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Andrew Miehs

2011-Apr-14 18:30 UTC

Is there a serialization Example for Rails 3.0?

Hi all,

I am new to ruby and rails coming from a perl background.

I was hoping someone could help point me to some sample code to serialize data
from a form.
My plan is to write a tiny app to generate Cisco switch configuration files
based on a template.

Below is what I have found so far based on what I could find.

Unfortunately the form does not automagically re-insert the values after they
are saved. I noticed other people commenting about the same feature. Is there a
better way of doing this?

How would I create an array of vlans under the variable configuration using the
form?
I am planning on adding an "add vlan" button which reloads the same
form, but I am not sure of the syntax.

Any pointers would be helpful.

Thanks in advance,

Regards

Andrew


---

=== switch.rb ==class Switch < ActiveRecord::Base
  serialize :configuration
end

=== _form.html.erb ==<%= form_for(@switch) do |f| %>
  <% if @switch.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@switch.errors.count, "error") %>
prohibited this switch from being saved:</h2>

      <ul>
      <% @switch.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>		
  </div>


    <%= f.fields_for :configuration do |c| %>
        <%= c.text_field :snmpCommunity %>
        <%= c.text_field :ipAddress %>
    <% end %>


  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

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Frederick Cheung

2011-Apr-14 21:38 UTC

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Re: Is there a serialization Example for Rails 3.0?

On 14 Apr 2011, at 19:30, Andrew Miehs
<andrew-64B0ZDxNVfizQB+pC5nmwQ@public.gmane.org> wrote:
> Hi all,
> 
> I am new to ruby and rails coming from a perl background.
> 
> I was hoping someone could help point me to some sample code to serialize
data from a form.
> My plan is to write a tiny app to generate Cisco switch configuration files
based on a template.
> 
> Below is what I have found so far based on what I could find.
> 
> Unfortunately the form does not automagically re-insert the values after
they are saved. I noticed other people commenting about the same feature. Is
there a better way of doing this?
> 
You might try passing @switch.configuration, :configuration to fields_for. Why
use serialize though, rather than make those things attributes of the switches
table?
> How would I create an array of vlans under the variable configuration using
the form?
> I am planning on adding an "add vlan" button which reloads the
same form, but I am not sure of the syntax.
> If vlans are a separate table (with an association with switches) then
accepts_nested_attributed makes this sort of thing pretty easy. I believe
there''s a railcard that covers one way of handling the client side
portion of adding new form thingies on the fly

Fred
> Any pointers would be helpful.
> 
> Thanks in advance,
> 
> Regards
> 
> Andrew
> 
> 
> ---
> 
> === switch.rb ==> class Switch < ActiveRecord::Base
>  serialize :configuration
> end
> 
> === _form.html.erb ==> <%= form_for(@switch) do |f| %>
>  <% if @switch.errors.any? %>
>    <div id="error_explanation">
>      <h2><%= pluralize(@switch.errors.count, "error")
%> prohibited this switch from being saved:</h2>
> 
>      <ul>
>      <% @switch.errors.full_messages.each do |msg| %>
>        <li><%= msg %></li>
>      <% end %>
>      </ul>
>    </div>
>  <% end %>
> 
>  <div class="field">
>    <%= f.label :name %><br />
>    <%= f.text_field :name %>        
>  </div>
> 
> 
>    <%= f.fields_for :configuration do |c| %>
>        <%= c.text_field :snmpCommunity %>
>        <%= c.text_field :ipAddress %>
>    <% end %>
> 
> 
>  <div class="actions">
>    <%= f.submit %>
>  </div>
> <% end %>
> 
> -- 
> You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
> To post to this group, send email to
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> To unsubscribe from this group, send email to
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> For more options, visit this group at
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> 
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Andrew Miehs

2011-Apr-15 00:07 UTC

head link

Re: Is there a serialization Example for Rails 3.0?

Hi Fred,

On 14/04/2011, at 11:38 PM, Frederick Cheung wrote:>> Unfortunately the form does not automagically re-insert the values
after they are saved. I noticed other people commenting about the same feature.
Is there a better way of doing this?
>> 
> 
> You might try passing @switch.configuration, :configuration to fields_for.
Why use serialize though, rather than make those things attributes of the
switches table?
I do not want to use attributes as there are not only 2 but about 20, and
additional ones may come at a later stage.
I am not quite sure what you mean by the above statement....

Changing
    <%= f.fields_for :configuration do |c| %>
to
    <%= f.fields_for @switch.configuration, :configuration do |c| %>
gives
	undefined method `model_name'' for NilClass:Class

Unfortunately I am currently trying to work out how the rails framework fits
together while learning ruby syntax at the same time..
>> How would I create an array of vlans under the variable configuration
using the form?
>> I am planning on adding an "add vlan" button which reloads
the same form, but I am not sure of the syntax.
>> 
> If vlans are a separate table (with an association with switches) then
accepts_nested_attributed makes this sort of thing pretty easy. I believe
there''s a railcard that covers one way of handling the client side
portion of adding new form thingies on the fly
I don''t actually want to do anything with this data other than running
it through a template. That is why I was looking at the following type
structure:

name = mySwitch
configuration = 
	{snmpCommunity = public},
	{ipAddress = 10.0.0.1},
	{value1 = x}
	{vlan = [ { id = 1, name = Vlan1 }, { id = 2, name = Vlan2 }]}

etc etc...

I don''t really want to bother normalising the data as this structure
may change quite often....


I am trying to do this in Rails so that I get a chance to learn a little about
the framework...

Thanks for any comments.

Regards

Andrew

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Rails - Apr 2011 - Is there a serialization Example for Rails 3.0?

Is there a serialization Example for Rails 3.0?

Re: Is there a serialization Example for Rails 3.0?

Re: Is there a serialization Example for Rails 3.0?