Hey, I''m trying to achieve something relatively simple and missing
something that is probably very simple, which I''m loosing my head over.
My situation is the following: I have two tables:
-education_plans
-students
Each student has_one ed_plan and each ed_plan belongs to one student.
What I''m trying to achieve is on the form when new ed_plan is created,
I
want to have a text box where I can enter st_id(not primary key of the
students table, my own id created for each student). Then the call is
made to the get_student_info method where student info is pulled and
associated with the education plan. This is where the problem is because
I render text or template from get_student_info method fine, but how do
I at the same time associate returned info about the student with
ed_plan.
I''ve tried number of various combinations and I just can''t get
it to
work. I''m really hoping you guys can help me out.
So my new view on ed_plans looks like this:
<% form_for(@education_plan) do |f| %>
<%= f.error_messages %>
<table>
<tr>
<td>Student name</td>
<td>Student ID</td>
<td>Grade</td>
</tr>
<tr>
<td><div id="student_info"></div></td>
<td><%=text_field_tag :st_id %></td>
<%= observe_field(:st_id, :frequency => 0.25, :update =>
:student_id,
:url =>{:action => :get_student_info}, :with =>
''st_id'') %>
<td><div id="student_grade"></div></td>
</tr>
<tr>
<td><%= f.label :comments %></td>
<td><%= f.text_area(:comments, :cols => 30, :rows => 4)
%></td>
</tr>
<tr>
<td><%= f.label :service_code %></td>
<td><%= f.text_field(:service_code, :size =>3) %></td>
</tr>
<tr>
<td><%= f.label :school_number %></td>
<td><%= f.text_field(:school_number, :size =>3) %></td>
</tr>
</table>
<%= f.submit ''Create''%>
the get_student_info methods looks like this:
def get_student_info
@student = Student.find_by_osis(params[:osis])
# @education_plan.student_id = @student
return @student
end
Also, one thing I couldn''t get that if I uncomment the line #
@education_plan.student_id = @student I get error method not available
for nil object, which is very weird because that method is in the
EducationPlan controller.
THanks for you help...
--
Posted via http://www.ruby-forum.com/.
On Sat, Oct 24, 2009 at 7:09 PM, Misiek Sz <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Hey, I''m trying to achieve something relatively simple and missing > something that is probably very simple, which I''m loosing my head over. > My situation is the following: I have two tables: > -education_plans > -students > Each student has_one ed_plan and each ed_plan belongs to one student. > What I''m trying to achieve is on the form when new ed_plan is created, I > want to have a text box where I can enter st_id(not primary key of the > students table, my own id created for each student). Then the call is > made to the get_student_info method where student info is pulled and > associated with the education plan. This is where the problem is because > I render text or template from get_student_info method fine, but how do > I at the same time associate returned info about the student with > ed_plan. > I''ve tried number of various combinations and I just can''t get it to > work. I''m really hoping you guys can help me out. > So my new view on ed_plans looks like this: > <% form_for(@education_plan) do |f| %> > <%= f.error_messages %> > <table> > <tr> > <td>Student name</td> > <td>Student ID</td> > <td>Grade</td> > </tr> > <tr> > <td><div id="student_info"></div></td> > > > <td><%=text_field_tag :st_id %></td> > > <%= observe_field(:st_id, :frequency => 0.25, :update => > :student_id, > :url =>{:action => :get_student_info}, :with => > ''st_id'') %> > <td><div id="student_grade"></div></td> > </tr> > <tr> > <td><%= f.label :comments %></td> > <td><%= f.text_area(:comments, :cols => 30, :rows => 4) %></td> > </tr> > <tr> > <td><%= f.label :service_code %></td> > <td><%= f.text_field(:service_code, :size =>3) %></td> > </tr> > <tr> > <td><%= f.label :school_number %></td> > <td><%= f.text_field(:school_number, :size =>3) %></td> > </tr> > > > </table> > <%= f.submit ''Create''%> > > the get_student_info methods looks like this: > def get_student_info > @student = Student.find_by_osis(params[:osis]) > # @education_plan.student_id = @student > return @student > end > > Also, one thing I couldn''t get that if I uncomment the line # > @education_plan.student_id = @student I get error method not available > for nil object, which is very weird because that method is in the > EducationPlan controller.The error message says that you''re calling a method on a nil object. If you uncomment that line, you will be calling the student_id method on @education_plan instance, but @education_plan is nil there. -- Leonardo Mateo. There''s no place like ~
Leonardo Mateo wrote:> On Sat, Oct 24, 2009 at 7:09 PM, Misiek Sz > <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >> made to the get_student_info method where student info is pulled and >> �<tr> >> � �<%= observe_field(:st_id, :frequency => 0.25, :update => >> � �<td><%= f.label :service_code %></td> >> >> EducationPlan controller. > The error message says that you''re calling a method on a nil object. > If you uncomment that line, you will be calling the student_id method > on @education_plan instance, but @education_plan is nil there. > > -- > Leonardo Mateo. > There''s no place like ~Thanks. Why is it nil if the method is part of the controller? And also how can I create an association between education_plan and student based on the ajax call from education_plan? -- Posted via http://www.ruby-forum.com/.
Misiek Sz wrote: [...]> > Thanks. Why is it nil if the method is part of the controller?Because you haven''t assigned a value to @education_plan ! This doesn''t happen automatically. Best, -- Marnen Laibow-Koser http://www.marnen.org marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org -- Posted via http://www.ruby-forum.com/.
On Sun, Oct 25, 2009 at 2:11 PM, Misiek Sz <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Leonardo Mateo wrote: >> On Sat, Oct 24, 2009 at 7:09 PM, Misiek Sz >> <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >>> made to the get_student_info method where student info is pulled and >>> �<tr> >>> � �<%= observe_field(:st_id, :frequency => 0.25, :update => >>> � �<td><%= f.label :service_code %></td> >>> >>> EducationPlan controller. >> The error message says that you''re calling a method on a nil object. >> If you uncomment that line, you will be calling the student_id method >> on @education_plan instance, but @education_plan is nil there. >> >> -- >> Leonardo Mateo. >> There''s no place like ~ > > Thanks. Why is it nil if the method is part of the controller?Which method is part of the controller? you are referencing an instance variable (@education_plan) which is not defined yet. The method in question, here, is student_id which is from the model (EducationPlan) but the object where you''re trying to call this method from is not of a EducationPlan instance, it is not even an instance, it is nil, and that''s why you get that error.> > And also how can I create an association between education_plan and > student based on the ajax call from education_plan? >I really don''t understand how you want to do the association here. The AJAX call behaves exactly as any other calls in the terms of the controller. If a Student has one EducationPlan, and you have: @student = Student.find(whatever) you should be able to do: @student.education_plan and @student.education_plan So, if you''re retrieving the student from the database, you''ll get the associated education plan. It looks like you have a misconception of the ActiveRecord associations, have you read the guide[1] for this? maybe it can help you to get it right. [1]http://guides.rubyonrails.org/association_basics.html Hope it helps.- -- Leonardo Mateo. There''s no place like ~
On Sun, Oct 25, 2009 at 2:33 PM, Marnen Laibow-Koser <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Misiek Sz wrote: > [...] >> >> Thanks. Why is it nil if the method is part of the controller? > > Because you haven''t assigned a value to @education_plan ! This doesn''t > happen automatically.Yes, this looks like another concept error on instance variables from Misiek -- Leonardo Mateo. There''s no place like ~
THank you for helping me out. So, I went through association guide, but still I can''t get it to work. My concept is this. Display a form to create a new EducationPLan. On the form have a text box and when the value is entered it doesn''t create an association yet, but returns student record(if found), which then is saved together with the form. Is this concept correct? I can render student info on the education_plan form fine, but is possible to have that information handled and have that 1-1 relationship saved when the form is submitted? -- Posted via http://www.ruby-forum.com/.
On Sun, Oct 25, 2009 at 3:23 PM, Misiek Sz <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > THank you for helping me out. So, I went through association guide, but > still I can''t get it to work. My concept is this. > Display a form to create a new EducationPLan. On the form have a text > box and when the value is entered it doesn''t create an association yet, > but returns student record(if found), which then is saved together with > the form. > Is this concept correct? > I can render student info on the education_plan form fine, but is > possible to have that information handled and have that 1-1 relationship > saved when the form is submitted?OK, now the situation is clearer for me. There''s something you''re not getting from associations, let''s see if with the example you get it more clear. If you want to create the association when you create the education plan, why would you try to get it on the get_info action and not on the create action? When you get (render) the student info on the create form for education plan, you should keep the student id and send it with the rest of the education plan parameters as the education_plan[student_id]. Then, in the create action, you can do EducationPlan.new(params[:education_plan]) (or whatever your params are called) and, if you have the right student_id the relationship should be created automatically. If it doesn''t work, you should "pastie" your code so we can debug it better. Hope it helps. -- Leonardo Mateo. There''s no place like ~
Leonardo Mateo wrote:> On Sun, Oct 25, 2009 at 3:23 PM, Misiek Sz > <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >> saved when the form is submitted? > OK, now the situation is clearer for me. There''s something you''re not > getting from associations, let''s see if with the example you get it > more clear. > If you want to create the association when you create the education > plan, why would you try to get it on the get_info action and not on > the create action? > When you get (render) the student info on the create form for > education plan, you should keep the student id and send it with the > rest of the education plan parameters as the > education_plan[student_id]. > Then, in the create action, you can do > EducationPlan.new(params[:education_plan]) (or whatever your params > are called) and, if you have the right student_id the relationship > should be created automatically. > > If it doesn''t work, you should "pastie" your code so we can debug it > better. > > Hope it helps. > > -- > Leonardo Mateo. > There''s no place like ~was on the road past two days..... I want to do exactly what you are saying Leonardo. Here is my code for education_plans_controller.rb ---------------------------- def create @education_plan = EducationPlan.new(params[:education_plan]) # this is my sneaky way around, which I don''t want to use....You''ll see what i''m doing when you see the view # @student = Student.find(params[:student_id]) # @tutor = Tutor.find(params[:tutor_id]) # @education_plan.student = @student # @education_plan.tutor = @tutor respond_to do |format| if @education_plan.save flash[:notice] = ''EducationPlan was successfully created.'' format.html { redirect_to(@education_plan) } format.xml { render :xml => @education_plan, :status => :created, :location => @education_plan } else format.html { render :action => "new" } format.xml { render :xml => @education_plan.errors, :status => :unprocessable_entity } end end end def new @education_plan = EducationPlan.new @education_plan.plan_details.build respond_to do |format| format.html # new.html.erb format.xml { render :xml => @education_plan } end end ---------------------------- education_plan - new view ---------------------------- <h1>New Education Plan</h1> <% form_for(@education_plan) do |f| %> <%= f.error_messages %> <div> Enter Student OSIS: <%=text_field_tag :osis %><%= image_tag ''loading.gif'', :id =>''loading'', :style => ''display: none''%> <div id="student_info"></div> </div> <table> <tr> <div> <table> <thead> <tr> <th></th><th>Code #</th><th>Start date</th><th>Evaluation/Measurement/Assesment</th> </tr> </thead> <tbody> <% 6.times do |i| %> <% f.fields_for :plan_details do |p| %> <%= render :partial => ''new_detail'', :object => p %> <% end %> <% end %> </tbody> </table> </div> <table> <tr> <td><%= f.label :comments %></td> <td><%= f.text_area(:comments, :cols => 30, :rows => 4) %></td> </tr> </table> <p> <%= f.submit ''Create''%> </p> <% end %> <%= link_to ''Back'', education_plans_path %> <%= observe_field(:osis, :frequency => 0.25, :update => :student_info, :url =>{:controller => ''students'', :action => :get_student_info}, :with => ''osis'', :before => "Element.show(''loading'')", :complete => "Element.hide(''loading'')") %> ---------------------------- students_controller.rb ---------------------------- def get_student_info @student = Student.find_by_osis(params[:osis]) if @student.nil? render :text => ''Couldn\'' find the student'' elsif !@student.education_plan.nil? render :text => ''Student already has an education plan.'' else render :partial => true, :action => ''show'' end end ---------------------------- students show view ---------------------------- <%=hidden_field_tag(:student_id, @student.id) %> <%=h @student.first_name + '' '' + @student.last_name %> ---------------------------- So, with my workaround it does what I want, but then all kinds of other problems are introduced i.e. error handling etc. I hope this illustrates better what I''m trying to do. Thanks! -- Posted via http://www.ruby-forum.com/.
On Thu, Oct 29, 2009 at 2:23 AM, Misiek Sz <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Leonardo Mateo wrote: >> On Sun, Oct 25, 2009 at 3:23 PM, Misiek Sz >> <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >>> saved when the form is submitted? >> OK, now the situation is clearer for me. There''s something you''re not >> getting from associations, let''s see if with the example you get it >> more clear. >> If you want to create the association when you create the education >> plan, why would you try to get it on the get_info action and not on >> the create action? >> When you get (render) the student info on the create form for >> education plan, you should keep the student id and send it with the >> rest of the education plan parameters as the >> education_plan[student_id]. >> Then, in the create action, you can do >> EducationPlan.new(params[:education_plan]) (or whatever your params >> are called) and, if you have the right student_id the relationship >> should be created automatically. >> >> If it doesn''t work, you should "pastie" your code so we can debug it >> better. >> >> Hope it helps. >> >> -- >> Leonardo Mateo. >> There''s no place like ~ > was on the road past two days..... > I want to do exactly what you are saying Leonardo. > Here is my code for > education_plans_controller.rb > ---------------------------- > def create > @education_plan = EducationPlan.new(params[:education_plan]) > # this is my sneaky way around, which I don''t want to use....You''ll see > what i''m doing when you see the viewI think that with this is enough.> # @student = Student.find(params[:student_id]) > # @tutor = Tutor.find(params[:tutor_id]) > # @education_plan.student = @student > # @education_plan.tutor = @tutorYou have you tutor_id and student_id parameters but you''re using them in the wrong way. You should send the parameters inside the params[:education_plan] array. You should receive, in the controller, params[:education_plan][:student_id] and params[:education_plan][:tutor_id] instead of params[:student_id] and params[:tutor_id]. So you need to modify your view to accomplish this. Once you have this, in your controller: @education_plans = EducationPlan.new(params[:education_plan]) will do all the magic with relationships. You don''t need to do @education_plan.student = Student.find(student_id) One more thing, if you''re testing, you can ensure that behavior in a test and then adjust you application. If you''re not testing... well.. you should. Hope it helps. -- Leonardo Mateo. There''s no place like ~
I totally get what you are saying. But in practice its not as easy. So when you say So you need to modify your view to accomplish this. You mean in my view of student information include a hidden field with name education_plan[student_id] or there is a way to set the params (in students for education_plans) without sending back the hidden field in the ajax render :partial? -- Posted via http://www.ruby-forum.com/.
I created clean new app to test and poke around. I got to work, but I
wonder if there is still a better way to handle it and someone could
point it our.
So i have two models:
class Project < ActiveRecord::Base
has_one :task
end
class Widget < ActiveRecord::Base
belongs_to :project
validates_presence_of :project
validates_associated :project
end
widget/new view
<h1>New widget</h1>
<% form_for(@widget) do |f| %>
<%= f.error_messages %>
<%= text_field_tag :wids %>
<p>
<%= f.label :name %><br />
<%= f.text_field :name %>
</p>
<p>
<%= f.label :wid %><br />
<%= f.text_field :wid %>
</p>
<p>
<div id=''disp''></div>
<%= observe_field ''wids'' ,:url => { :action =>
:find_project },
:frequency => 0.25,
:update => :disp,
:with => ''wids''
%>
<%= f.submit ''Create'' %>
</p>
<% end %>
<%= link_to ''Back'', widgets_path %>
widget controller
def find_project
@project = Project.find(params[:wids])
render :partial => ''find_project''
end
_find_project view
<p>
<b>Name:</b>
<%=h @project.name %>
</p>
<%= hidden_field_tag ''widget[project_id]'',@project.id %>
The piece that doesn''t sit well with me is the immediate line above as
its not dynamic. Meaning if I wanted to reuse find_project method in
ajax call from other controller than widgets then I havd hard code
hidden_field_tag name for that controller as well.
Is there a better way to handle this situation?
--
Posted via http://www.ruby-forum.com/.