I have the following code in my rails app:
<%= select :object,
:id,
options_for_select(Hash[#object_list.map { |object| [object.name, object.id] }]),
{:include_blank => 'Please select...'},
{} %>
If no option is selected then in my controller I receive an empty string.
How can I make the options for select send 'nil' value instead?
I think you can achieve that by inserting nil in your list.
<%= select :object,
:id,
options_for_select(Hash[#object_list.map { |object| [object.name, object.id] }].merge({:0 => nil}), selected: 0) %>
You should use before_action callback for your controller.
class SomeController
before_action :prepare_params
private
def prepare_params
params[:your_param] = nil if params[:your_param].blank?
end
end
Related
I have private method on controller
private
def set_address
#address = Address.find(params[:id])
end
def city_options
#city_options = []
if #address
#city_options = City.where(province_id: #address.province_id).collect{ |x| [x.name, x.id] }
end
end
And on views of _form.html.erb
<%= f.select :city_id, #city_options, { :prompt => I18n.t('prompt.select_city') }, class: 'select-city text address-city' %>
It's fine on new form and edit has right selected value, but when I encrypt the id in city_options method
#city_options = City.where(province_id: #address.province_id).collect{ |x| [x.name, encrypted_id(x.id)] }
List of city is shown and value of id is encrypted but wrong selected a value of city, just selected id on top of list.
Wrong value is selected because the saved city_id do not match the encrypted_id of any select list option.
To get over it you can use options_for_select method. Try following if encrypted_id method is a helper method
<%= f.select :city_id, options_for_select(#city_options, selected: encrypted_id(f.object.city_id)), { :prompt => I18n.t('prompt.select_city') }, class: 'select-city text address-city' %>
Check this link http://apidock.com/rails/v3.1.0/ActionView/Helpers/FormOptionsHelper/options_for_select
If encrypted_id method is a controller method, you have pass currently selected value by encrypting it from controller. Or you can use
helper_method :encrypted_id in controller to make encrypted_id method available in view and can use above mentioned method
I have edited my first code and now it's better and cleaner thanks to #FunTimeFreddie, but the issue it's not yet properly solved. I'll come back with the right answer sooner.
In a search form I need to filter all menuitems:
1. per category
2. per category and search “query”
3. per min price && || max price
… and so on, with all possible combinations
I’ve manage to make a search in all menuitems with a “query”, min_price and max_price --all possible combinations from the search form. I can NOT manage to have the list of results of the chosen category, what am I doing wrong?
This is my model(edited):
class Menuitem < ActiveRecord::Base
belongs_to :menu_category
include Filterable
scope :newest_first, lambda { order('menuitems.created_at DESC') }
scope :last_one, lambda { order('menuitems.created_at ASC').last }
scope :search_keyword, lambda { |query|
where(["title LIKE ? or body LIKE ?", "%#{query}%", "%#{query}%"]) if query != ""
}
scope :menu_category_id, lambda { |menu_category_id|
where( "menu_category_id = ?", menu_category_id ) if menu_category_id != ""
}
scope :min_price, lambda { |price|
where("price > ?", price) if price != ""
}
scope :max_price, lambda { |price|
where("price < ?", price) if price != ""
}
end
This is my controller(edited):
class MenuitemsController < ApplicationController
def index
#menuitems = Menuitem.newest_first.filter(params.slice(:menu_category_id, :search_keyword, :min_price, :max_price))
end
And this is my view:
<%= simple_form_for :menuitem, :method => 'get', :url => {:action => 'index'} do |f| %>
<p>
<%= f.select :menu_category_id, options_for_select(#menucategories.map {|s| [s.title, s.id]}, params[:menu_category_id]), :selected => params[:menu_category_id], :onchange => "this.form.submit();", prompt: "Select category" %>
</p>
<p>
<%= f.input :search_keyword, input_html: { name: 'search_keyword', :value => params[:search_keyword]}, label: 'search recipe title', :required => false %>
<%= f.input :min_price, input_html: { name: 'min_price', :value => params[:min_price]}, label: 'min price:', :required => false %>
<%= f.input :max_price, input_html: { name: 'max_price', :value => params[:max_price]}, label: 'max price:', :required => false %>
<%= f.button :submit, "search" %>
</p>
<% end %>
You can save yourself the trouble of all the IF statements in your controller for all of the combinations by adding an IF statement within the scopes. For example, and this can similarly be applied to the four scopes associated to your form,
# menuitem model
scope :search_keyword, lambda { |query|
where(["name LIKE ?", "%#{query}%"]) if query != ""
}
This will allow to include only a single line in your controller, the line beneath your first IF statement, as this will handle the blank parameters.
There seems to be two issues with the category parameter. The first is it is a nested parameter within params[:menuitem], so in order to access it we need to call params[:menuitem][:menu_category_id]. Not too sure why this is happening to be honest, though I would recommend in this instance using a form_tag as opposed to form_for, given that we are not adding or editing the menuitems table itself.
The second issue is the category parameter is passed as a string, whereas we need it as an integer. We'll need to convert to parameter before applying it.
Now I'm not familiar with the .filters method (is this part of a gem?) but I got this to work the old fashioned way just by concatenating all the scopes together in one line as follows...
# menuitems controller
def index
#menuitems = Menuitem.newest_first.min_price(params[:min_price]).max_price(params[:max_price]).search_keyword(params[:search_keyword]).menu_category_id(params[:menuitem][:menu_category_id].to_i)
end
Note, another way of changing the data type would be to do so in the scope. You could do this as follows
# menuitem model
scope :menu_category_id, lambda { |menu_category_id|
where( "menu_category_id = ?", menu_category_id.to_i ) if menu_category_id != ""
}
Im trying to implement a multiple level drop down list in Rails
I have three Tables in my DB.
vehicle_make.rb
class VehicleMake < ActiveRecord::Base
validates_uniqueness_of :make
has_many :appointments
end
vehicle_model.rb
class VehicleModel < ActiveRecord::Base
validates_uniqueness_of :model
has_many :appointments
end
vehicle_make_model.rb
class VehicleMakeModel < ActiveRecord::Base
validates_uniqueness_of :vehicle_make_id, :scope => :vehicle_model_id
end
and im trying to implement a multiple dropdown list in appointments.html.rb
on selecting the vehicle model only corresponding make should load..
<%= f.select :vehicle_make_id, options_for_select(vehicle_make.map {|s| [s.make, s.id]}, appointment.vehicle_make_id), {}, {class: "form-control"} %>
and in my js i have..
$('#appointment_vehicle_make_id').on('change', function() {
var vehicle_make_id = this.value;
$.ajax({
url : '/appointments/update_models',
type : 'GET',
data : {
make_id : vehicle_make_id
},
success : function(response) {
console.log(response);
}
});
});
and this is my controller method.
def update_models
#vehicle_models = VehicleModel.all
#model_ids = []
#selected_vehicle_models = VehicleMakeModel.where(vehicle_make_id: params[:make_id]).order(:vehicle_model_id) unless params[:make_id].blank?
#selected_vehicle_models.each do |t|
#model_ids << t.vehicle_model_id
end
respond_to do |format|
format.html { render layout: false }
format.js
end
end
I have html page named update_models.html.erb associated to the above action.
<%= select_tag :vehicle_model_id, options_for_select(#model_ids.map {|s| [s.model, s.first.id]}, nil), {}, {class: "form-control"} %>
I get an error in terminal saying
ActionView::Template::Error (wrong number of arguments (4 for 1..3)):
1: <%= select_tag :vehicle_model_id, options_for_select(#model_ids.map {|s| [s.model, s.first.id]}, nil), {}, {class: "form-control"} %>
Im stuck here. I dont know how to proceed from here.. please help
In your controller action update_models, you are trying to render js, so it's trying to find template named as update_models.js.erb.
You can try replacing your respond_to block with:
respond_to do |format|
format.json { render :json => #model_ids }
end
Afterwards, you will need to parse this data in your ajax success callback
<%= collection_select(:catgory, :id, #categories, :id, :title, {}, data: { behavior: 'category_dropdown' }) %>
In the above code I need to pass a parameter to the title method. Is there any way to do this with collection_select?
<%= collection_select(:catgory, :id, #categories, :id, (:title, #program), {}, data: { behavior: 'category_dropdown' }) %>
Edit:
Looking at the internals for collection_select the text_method. It is eventually passed to a .send method which should allow for element.send(:title, #program). However, I think the issue why I still can't pass the param is that collection select is reading (:title, #program) as two params instead of one.
Use select instead:
select "catgory", "id", #categories.map{|c| [c.title(#program), c.id]}, {}, data: { behavior: 'category_dropdown' }
Should be working.
This can be done with collection_select if your model has an existing parameter you can overwrite:
f.collection_select( :your_model_id,
YourModel.all.map{|ym| ym.name = ym.custom_name(your_parameter); ym},
:id, :name,
{:selected => #model_instance.logic},
{:class => 'your class', :other => "..." } )
For instance I do this to conditionally pluralize my model's name attribute
class MyModel < ActiveRecord::Base
DEFAULT_NAME_COUNT = 99
def pluralized_name(n = DEFAULT_NAME_COUNT)
begin
return name.pluralize(n)
rescue
end
name
end
end
I have the following problem. I have a form which takes input for a "Chart" object. But after processing the form, i wish to display one of the values, and it adds the key of this value.
Class model
class Chart
attr_accessor :title, :series
def initialize(title = nil, series = [])
#title, #series = title, series
end
end
View of form:
<% form_for :chart , :url => { :action => "show" } do |f| %>
<p>
<%= f.label :title %><br />
<%= f.text_field :title %>
</p>...
<% end %>
Chart controller, show method:
def show
#chart = Chart.new(params[:chart])
end
View of show:
<h2><%=h #chart.title %></h2>
Which displays: "title"input_forms_title""
for example: writing in the input form: Economy, prints in the show view: "titleEconomy"
Any ideas?
I have just figured it out. The problem was in the constructor or initialize method. By changing the initialize method to:
def initialize( options = {} )
#title = options[:title]
#series = []
end
It now accepts all params perfectly!