Setting values using reflection
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I've been playing with smalltalk casually now, for months and really like it. But I"m
clearly still a newb. I've reached the point in a small project where I want to set the values on my object based on the values that are in a dictionary. The dictionary is filled with a set of keys that represent attributes on the object. So for a simple example, imagine I have an object which has accessors for 'title' and 'title:'. I want to iterate across the set of keys, being certain that each key is a valid msg to send to myOBject. The send the object the message with the value from the dictionary. Now, I understand that I can do: myObject perform: 'title' asSymbol. and use that as a way to message myObject with the selector 'title' As I understand it this is equivalent to getting the value with: myObject title What I've looked for an been unable to find is how to set the value. What is the equivalent to: myOBject title: 'A new title'. using perform? Thank you for your help. Tony |
Re: Setting values using reflection
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anObject perform: (mySymbol, ':' ) asSymbol with: aValue
stef On Jul 18, 2011, at 9:59 PM, tgiaccone wrote: > I've been playing with smalltalk casually now, for months and really like it. > But I"m > clearly still a newb. > > I've reached the point in a small project where I want to set the values on > my object based on the values that are in a dictionary. The dictionary is > filled > with a set of keys that represent attributes on the object. So for a simple > example, > imagine I have an object which has accessors for 'title' and 'title:'. > > I want to iterate across the set of keys, being certain that each key is a > valid msg > to send to myOBject. The send the object the message with the value from the > dictionary. > > Now, I understand that I can do: > > myObject perform: 'title' asSymbol. > > and use that as a way to message myObject with the selector 'title' > > As I understand it this is equivalent to getting the value with: > > myObject title > > What I've looked for an been unable to find is how to set the value. > > What is the equivalent to: > > myOBject title: 'A new title'. > > using perform? > > Thank you for your help. > > > Tony > > -- > View this message in context: http://forum.world.st/Setting-values-using-reflection-tp3676289p3676289.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > |
Re: Setting values using reflection
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As Stef said, you can use #perform:with: or #perform:with:with: or #perform:with:with:with:
or..... #perform: selector withArguments: argArray :) On Mon, Jul 18, 2011 at 10:41 PM, Stéphane Ducasse <[hidden email]> wrote: anObject perform: (mySymbol, ':' ) asSymbol with: aValue -- Mariano http://marianopeck.wordpress.com |
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brilliant, thank you very much.
Tony
On Mon, Jul 18, 2011 at 4:47 PM, Mariano Martinez Peck <[hidden email]> wrote: As Stef said, you can use #perform:with: or #perform:with:with: or #perform:with:with:with: |
Re: Setting values using reflection
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In reply to this post by Stéphane Ducasse
On 18 juil. 2011, at 22:41, Stéphane Ducasse wrote: > anObject perform: (mySymbol, ':' ) asSymbol with: aValue A bit more "user-friendly", or less intention-revealing if you wish: anObject perform: mySymbol asMutator with: aValue #asMutator does the same thing as in the above snippet. Also just from the subject I first thought you wanted to set instance variables so here it is for the record :) #instVarAt:put: and #instVarNamed:put: also in class Object > stef > > On Jul 18, 2011, at 9:59 PM, tgiaccone wrote: > >> I've been playing with smalltalk casually now, for months and really like it. >> But I"m >> clearly still a newb. >> >> I've reached the point in a small project where I want to set the values on >> my object based on the values that are in a dictionary. The dictionary is >> filled >> with a set of keys that represent attributes on the object. So for a simple >> example, >> imagine I have an object which has accessors for 'title' and 'title:'. >> >> I want to iterate across the set of keys, being certain that each key is a >> valid msg >> to send to myOBject. The send the object the message with the value from the >> dictionary. >> >> Now, I understand that I can do: >> >> myObject perform: 'title' asSymbol. >> >> and use that as a way to message myObject with the selector 'title' >> >> As I understand it this is equivalent to getting the value with: >> >> myObject title >> >> What I've looked for an been unable to find is how to set the value. >> >> What is the equivalent to: >> >> myOBject title: 'A new title'. >> >> using perform? >> >> Thank you for your help. >> >> >> Tony >> >> -- >> View this message in context: http://forum.world.st/Setting-values-using-reflection-tp3676289p3676289.html >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> > > -- Simon Denier |
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