I am returning to rails and hobby programming after several years away. I started a new project and I have run into an issue using drop down menus. I am positive it is a small mistake but I am having trouble finding an answer online.
I am making a database of Restaurants. I have a model setup called "meals" which has seeded data for breakfast, lunch, dinner. When creating a new restaurant entry, I want to be able to select from a drop down which meal category the restaurant serves which then saves the meal_id to the restaurant entry. I have meal belongs_to restaurant and restaurant has_one meal. I copied and pasted the below code into the restaurant's form.html.erb and after it didn't work I found more examples online and I do believe it should have worked but it keeps showing that it never saved that data.
<div
class="field">
<%= form.label "Meal" %>
<%= form.collection_select(:meal_id, Meal.all, :id, :meal, { :prompt => 'Select a Meal', :selected => #restaurant.meal_id }, { class: 'form-control' }) %>
Thanks for the help!
One issue:
This is the method, note the order of the variables:
collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})
So try this (if Restaurant is the object of the form):
form.collection_select(:restaurant, :meal_id, Meal.all.select(:name), :id, :name, { :prompt => 'Select a Meal' }, { class: 'form-control' })
Your real issue could be elsewhere, but without being able to see the whole form ERB or the controller code, I can only troubleshoot what I see.
Related
Im trying to setup a combobox with a no related model collection, it will be displayed in my Stand model new view, but they are not related directly.
It is like show the classic country -> state -> city relation form where country and city are not directly related, so what I want to do is just show a "country" combo when I am creating a new city to display just related states! PLS HELP! IM DYING DOING THIS!
I want to do something like this:
<div class="form-group">
<%
concat f.cr_ubicacion.select :codpabellon,
Mtopabellon.order(:nombre), :codpabellon, :nombre, {},
{class: "store-select"}
%>
</div>
Solved it!
<%
concat f.select :idubicacion, Mtopabellon.all.collect {|p| [
p.nombre, p.codpabellon ] }, {prompt: 'Seleccione una
pabellon'}, :class=>'form-control', :id => 'cmbPab'
%>
Just setup the collection I needed even using a different :idubicacion and it works!
I have monetised two models of my Rails 4 app with Money-Rails gem.
One is called Participants, the other is called Funding. Each of these models is nested inside another model, called Scope. Scope belongs to Project.
The associations are:
Project has one Scope; Scope belongs to Project
Scope has one Participant and has one funding; each of Participant and Funding belong to Scope.
Project accepts nested attributes for Scope. Scope accepts nested attributes for Participant and Funding.
Params for each relevant attribute in Participant and Funding are permitted in the Scope and Project Controllers as well as the models themselves. Params for Scope are permitted in the Scope and Project controllers.
In my Project form, I ask several questions. That form also has nested forms for each of the models which belong to it. Inside the Scope form, I ask users two boolean questions, being: Do you want participants? Do you want funding? Each of these models has a follow up question about participation cost and funding (those attributes are monetised).
If the answer to those questions is true, then I reveal the participant or funding form partial and ask how much money they want.
I have two problems:
First problem: Not null violation
1. If a user says they do want participants, but there is no associated costs, so that the boolean question inside the participant model asking whether there is cost involved with participation, I get an error that says:
ERROR: null value in column "participation_cost_pennies" violates not-null constraint
If a user says they don't want participants in answer to the question asked in the Scope form, I get the same error as in 1 above
Second problem: If I save an amount in the monetised fields, and come back to edit the project form, the form does not show the saved amount in the monetised field - and if you don't reenter it, I get an error saying that it can't be blank.
Does anyone know how to:
make the first problem go away in all circumstances except those when participation costs are actually sought; and
Fix the second problem by displaying the original amount saved when you come back to edit the form? I have tried inserting :selected into my form element, but it doesn't do anything.
My code is as follows:
Inside my Scope form (nested inside my project form):
<%= f.simple_fields_for :scope do |s_all| %>
<%= s_all.input :if_participant, :as => :boolean, :label => false, inline_label: 'Public participants or volunteers' %>
<%= s_all.input :if_funding, :as => :boolean, :label => false, inline_label: 'Funding or expenses' %>
If the answer to these fields is true, then I reveal the partial forms for participant of funding (for whichever is true).
Inside my Participants partial form, I have:
<%= f.simple_fields_for :scope do |participants_s| %>
<%= participants_s.simple_fields_for :participant do |par| %>
<%= f.label 'Are participants reimbursed for their costs?', :class => 'question-project' %>
<%= par.collection_radio_buttons :costs, [[true, ' Yes'], [false, ' No']], :first, :last, {:item_wrapper_class => 'fixradio'}, {:class => "response-project"} %>
<%= f.label 'What amount will you pay for participation costs?', :class => 'question-project' %>
<%= par.select :participation_cost_currency,
options_for_select(major_currencies(Money::Currency.table)), selected: :participation_cost_currency,
label: false,
prompt: "Select your costs currency" %>
<%= par.input :participation_cost, label: false, placeholder: 'Whole numbers only', selected: :participation_cost_pennies, :input_html => {:style => 'width: 250px; margin-top: 20px', class: 'response-project'} %>
For the first problem, you'll want to set a default value for the participation_cost_cents column in a migration:
# in console
> rails g migration change_default_for_participation_cost_cents
# in migration file
class ChangeDefaultForParticipationCostCents < ActiveRecord::Migration
def change
change_column :participants, :participation_cost_cents, :integer, default: 0
end
end
I'm not sure I follow on the second problem though. Maybe you should split the question in two?
A meetup group for Rails has helped me answer this question. The answer is not obvious - especially for newcomers.
My problem was I had an attribute in my database called participation_cost. Monetise then tried to make a method with the same name and that was failing because of the attribute in my table. For others, you don't need the attribute in your database with the name of the field you want to monetise.
Removing that attribute (in my case, participation_cost) solved my problem.
My problem is that I have, for example, Product, Category and ProductCategory.
ProductCategory makes possible for a Product have several Categories
I would like to implement this using Select2 (http://ivaynberg.github.io/select2/) using the select2-rails gem (https://github.com/argerim/select2-rails)
I already know how to relate the models but I can't figure out how to implement the Select2 specific code.
EDIT:
Now I see that my problem was not much about select2, so I added this comment and changed the title hoping that it can help somebody else
Now I see that my problems were not about select2 but to do a multi select.
The code in the _form.html.erb that make it work is this one:
<%= f.label :category_id %>
<%= f.collection_select :category_ids, Category.order(:name), :id, :name, {:selected => #product.category_ids, :include_blank => true}, {:class => 'col-xs-12 col-md-7 padding_15', :multiple => true} %>
I also included :category_ids in the attr_accessible on models/product.rb
And the select2 specific, I included in a .js file
$(document).ready(function() {
$('#product_category_ids').select2();
});
I'm including these links as they helped me but pay attention on the differences depending on the Ruby/Rails versions
http://www.dzone.com/snippets/using-mutiple-collection
http://www.alethe.com/brad/2009/10/multiple-select-list-in-rails/
Just to let you know, unexpectedly, if this collection_select is the last line in my form, some form fields are disabled although there is nothing that states this in the source. Changing the order this problem doesn't exist.
I also don't know why the look is a little different than the other fields (I'm using Bootstrap 3)
I have checked some tutorials but I got confused by the parameters in this method
collection_select (object, attribute, collection, value_method, text_method, options = {}, html_options ={})
I have a map model includes: :area, :system, :file
and I want to read :area from database to a drop down list, and let user choose one
I already did #map = Map.all in the view
what the method should be?
especially the parameter "attribute". In a lot tutorials, people put "id" here. But I don't know what "id" is, and in my situation I don't need any other value, just the "area".
Im not exactly sure what you are asking here but if you are trying to make a dropdown selection for use in an html form will this example help you at all?
<% nations = {'United States of America' => 'USA', 'Canada' => 'Canada', 'Mexico' => 'Mexico', 'United Kingdom'=> 'UK'} %>
<% list = nations.sort %>
<%= f.select :country, list, %>
Here nations is a hash of countries then list becomes the sorted copy of that hash. An html dropdown is then created as a part of the form "f". ":country" is the part of the model that the data is connected to while list is the options to populate the dropdown with
It's not clear from your question what the model is that's being populated with the area.
Typically, collection_select is used between related models.
eg.
class Category < ActiveRecord::Base
has_many :products
end
class Product < ActiveRecord::Base
belongs_to :category
end
When selecting the 'category' for a product, your view would have something like:
<%= f.collection_select(:category_id, :id, Category.all, :name, include_blank: true) %>
What this does is specify the Product.category_id as the attribute being populated with the value of Category.id. The values come from the Category.all collection, and with Category.name being the item displayed in the select. The last (optional) parameter says to include a blank entry.
Something like the following is probably what you need:
<%= f.collection_select(:map_id, :id, #map, :area) %>
However, if the model you're trying to populate has an area attribute (instead of an ID linking to the map), you might need to use:
<%= f.collection_select(:area, :area, #map, :area) %>
This specifies that the area attribute of the receiving table will be populated with Map's area attribute, which is also being used as the "description" in the select.
How can I create a select box that has the following given 4 results for User.departments:
Department.title (Department.abbreviation)
Department.title (Department.abbreviation)
Department.title (Department.abbreviation)
Department.title (Department.abbreviation)
-----
Add New Department
Based on the following models:
User.department_id
Departments (id, title, abbreviation)
What I can't figure out is how add the two options at the bottom that say Add New Department.
Here is what I have so far:
<%= collection_select(:user, :department_id, Department.where(:id => current_user.department_id), :id, :title, {:prompt => true}) %>
Thanks
Your best bet is to use select instead of collection_select for this, here is an example of how I would do it.
<%= f.select(:user, Department.where(:id => current_user.department_id).collect {|p| [[p.title,' (', p.abbreviation,')'], p.id] } + ['Add New Department']) %>
Then you could use something like javascript to do something when 'Add New Department' got selected or however you planned on using it.
Hope this helps and happy coding.