Passing variables across forms

I’ve been reading my Agile Dev book over and over again, but I can’t
wrap my head around how to do this. There’s a question and answer
portion site of my site. You begin the process by adding a question to
the database. After that, the program should redirect you straight to
adding an answer for that question. The problem is, I don’t know how to
keep track of the answer’s question id.

Here’s what I have now:

####################### Controller
def new
@question = Question.new
end

def create
@question = Question.new(params[:question])
if @question.save
flash[:notice] = ‘Question was successfully created.’
redirect_to :action => ‘new_answer’, :id => @question
else
render :action => ‘new’
end
end

def new_answer
# the new answer must belong to a question… so I wasn’t sure
# whether to call it new answer or add answer.
@question = Question.find(params[:id])
@answer = Answer.new
@question.answers << @answer

end

def create_answer
@answer = Answer.new(params[:question_id])
if @answer.save
flash[:notice] = ‘Answer was added to the question.’
redirect_to :action => ‘show’, :id => @question
else
render :action => ‘create_answer’
end
end
###########################

########################### new_answer.rhtml
<%= start_form_tag :action => ‘create_answer’ %>
<%= render_partial ‘form_new_answer’ %>
<%= submit_tag “Create” %>
<%= end_form_tag %>
###########################

########################### _form_new_answer.rhtml

Answer to add
<%= text_area 'answer', 'answer', {:cols=>"80", :rows=>"5"} %>

###########################

########################### answer model
class Answer < ActiveRecord::Base
belongs_to :question
validates_presence_of :answer, :question_id
end
###########################

########################### question model
class Question < ActiveRecord::Base
validates_presence_of :question
has_many :answers
end
############################

Probably too much code for what you need to know…

make sure that you have a hidden field in your form [:answer][:id], and
then
see the code for the controller below.

matt

else
  render :action => 'new'
end

end

def new_answer
# the new answer must belong to a question… so I wasn’t sure
# whether to call it new answer or add answer.
question = Question.find(params[:id])

    #there are a few ways to do this.  I think this is most straight

forward
# there is a sister method to answers_create(). One of them
# saves the new answer, and the other doesn’t, depnding on
# what you want

@answer = question.answers_create()

end

def create_answer

   # this or  answer.find(params[:answer][:id])  if you saved the
   # new answer in the 'new_answer' method

@answer = Answer.new(params[:answer])
if @answer.save
  flash[:notice] = 'Answer was added to the question.'
     # you don't have a 'show' method in this controller

  redirect_to :action => 'show', :id => @question

How do you make a hidden field?

http://api.rubyonrails.com/classes/ActionView/Helpers/FormTagHelper.html#M000408

Thanks a bunch, all my searches for it were turning up the hidden text
field.

Xavier L. wrote:

Thanks a bunch, all my searches for it were turning up the hidden text
field.

Oh ho ho, it just hit me…

No ideas on what’s up?

Thanks for the tips, but I’ve hit a bit of a wall now.
Rails crashes right after I try to add my first answer. I think it’s
passing along the values just right, because it says the parameters are

Parameters: {“answer”=>{“answer”=>“Testing 123”, “question_id”=>“10”},
“commit”=>“Create”}

The error it gives is

undefined method `stringify_keys!’ for “10”:String

####### CONTROLLER

def new_answer
# the new answer must belong to a question… so I wasn’t sure
# whether to call it new answer or add answer.
@answer = Question.find(params[:id]).answers.create
end

def create_answer
@answer = Answer.new(params[:answer][:question_id])
if @answer.save
flash[:notice] = ‘Answer was added to the question.’
redirect_to :action => ‘list’
else
redirect_to :action => ‘list’
end
end

Xavier L. wrote:

Parameters: {“answer”=>{“answer”=>“Testing 123”, “question_id”=>“10”},
“commit”=>“Create”}

The error it gives is

undefined method `stringify_keys!’ for “10”:String

def create_answer
@answer = Answer.new(params[:answer][:question_id])
if @answer.save
flash[:notice] = ‘Answer was added to the question.’
redirect_to :action => ‘list’
else
redirect_to :action => ‘list’
end
end

based on the params, this line would resolve to this…

 @answer = Answer.new(10)

This is probably where your trouble begins…You probably want this…

 @answer = Answer.new(params[:answer])

_Kevin

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