Associated join data save problem

Rails
1

Hiiii,

I have created one migration…

class TagContentMasterJoin < ActiveRecord::Migration
def self.up
create_table ‘content_masters_tags’ do |t|
t.column ‘tag_id’, :integer
t.column ‘content_master_id’, :integer
t.timestamps
end
end

def self.down
drop_table ‘content_masters_tags’
end
end
for joining two tables
and in content_master view new want to save associated tag in the
above table for that i have written this code in content_master view
new

<% for tag in Tag.find(:all)  %>
<%=check_box_tag "content_master[tag_id][]", tag.id, @content_master.tags.include?(tag) %> <%= tag.name %>
<% end %>

and in my create function of content master controller following code
is present …
def create
@content_master = ContentMaster.new
@content_master.tags=params[:content_master][:tag_id]
respond_to do |format|
if @content_master.save
#save images
and some code here

but this all giving me this error
ActiveRecord::AssociationTypeMismatch in Content
mastersController#create

Tag(#46439460) expected, got String(#21132310)

RAILS_ROOT: D:/TestingGeek/trunk/Site
Application Trace | Framework Trace | Full Trace

C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/
associations/association_proxy.rb:262:in raise_on_type_mismatch' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/ associations/association_collection.rb:320:inreplace’
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/
associations/association_collection.rb:320:in each' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/ associations/association_collection.rb:320:inreplace’
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/
associations.rb:1325:in tags=' D:/TestingGeek/trunk/Site/app/controllers/ content_masters_controller.rb:64:increate’

and in my model code is
has_and_belongs_to_many :content_masters
has_and_belongs_to_many :tags

i have give as respective model…

please help this is urgent…

thanks

rahul…

2

I assume that u r following models:

class ContentMaster < ActiveRecord::Base
has_and_belongs_to_many :tags
end

class Tags < ActiveRecord::Base
has_and_belongs_to_many :content_masters
end

change ur view as:

   <% for tag in Tag.find(:all)  %>
   <div>
           <%=check_box_tag "content_master[tag_id*s*][]", tag.id,
           @content_master.tags.include?(

tag) %>
<%= tag.name %>

   </div>
   <% end %>

Carefully look on the above code, I have changed tag_id to tag_ids.

Then you have to change the create method as follows:
def create
@content_master = ContentMaster.new(params[:content_master])

 respond_to do |format|
 if @content_master.save
   #save images

The above code will perfectly work

3

Hiii K Arunmohan

thanks for reply…

i have change id to ids

but in controller create i can’t do the exact same
because me having following code in my controller

def create
@content_master = ContentMaster.new
@content_master.title = params[:title]
@content_master.abstract_text = params[:abstract_text]
#@content_master.image_path = imageObject.original_path
@content_master.content_text = params[:content_text]
@content_master.promote= params[:promote]
@content_master.promote_block= params[:promote_block]
@content_master.draft_state= params[:draft_state]
@content_master.parent_id=params[:content_master][:parent_id]
@content_master.tags=params[:content_master][:tag_ids]

if(params[:order_no_article]==’’)
@content_master.order_no_article = 0
else
@content_master.order_no_article = params[:order_no_article]
end

@content_master.promote = params[:promote]

#@metadata = @content_master.metadata.build(params[:metadata ])
respond_to do |format|
  if @content_master.save

and it is still giving the same error…

please suggest the solution…

thanks

rahul

4

changing from id to ids will get assigned value implicitly.

Check the 32 and 33rd slide of the following URL:

It may useful to you.

5

Please Help…

6

Hiii K Arunmohan,

Now Add form is working by changing…
@content_master.tags=params[:content_master][:tag_ids]
@content_master.tag_ids=params[:content_master][:tag_ids]

tags to tag_ids

but in edit form there is one problem…
when there is last entry which is selected and i want to unassign it ,
it
dont do…

why it is not doing…

in update method m having this simple code
def update
@content_master = ContentMaster.find(params[:id])

respond_to do |format|
  if @content_master.update_attributes(params[:content_master])

i tried this below this
@content_master.tags.delete_all(params[:content_master]
[:tag_ids]).each{|i|@content_master.tags << Tag.find(i)}

but it is giving error of wrong number of argument…

please help…

thanks

rahul