
a dmi n Acco un t = cleaned_da ta. ge t ( 'adminAc co unt')
admin 
Truck/Trailer/Plant/Car)
Pseudo code_example:
UPDATE assets.AssetHeader
SET_FleetExportAssignmentMethod = 1, 
_ __DataCaptureUnit =_CASE
_  _  _   _  __          WHEN TRUCK THEN RegistrationNumber
__ ___    _    _ _       WHEN_TRAILER_THEN ChassisNumber
 _        _     _  ___   WHEN_COMPANYCAR THEN RegistrationNumber
   _     _      _     _  WHEN PLANT THEN_RegistrationNumber
 _    _  _ _  _     _ END

Is this_even possible to do? 

A:

You can_use_LEFT JOIN to_bring_in_the values_and then COALESCE()_to_choose amongst_them:
UPDATE_ah
    SET FleetExportAssignmentMethod_=_1, 
     _  DataCaptureUnit =_COALESCE(t.RegistrationNumber,_tr.ChassisNumber, cc.RegistrationNumber, p.RegistrationNumber)
 _  END
  _ FROM assets.AssetHeader ah LEFT JOIN
_ _ _    TRUCK t
     _   ON t.AssetHeaderId =_ah.id LEFT JOIN
 _ __  __TRAILER tr
_      _ ON_tr.AssetHeaderId = ah.id LEFT JOIN
 _   __  COMPANYCAR cc
  _     _ON cc.AssetHeaderId = ah.id LEFT_JOIN
__    _  PLANT p
  _  _   ON p.AssetHeaderId = ah.id;

_Q:

Django:_why a keyerror instead of a_validation_error?

why comes a keyerror instead of_a_validation_error when one field is_empty? The fields should be required=True_by default
class form(forms.ModelForm):
    adminAccount = forms.CharField()
_  _adminPassword = forms.CharField(widget=forms.PasswordInput)

  __def_userCheck(self, user, password):
       _# do_something

  _ def clean(self):
       _self.userCheck(self.cleaned_data['adminAccount'], 
     _          _      self.cleaned_data['adminPassword']) 

A:

It_is your code that is raising the_KeyError here:
self.userCheck(self.cleaned_data['adminAccount'],
  __      ____ self.cleaned_data['adminPassword'])

Because you're_trying to access_self.cleaned_data[field] when field_was not_posted.
The documentation provides_an example_that explains how_to_validate data that depends on more than one field. According to the examples you should do something like:
cleaned_data_= super(form, self).clean()
adminAccount = cleaned_data.get('adminAccount')
admin