Picking up variable-name params in Rails form?

Question

My form generates a field for each member of a variable-length collection and assigns the input field the ID of the collection member ID. I.e.,

<input type="text" id="1" val="Value for collection member with id #1">
<input type="text" id="5" val="Value for collection member with id #5">

In the controller I'm trying to pick up these values by iterating over the collection like this:

  collectors.each do |col|
    amount = params[col.id]
    # ...process this value
  end

But I'm getting a nil value error at amount = params[col.id]. How can I access these variables?

EDIT I just changed it so I use javascript to generate a array of hashes of the KV pairs and stick it into a hidden field so my controller can evaluate that. It works but from a security perspective, how awful is this?

shweta · Accepted Answer · 2013-01-04 07:10:27Z

1

replace

<input type="text" id="1" val="Value for collection member with id #1">
<input type="text" id="5" val="Value for collection member with id #5">

with

<input type="text" id="1" name="1" val="Value for collection member with id #1">
<input type="text" id="5" name="5" val="Value for collection member with id #5">

In the controller

collectors.each do |col|
  amount = params[col.id] if params[col.id]
  # ...process this value
end

edited Jan 4, 2013 at 7:10

answered Jan 4, 2013 at 6:17

shweta

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1 Comment

user1436111 Over a year ago

Actually, nevermind, it's the same error :/ Is there a better way to do this?

neon · Accepted Answer · 2013-01-04 07:20:36Z

0

instead of using "each" try:

amount = collectors.map(&:id)

answered Jan 4, 2013 at 7:20

neon

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2 Comments

user1436111 Over a year ago

that will just yield an array of amount values, right? How do I know which is associated with each id?

neon Over a year ago

I'm not sure I fully understand what your form output is supposed to be. Could you elaborate on that? How are you generating the input fields?

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