Help needed to create a complex form

Hi
My models are message_thread, message, document (document with
attachments I am using paperclip)

message_thread

has_many messages

message

belongs_to message_thread
has_many :document_messages
has_many :documents, :through => :document_messages

document

has_attached_file :attachment,
:storage => :database
has_many :document_messages
has_many :messages, :through => :document_messages

 What i need is to create a message_thread with one message and that

message with 2(or more) attachments. I tried like

messages_controller

def new
@message_thread = MessageThread.new
@message = @message_thread.messages.build
end

new.html.erb

<%form_for @message_thread, :url => { :action => “create” },:html =>
{:multipart => true,:class => “mail-tenant”} do |f| %>

<%= f.text_field :mail_to %>



<% f.fields_for :messages do |message| %>
<%= message.label :subject,‘Subject’ %>
<%= message.text_field :subject,:maxlength => 255 %>



Attachments:


<% message.fields_for :documents do |document| %>

<%= document.file_field :attachment,:class => “file” %>
<%= document.hidden_field :company_id,:value =>
current_company.try(:id)%>

<%end%>
<%end%>


Send

Or Cancel


<%end%>
       But I am getting error

ActiveRecord::AssociationTypeMismatch in MessagesController#create

Document(#-614356858) expected, got Array(#-608120208)

Please help me to solve this. I have a vague idea of using
accepts_nested_attributes_for . But please tell here can I use it

Thanks in advance

Tom

Hi,

There is an example for nested file upload form by using paperclip.
The codes are similar to you, be attention to the usage of
accepts_nested_attributes_for.

Check it here:
http://rails-bestpractices.com/posts/45-use-sti-and-polymorphic-model-for-multiple-uploads

Hi
Thanks for replying.I could do it partially with the following
modifications to my models and views

message_thread

has_many messages
accepts_nested_attributes_for :messages

message

belongs_to message_thread
has_many :document_messages
has_many :documents, :through => :document_messages
accepts_nested_attributes_for :documents,:reject_if => lambda {|a|
a[:attachment].blank?}
validates_presence_of :subject

  No other change. But the  problem is from the view I am not 

selecting any file for upload and not entering values for ‘subject’ .
So surely the validation will fail and rerender my new action . My
‘create’ action like

def create
@message_thread = MessageThreads.new(params[:message_thread])
if @message_thread.save
flash[:notice] = “Message sent successfully”
redirect_to home_url
else
flash.now[:error] = @message_thread.errors.full_messages.join("
")
render :action => ‘new’
end
end

  The problem is now the file_field disappears. What might be the 

cause?I am struggling with this for hours.Please help

Thanks

Hi,

Be sure you have build the document for message before you use it.

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