Hello,
I think this is an easy one for the average Rails developer but I''m a
bit stuck.
I''m creating a simple voting app: any user can create a survey, with
any number of questions, and other users can then vote by creating a ballot for
that survey.
Here''s the modeling:
class Survey < ActiveRecord::Base
has_many :questions
has_many :eligibilities
has_many :ballots
accepts_nested_attributes_for :questions, :allow_destroy => true
attr_accessible :title, :description, :status, :deadline,
:questions_attributes
def owner
Person.find(owner_id)
end
end
class Question < ActiveRecord::Base
belongs_to :survey
has_many :preferences
end
class Ballot < ActiveRecord::Base
belongs_to :survey
has_many :preferences
end
class Preference < ActiveRecord::Base
belongs_to :ballot
belongs_to :question
end
To be clear: a survey is the set of questions and a ballot is a voter''s
set of answers (preferences).
I''m using the nested route: /surveys/[:survey_id]/ballot/new for the
voting page.
What I''m having trouble with is pre-populating the ballot with empty
preferences. When ballot/new is called, I do this:
def new
@survey = Survey.find(params[:survey_id])
@ballot = @survey.ballots.build
# Prepare the ballot
for question in @ballot.survey.questions
p = Preference.new
p.ballot = @ballot
p.question = question
@ballot.preferences << p
end
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @ballot }
end
end
and on the ballot/new.html.erb page, I try this:
<%= form_for [@survey, @ballot] do |f| %>
<%= f.fields_for :preferences do |preference_form| %>
<%= preference_form.fields_for :question do |question_form| %>
<p>
<%= question_form.label :question %><br />
<%= radio_button("preference", "preference",
"Yes") %> Yes
<%= radio_button("preference", "preference",
"No") %> No
<%= radio_button("preference", "preference",
"Decline") %> Decline
</p>
<% end %>
<% end %>
<div class="actions">
<%= f.submit "Vote" %>
</div>
<% end %>
But this merely shows one set of radio buttons with no question text, though
I''ve confirmed the @survey.questions are populated with questions.
Does anybody see what I''m doing wrong here? My guess is looking at the
new.html.erb is going to really show off something incorrect.
Christopher Thielen
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I think this is related to
http://stackoverflow.com/questions/5914736/rails-3-undefined-method-model-name-for-arrayclass
.
I decided to change my ../ballot/new controller to:
def new
@survey = Survey.find(params[:survey_id])
@ballot = @survey.ballots.build
# Prepare the ballot
@ballot.preferences = @survey.questions.map{|question|
question.preferences.build}
#for question in @ballot.survey.questions
# p = Preference.new
# p.ballot = @ballot
# p.question = question
# @ballot.preferences << p
#end
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @ballot }
end
end
And the new view to:
<%= form_for [@survey, @ballot] do |f| %>
<%=h @ballot.preferences[0].question.inspect %>
<%= f.fields_for @ballot.preferences do |preference_form| %>
<%= preference_form.fields_for :question do |question_form| %>
<p>
<%= question_form.label :question %><br />
<%= radio_button("preference", "preference",
"Yes") %> Yes
<%= radio_button("preference", "preference",
"No") %> No
<%= radio_button("preference", "preference",
"Decline") %> Decline
</p>
<% end %>
<% end %>
<div class="actions">
<%= f.submit "Vote" %>
</div>
<% end %>
And now I receive the error:
undefined method `model_name'' for Array:Class
for the fields_for line.
My guess is @ballot.preferences isn''t a proper set of instances but
just an array, though my Ruby on Rails skills aren''t good enough to
figure this out. Any ideas?
On Jul 10, 2011, at 11:14 PM, Christopher Thielen wrote:
> Hello,
>
> I think this is an easy one for the average Rails developer but
I''m a bit stuck.
>
> I''m creating a simple voting app: any user can create a survey,
with any number of questions, and other users can then vote by creating a ballot
for that survey.
>
> Here''s the modeling:
>
> class Survey < ActiveRecord::Base
> has_many :questions
> has_many :eligibilities
> has_many :ballots
>
> accepts_nested_attributes_for :questions, :allow_destroy => true
>
> attr_accessible :title, :description, :status, :deadline,
:questions_attributes
>
> def owner
> Person.find(owner_id)
> end
> end
>
> class Question < ActiveRecord::Base
> belongs_to :survey
> has_many :preferences
> end
>
> class Ballot < ActiveRecord::Base
> belongs_to :survey
> has_many :preferences
> end
>
> class Preference < ActiveRecord::Base
> belongs_to :ballot
> belongs_to :question
> end
>
> To be clear: a survey is the set of questions and a ballot is a
voter''s set of answers (preferences).
>
> I''m using the nested route: /surveys/[:survey_id]/ballot/new for
the voting page.
>
> What I''m having trouble with is pre-populating the ballot with
empty preferences. When ballot/new is called, I do this:
>
> def new
> @survey = Survey.find(params[:survey_id])
>
> @ballot = @survey.ballots.build
>
> # Prepare the ballot
> for question in @ballot.survey.questions
> p = Preference.new
> p.ballot = @ballot
> p.question = question
> @ballot.preferences << p
> end
>
> respond_to do |format|
> format.html # new.html.erb
> format.xml { render :xml => @ballot }
> end
> end
>
> and on the ballot/new.html.erb page, I try this:
>
> <%= form_for [@survey, @ballot] do |f| %>
> <%= f.fields_for :preferences do |preference_form| %>
> <%= preference_form.fields_for :question do |question_form| %>
> <p>
> <%= question_form.label :question %><br />
> <%= radio_button("preference", "preference",
"Yes") %> Yes
> <%= radio_button("preference", "preference",
"No") %> No
> <%= radio_button("preference", "preference",
"Decline") %> Decline
> </p>
> <% end %>
> <% end %>
>
> <div class="actions">
> <%= f.submit "Vote" %>
> </div>
> <% end %>
>
> But this merely shows one set of radio buttons with no question text,
though I''ve confirmed the @survey.questions are populated with
questions.
>
> Does anybody see what I''m doing wrong here? My guess is looking at
the new.html.erb is going to really show off something incorrect.
>
> Christopher Thielen
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I was able to resolve this problem. For those curious: http://stackoverflow.com/questions/6656872/activerecord-building-for-nested-resource On Jul 11, 2011, at 11:09 AM, Christopher Thielen wrote:> I think this is related to http://stackoverflow.com/questions/5914736/rails-3-undefined-method-model-name-for-arrayclass . > > I decided to change my ../ballot/new controller to: > > def new > @survey = Survey.find(params[:survey_id]) > > @ballot = @survey.ballots.build > > # Prepare the ballot > @ballot.preferences = @survey.questions.map{|question| question.preferences.build} > #for question in @ballot.survey.questions > # p = Preference.new > # p.ballot = @ballot > # p.question = question > # @ballot.preferences << p > #end > > respond_to do |format| > format.html # new.html.erb > format.xml { render :xml => @ballot } > end > end > > And the new view to: > > <%= form_for [@survey, @ballot] do |f| %> > <%=h @ballot.preferences[0].question.inspect %> > > <%= f.fields_for @ballot.preferences do |preference_form| %> > <%= preference_form.fields_for :question do |question_form| %> > <p> > <%= question_form.label :question %><br /> > <%= radio_button("preference", "preference", "Yes") %> Yes > <%= radio_button("preference", "preference", "No") %> No > <%= radio_button("preference", "preference", "Decline") %> Decline > </p> > <% end %> > <% end %> > > <div class="actions"> > <%= f.submit "Vote" %> > </div> > <% end %> > > And now I receive the error: > undefined method `model_name'' for Array:Class > > for the fields_for line. > > My guess is @ballot.preferences isn''t a proper set of instances but just an array, though my Ruby on Rails skills aren''t good enough to figure this out. Any ideas? > > On Jul 10, 2011, at 11:14 PM, Christopher Thielen wrote: > >> Hello, >> >> I think this is an easy one for the average Rails developer but I''m a bit stuck. >> >> I''m creating a simple voting app: any user can create a survey, with any number of questions, and other users can then vote by creating a ballot for that survey. >> >> Here''s the modeling: >> >> class Survey < ActiveRecord::Base >> has_many :questions >> has_many :eligibilities >> has_many :ballots >> >> accepts_nested_attributes_for :questions, :allow_destroy => true >> >> attr_accessible :title, :description, :status, :deadline, :questions_attributes >> >> def owner >> Person.find(owner_id) >> end >> end >> >> class Question < ActiveRecord::Base >> belongs_to :survey >> has_many :preferences >> end >> >> class Ballot < ActiveRecord::Base >> belongs_to :survey >> has_many :preferences >> end >> >> class Preference < ActiveRecord::Base >> belongs_to :ballot >> belongs_to :question >> end >> >> To be clear: a survey is the set of questions and a ballot is a voter''s set of answers (preferences). >> >> I''m using the nested route: /surveys/[:survey_id]/ballot/new for the voting page. >> >> What I''m having trouble with is pre-populating the ballot with empty preferences. When ballot/new is called, I do this: >> >> def new >> @survey = Survey.find(params[:survey_id]) >> >> @ballot = @survey.ballots.build >> >> # Prepare the ballot >> for question in @ballot.survey.questions >> p = Preference.new >> p.ballot = @ballot >> p.question = question >> @ballot.preferences << p >> end >> >> respond_to do |format| >> format.html # new.html.erb >> format.xml { render :xml => @ballot } >> end >> end >> >> and on the ballot/new.html.erb page, I try this: >> >> <%= form_for [@survey, @ballot] do |f| %> >> <%= f.fields_for :preferences do |preference_form| %> >> <%= preference_form.fields_for :question do |question_form| %> >> <p> >> <%= question_form.label :question %><br /> >> <%= radio_button("preference", "preference", "Yes") %> Yes >> <%= radio_button("preference", "preference", "No") %> No >> <%= radio_button("preference", "preference", "Decline") %> Decline >> </p> >> <% end %> >> <% end %> >> >> <div class="actions"> >> <%= f.submit "Vote" %> >> </div> >> <% end %> >> >> But this merely shows one set of radio buttons with no question text, though I''ve confirmed the @survey.questions are populated with questions. >> >> Does anybody see what I''m doing wrong here? My guess is looking at the new.html.erb is going to really show off something incorrect. >> >> Christopher Thielen >-- 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 rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
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