From string to field name

Rails
1

I have something like this:
for xx in ‘01’…‘09’
field_name=‘field’+xx
puts ModelName.field_name
end

My problem is that ModelName has no field named field_name, it have
fields like field01, field02,…,field09. So, how do I transform a
string in a field name?

It might be a trivial solution, but I can’t find it. I would
appreciate any help.

2

I am trying to access those fields

3

What exactly are you trying to do with this?

On Fri, May 14, 2010 at 2:24 PM, Viorel [email protected] wrote:

It might be a trivial solution, but I can’t find it. I would
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

–

Joshua S. Martin

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4

On May 14, 9:26 pm, Joshua M. [email protected] wrote:

What exactly are you trying to do with this?
I am trying to access these fields

5

Thank you Michel! I works!

6

On 14 May 2010 19:24, Viorel [email protected] wrote:

My problem is that ModelName has no field named field_name, it have
fields like field01, field02,…,field09. So, how do I transform a
string in a field name?

puts ModelName.send(field_name)

7

Or model_name.read_attribute(field_name)

However if you multiple fields like that, it sounds like you need a
has_many relationship.

has_many :field_names

object.field_names.each do |field_mame|

do something

end

8

On May 14, 10:10 pm, David [email protected] wrote:

Great. Now normalize your database schema to get rid of those repeating
fields.

You are absolutely right, both of you. It is not my schema, but I hope
that your answers will persuade those responsible. Than you!

9

[Please quote when replying]

Viorel wrote:

Thank you Michel! I works!

Great. Now normalize your database schema to get rid of those repeating
fields.

Best,

Marnen Laibow-Koser
http://www.marnen.org
[email protected]