[Rails] Filtering records using a control Justin Holzer Fri, 31 Oct 2008 01:24:09 -0700 I have recently been working on a simple list action and view that will allow a user to filter the objects that are selected by changing a category value in a <select> control. In this case, the resources being listed are restaurants. The view also contains a list of all restaurant categories, which defaults to a selection of "All Categories", that will allow them to filter the restaurants displayed by category. I have a working implementation, however, it feels like a bit of a hack. In the view, I am using the form_for and collection_select helpers, because they handle auto-selecting the appropriate value and don't require me to assemble an options hash. The part that feels like a hack to me is that in order to get the auto-selection to work, I am creating a Category model object in the controller, and assigning the id value that was submitted through the form as the object's "id" property. Also, I have to explicitly set the "name" property in the htmlOptions hash, so that the field gets submitted as params[:category_id] rather than params[:category_id]. I am new to Rails, and I wanted to see if anyone felt there was a cleaner way for me to implement this functionality. Anyhow, here's the code. Any suggestions would be greatly appreciated: #** Controller **# def index (@category = Category.new()).id = params[:category_id] if ([EMAIL PROTECTED]) @restaurants = Restaurant.find_all_by_category_id(@category.id) else @restaurants = Restaurant.find(:all) end respond_to do |format| format.html { @categories = Category.find(:all) } # index.html.erb format.xml { render :xml => @restaurants } end end #** View (index.rhtml) **# <% form_for( :category, :html => {:method => :get}) do |f| %> <%= f.collection_select( :id, @categories, :id, :name, {:include_blank => 'All Categories'}, {:onchange => 'this.form.submit();', :name => 'category_id'} ) %> <% end %> Lastly, I was wondering if it would it make more sense to move the category selection form to a partial, rather than embed it directly in index.rhtml with these rest of the code (which is not shown above)? Thanks for the help, Justin Holzer --~--~---------~--~----~------------~-------~--~----~ 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@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~--- Previous message View by thread View by date Next message [Rails] Filtering records using a <select> contr... Justin Holzer [Rails] Re: Filtering records using a <select&... Mark Reginald James Reply via email to

[Justin Holzer]

I have recently been working on a simple list action and view that
will allow a user to filter the objects that are selected by changing
a category value in a <select> control.

In this case, the resources being listed are restaurants. The view
also contains a list of all restaurant categories, which defaults to a
selection of "All Categories", that will allow them to filter the
restaurants displayed by category.

I have a working implementation, however, it feels like a bit of a
hack. In the view, I am using the form_for and collection_select
helpers, because they handle auto-selecting the appropriate value and
don't require me to assemble an options hash. The part that feels like
a hack to me is that in order to get the auto-selection to work, I am
creating a Category model object in the controller, and assigning the
id value that was submitted through the form as the object's "id"
property. Also, I have to explicitly set the "name" property in the
htmlOptions hash, so that the field gets submitted as
params[:category_id] rather than params[:category_id].

I am new to Rails, and I wanted to see if anyone felt there was a
cleaner way for me to implement this functionality. Anyhow, here's the
code. Any suggestions would be greatly appreciated:

#** Controller **#
def index
    (@category = Category.new()).id = params[:category_id]

    if ([EMAIL PROTECTED])
      @restaurants = Restaurant.find_all_by_category_id(@category.id)
    else
      @restaurants = Restaurant.find(:all)
    end

    respond_to do |format|
      format.html { @categories = Category.find(:all) } #
index.html.erb
      format.xml  { render :xml => @restaurants }
    end
end

#** View (index.rhtml) **#
<% form_for( :category, :html => {:method => :get}) do |f| %>
    <%=
        f.collection_select(
            :id,
            @categories,
            :id,
            :name,
            {:include_blank => 'All Categories'},
            {:onchange => 'this.form.submit();', :name =>
'category_id'}
        )
    %>
<% end %>


Lastly, I was wondering if it would it make more sense to move the
category selection form to a partial, rather than embed it directly in
index.rhtml with these rest of the code (which is not shown above)?

Thanks for the help,

Justin Holzer

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