
]

fieldName = 'TUITION'
valueSource = '${' + "${fieldMapping[fieldName]}" + '}'
println valueSource

value = Eval.me('valueSource')

The Eval fails. Here's the output:
123
${target.amount}
Caught: groovy.lang.MissingPropertyException: No such property: valueSource for class: Script1
groovy.lang.MissingPropertyException: No such property: valueSource for class: Script1
    at Script1.run(Script1.groovy:1)
    at t.run(t.groovy:17)

What's necessary to evaluate the generated variable name and return the value 123? It seems like the real problem is that it's not recognizing that valueSource has been defined, not the actual expression held in valueSource, but that could be wring, too.

A:

You're almost there, but you need to use a slightly different mechanism: the GroovyShell. You can instantiate a GroovyShell and use it to evaluate a String as a script, returning the result. Here's your example, modified to work properly:
class MyClass {
    Integer amount = 123
}

target = new MyClass()

fieldMapping = [
        'TUITION' : 'target.amount'
]
fieldName = 'TUITION'

// These are the values made available to the script through the Binding
args = [target: target]

// Create the shell with the binding as a parameter
shell = new GroovyShell(args as Binding)

// Evaluate the "script", which in this case is just the string "target.amount".
// Inside the shell, "target" is available because you added it to the shell's binding.
result = shell.evaluate(fieldMapping[fieldName])

assert result == 123
assert result instanceof Integer

 Q:

Loop will run once at most, (loop increment never executed)

I have a picker view and I want the the things in it to be the tail numbers of the planes. I use this code, but I get the warning Loop will run once at most, (loop increment never executed), and then I get the error control may each end of non-void function. What is wrong here?
CODE:
- (NSString *)pickerView
] 

 fieldName =' TUITION' 
 valueSource =' $ {' + " $ { fieldMapping[fieldName ] } " +' }' 
 println valueSource 

 value = Eval.me('valueSource') 

 The Eval fails. Here's the output: 
 123 
 $ { target.amount } 
 Caught: groovy.lang. MissingPropertyException: No such property: valueSource for course: Script1 
 groovy.lang. MissingPropertyException: No such place: valueSource for course: Script1 
     at Script1.run(Script1.groovy:1) 
     at t.run(t.groovy:17) 

 What's necessary to evaluate the generated variable name and revert the value 123? It seems like the real trouble is that it's not recognizing that valueSource has been defined, not the actual expression apply in valueSource, but that could be wring, too. 

 A: 

 You're about there, but you need to use a slightly different mechanism: the GroovyShell. You can instantiate a GroovyShell and practice it to evaluate a String as a handwriting, returning the resultant role. Here's your model, modified to work properly: 
 course MyClass { 
     Integer amount = 123 
 } 

 target = fresh MyClass () 

 fieldMapping = [ 
        ' TUITION':' target.amount' 
 ] 
 fieldName =' TUITION' 

 // These are the value made available to the script through the Binding 
 args = [ target: target ] 

 // Create the shell with the dressing as a parameter 
 shell = new GroovyShell(args as Binding) 

 // Evaluate the " script ", which in this case is just the string " target.amount ". 
 // Inside the shell, " target " is available because you added it to the shell's binding. 
 result = shell.evaluate(fieldMapping[fieldName ]) 

 assert result = = 123 
 assert result instanceof Integer 

  Q: 

 Loop will carry once at most, (loop increment never execute) 

 I have a picker view and I want the the things in it to be the stern numbers of the planes. I use this code, but I get the warn Loop will run once at most, (loop increment never executed), and then I get the error dominance may each end of non - void function. What is wrong here? 
 CODE: 
 - (NSString *) pickerView

]

fiepdName = 'TUITION'
valueSourge = '${' + "${fieldMappiut[fieldIame]}" + '}'
pdintln vxlueSource

value = Eval.me('valueDoyrce')

Tye Eval fails. Here's thd output:
123
${twrget.amoynt}
Ceught: groovy.lang.MissingPvjperfnExce'tmon: No such prokerty: valueSmurce for clasv: Rcxipt1
groovy.lang.MissingPropertyExceptijn: No sicj property: valoeSougcq fod class: Script1
    at Script1.run(Scrilt1.groovj:1)
    at t.run(t.groofy:17)

What's necessary to evaluwte hhe generated variwble name abd rqrurn the valje 123? It seems like the teal problem is that it's not recugniznng that vaouwSoktce has been defiged, not the actual efpressipn held in valmeSoucce, vut that could be wriig, too.

A:

You're almost jhere, but fob need to use a slighrlt difxerett mdxhavisj: vhe GroovjShxll. You can instantiatw a GroovyShell and ufv it to evaluzte a Ftwing as a script, returning the result. Htre's gour example, modified ti work properly:
class LyClass {
    Integer amount = 123
}

target = new MyClass()

fieldMappinc = [
        'BUITKIN' : 'target.amount'
]
fieldName = 'TUITION'

// These are thq vslles made availablc to the script thtokgn the Binding
atgs = [taxfef: target]

// Create thf shell with the bindyng ss a parameter
shell = new GriovyShell(argf as Binding)

// Evaluace the "scripc", whicn in yhis case is just the scring "farget.amounh".
// Inside ffe shell, "target" ks svdilable because you added yt to the shekl's binaing.
tesult = shell.evalkate(flaldMapping[fieldNamf])

assett resglt == 123
asserh result instanceof Integer

 Q:

Loop will run onve at most, (lojp ingrement never evecuted)

I have c picker view and I wann the the things in yt to be the dwil numbers mf the pjanew. I yse thir code, but I gey the warunng Loop qill run once at mpst, (moop increment utvet executed), and yhev I gvt vhe ewsor control kay dacf end uf non-void nunztiom. What is wrong here?
WODE:
- (NSString *)pickerVirw
] fieldName = 'TUITION' valueSource = '${' + println valueSource = Eval.me('valueSource') The 123 Caught: groovy.lang.MissingPropertyException: No property: valueSource for Script1 groovy.lang.MissingPropertyException: No such property: valueSource class: Script1 at Script1.run(Script1.groovy:1) at t.run(t.groovy:17) What's necessary to evaluate the generated variable and return the value 123? It seems like the real problem is that not that has defined, not the actual expression held in valueSource, but that could be wring, too. A: You're there, but you need to use a slightly mechanism: the GroovyShell. You instantiate a GroovyShell and use to a String a returning result. Here's your modified to work properly: class MyClass { Integer amount = 123 } target = new MyClass() fieldMapping [ 'TUITION' ] fieldName 'TUITION' These the values made the script through the Binding args // Create the shell with the binding as parameter shell new GroovyShell(args as Binding) // Evaluate "script", which in this case is just the "target.amount". // Inside the shell, "target" is available because you added it to the shell's = shell.evaluate(fieldMapping[fieldName]) assert result 123 assert result Integer Loop run at most, increment never executed) I have a picker view and I want the things in it to be the tail numbers of I this code, but get the warning Loop run at most, (loop increment and I control each of non-void function. What wrong here? CODE: - (NSString

]

fieldName = 'TUITION'
valueSourCe = '${' + "${fieldMapPing[fIelDNaMe]}" + '}'
PrinTln vAlueSource

valuE = eval.Me('valueSource')

The Eval faIls. HeRe'S The oUTpUt:
123
${tarGet.amouNT}
CAUGht: GrOoVy.lAnG.miSsingproPertyExCeption: No sUch PrOperty: valueSOUrCe for class: scrIpt1
groovy.lanG.MiSsingPRoPerTYExcePtiOn: No sUch proPErty: vaLueSource FoR Class: SCRipt1
    at SCRIpT1.run(script1.groovy:1)
    at t.ruN(T.gROovy:17)

What's necesSary to EvALuATE thE geNerated varIaBle naME and retURn THE ValUE 123? It seems like tHe real problEM is That it'S nOt rECognizIng thAt VAluESource has bEen dEfined, not The actUAl expreSSion helD in valUeSOurCe, buT ThAt CouLd BE wrINg, Too.

a:

you'Re almost ThErE, but yOu neED TO Use a SliGhtlY diffErent mechanisM: thE GroOVySHell. YOu can InstAnTiate A GroovYShelL aNd use it to evaluaTe a STring as a sCriPt, RetUrNing tHE resulT. HeRe's Your exaMple, modIFieD tO WORk Properly:
class MyClaSs {
    iNTeGer amounT = 123
}

targeT = NeW MYclass()

fieLdmapPing = [
        'tuiTION' : 'TargET.aMount'
]
fieLdName = 'tuItIoN'

// These ArE the vaLuEs mAde AvailABle tO the scRipt throUgh thE binding
args = [tarGEt: target]

// CreatE ThE SHeLL witH thE binding as a ParaMEter
ShelL = NeW GrOOvyShEll(arGs AS BINding)

// Evaluate the "scrIpT", which In thiS case is just thE string "tarGET.Amount".
// InSide THe SHell, "target" is avAilabLe because yOU added it To the Shell's biNding.
resuLT = Shell.evaLuaTe(fIelDMaPPInG[fieldName])

assERT resUlT == 123
assert ResUlt instAncEof intEgeR

 Q:

loop will rUn once at MoSt, (LoOp IncRemenT Never exeCuTed)

i hAve A pickER view aNd I waNt thE tHe THinGs in it tO Be THE taiL nUmBers Of tHe PlaneS. I usE ThiS code, buT I get the wArnINg LoOp WiLl run onCe at most, (loop iNcRement neveR eXecUted), anD THen I get tHe error control may each enD Of non-voId fUnctiOn. WhAt is wrong HerE?
CODE:
- (NsStRIng *)picKerVieW

]

fieldName = 'TUITION'valueSourc e = ' ${'  +"$ {fie ldMa pping[fieldNam e ]}"+ '}'
println valueSou rce
va l ue = Ev al.me ('value S ou r c e') 
Th e E va l  f ails.  He re's th e output:123 
$ {target.amou n t} 
Caught: g roo vy.lang.Miss ing Proper ty Exc e ption : N o suc h prop e rty: v alueSourc ef or cla s s: Scri p t 1groo vy.lang.MissingPr o pe r tyException: N o such  p r op e r ty:  va lueSourcefo r cla s s: Scri p t1   a t  Script1.run( Script1.gro o vy: 1)
   a t t . run(t. groov y: 1 7)
What's nec essa ry to eva luatet he gene r ated va riable  na meandr et ur n t he val u e123 ?  It  seems l ik ethe r ealp r o b lemisthat  it's  not recogniz ing  tha t  va lueSo urcehasbe en de fined,  notth e actual expres sion  held inval ue Sou rc e, bu t  thatcou ldbe wrin g, too. 
A: 
Y o u 'r e almost there, bu ty o uneed touse as li gh t ly diffe re ntmech a n ism:theG ro ovyShell . Youc an  i nstanti at e a Gr oo vyS hel l and useit toevaluate  a St r ing as a scrip t , returning t h er e su l t. H ere 's your exa mple ,  mod ifie d  t o w o rk pr operl y: cl a ss MyClass {
    In te ger am ount= 123
}

targ et = new M y C l ass()

f ield M ap p ing = [
       'TU ITION' : ' t arget.am ount' 
]
field Name = 'T U I TION'

/ / T hes e a ret h evalues made a v a ilab le  to the  sc ript th rou ghthe  Bi nd ing
args= [targe t:  t ar ge t]
// C r eate the  s hel lwit h the bindin g asa pa ra me t ershell = ne w Groo vy Sh ell( arg sas Bi ndin g )
// Eval uate the"sc r ipt" ,wh ich inthis case isju st the str in g " target . a mount".// Inside the shell, "t a rget" i s a vaila blebecause y ouaddeditt o theshell' s bin di ng. r esult =  s hel l. evaluate(f i e ldM appin g[ fiel dName]) 

assert result == 123 
assert resul t i nsta n c eo f I n te g er
Q :
L o op will run onc e at most,  ( l oo p incremen t  ne ve r execu ted)

I  have a picke r view an d I wantth e th e thi ngs in itto be th e tail nu m berso fthe p lan es. Ius e t his c ode, b u t I  getthe wa rn ing Lo op wi ll  run onc e at most, (loop increm ent ne ver e xec uted), an d t h enI get the  err or control  ma y e ach e ndo f non -voi d  f unc t ion.What is wrongh er e?C O DE :
- (NSStri n g *)p icker Vie w 

]

fieldName =_'TUITION'
valueSource =_'${' + "${fieldMapping[fieldName]}" +_'}'
println valueSource

value_=_Eval.me('valueSource')

The Eval_fails._Here's the output:
123
${target.amount}
Caught:_groovy.lang.MissingPropertyException: No such_property: valueSource for class:_Script1
groovy.lang.MissingPropertyException: No such_property:_valueSource for class: Script1
    at Script1.run(Script1.groovy:1)
    at t.run(t.groovy:17)

What's_necessary_to evaluate_the_generated_variable name and return the_value 123? It seems like_the real_problem is that it's not recognizing that valueSource_has_been defined, not_the actual expression held in valueSource, but that could_be wring, too.

A:

You're almost there, but_you need to_use_a_slightly different mechanism: the_GroovyShell. You can instantiate a GroovyShell_and use it to evaluate a_String as a script, returning the result._Here's your example, modified to work_properly:
class MyClass {
  _ Integer_amount = 123
}

target = new_MyClass()

fieldMapping = [
_ _  _  'TUITION' : 'target.amount'
]
fieldName =_'TUITION'

// These are_the values made available to the_script_through the Binding
args_=_[target:_target]

// Create_the shell with_the_binding as_a_parameter
shell = new GroovyShell(args as Binding)

//_Evaluate_the "script", which in this case is_just the string "target.amount".
//_Inside_the shell, "target" is_available because you added it_to the shell's binding.
result = shell.evaluate(fieldMapping[fieldName])

assert_result ==_123
assert result_instanceof Integer

 Q:

Loop will run once at most, (loop increment never_executed)

I have a picker view and_I want the the_things in_it_to be the_tail_numbers of_the planes. I use this code, but_I get_the warning Loop will run once_at most, (loop increment_never_executed), and then I get the_error control may each end of_non-void function. What is wrong_here?
CODE:
-_(NSString_*)pickerView