From: Andrea Dallera <andrea@...>
Date: 2010-04-02T03:35:19+09:00
Subject: Re: Dynamic Method Calls

Whoopsie, i'm really sorry. It should be something like:

c.send("#{k}=".to_sym, v)

On Thursday 01 April 2010 08:13:07 pm Matt Mencel wrote:
> Right now I have some inefficient code that looks like this...
> 
> LdapAccount is my model.... and record.attributes is a hash of attribute
>  name,value pairs.
> 
> 
> records.each do |record|
>       LdapAccount.create(:uid => record.attributes["uid"].to_s) do |c|
>         c.buildingname = record.attributes["buildingName"].to_s if
>  record.attributes.has_key?("buildingName") c.cn =
>  record.attributes["cn"].to_s if record.attributes.has_key?("cn")
>  c.department = record.attributes["department"].to_s if
>  record.attributes.has_key?("department") c.displayname =
>  record.attributes["displayName"].to_s if
>  record.attributes.has_key?("displayName") c.employeetype =
>  record.attributes["employeeType"].to_s if
>  record.attributes.has_key?("employeeType") c.givenname =
>  record.attributes["givenName"].to_s if
>  record.attributes.has_key?("givenName") c.homedirectory =
>  record.attributes["homeDirectory"].to_s if
>  record.attributes.has_key?("homeDirectory") c.mail =
>  record.attributes["mail"].to_s if record.attributes.has_key?("mail") end
> end
> 
> 
> There's probably 20 or more attributes I'll eventually be checking...I'm
>  working with tens of thousands of records....and not all records have
>  values for every attribute.  So rather than do all the extra wasted work,
>  I'd really like to be able to do something simpler like this...
> 
> records.each do |record|
>       LdapAccount.create(:uid => record.attributes["uid"].to_s) do |c|
>           record.attributes.each_pair do |k,v|
>               c.k = v
>           end
>       end
> end
> 
> ...but I get...
> undefined method `k=' for #<LdapAccount:.....>
> 
> Did a little research and read about the send method....so I tried this...
> 
> c.send(k = v)
> 
> 
> ...but I get... (in this case the String value of v = "smtp.wiu.edu")
> ["smtp.wiu.edu"] is not a symbol
> 
> 
> So I'm not sure I understand how to use the send method in this case.  Can
>  anyone offer some insight?  Am I headed in the right direction or is there
>  a better way to do this.
> 
> Thanks,
> Matt
>