I'm building a simple form to let users of my rails 4 site message each other.
In the form, the user can select the recipient of the message with a select list of all the users in the system (it's a small user base).
Right now the form control looks like this, and works fine:
<%= f.select(:to_id, options_from_collection_for_select(User.all, :id, :first_name), {}, {:class => 'form-control'}) %>
However, there's a "nickname" field in the Users table as well-- I'd like to have the form show the nickname (if it exists) as well as the user's first / last name-- so the value of the select would be:
<option>Snoop Dogg - Calvin Broadus</option>
rather than just
<option>Calvin</option>
Is this possible?
Make a display_name on the Users model
def display_name
nickname || first_name
end
Then update your form to reference it
<%= f.select(:to_id, options_from_collection_for_select(User.all, :id, :display_name), {}, {:class => 'form-control'}) %>
Related
I have a dropdown menu:
<%= f.collection_select :price, Print.all, :printprice, :sizetotal, {prompt: "Pick A Size & Medium"} %>
It currently populates the :price database column with the value :printprice, and shows the value :sizetotal in the actual dropdown selection.
I want to be able to populate two database columns, one of which is the :price column which is already working, but I also want to populate another column called :size with the value :printsize. I want to do this using the same dropdown select menu.
Something like:
<%= f.collection_select :price, :size, Print.all, :printprice, :printsize, :sizetotal, {prompt: "Pick A Size & Medium"} %>
But obviously the above doesnt work
Is this possible?
Following my comment, here is the ID alternative. Basically you want to send only the ID of the print, and find again the whole object on the backend during the #create or #update actions
print_for_size_and_price = Print.find(params[:print_id_for_size_and_price])
So on the frontend I'd use something like this
select_tag(
:print_id_for_size_and_price,
options_from_collection_for_select(Print.all, :id, :sizetotal)
)
And in the backend I'd do somewhere
my_instance.price = print_for_size_and_price.printprice
my_instance.size = print_for_size_and_price.sizetotal
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.
I am trying to use a form_for collection_select to display some select field options of account types.
Its occurred to me that it would be easier for the user if they could see the price of the type in each select option
this is my currently not-working code:
<%= a.collection_select :account_type, AccountType.all, :id, (:name+" - "+number_to_currency(:price)) %>
how can i concatenate the values so that (:name+" - "+number_to_currency(:price)) will actually work and not throw an error?
See the documentation:
http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-collection_select
You can use the :text_method option to set the displayed text in the select dropdown.
In your AccountType model, define a method like this:
def name_with_price
"#{name} - $#{price}"
end
Then, in your view, you can use:
<%= a.collection_select :account_type, nil, AccountType.all, :id, :name_with_price %>
I have form for adding a new job. On my form I have a select drop-down list. I need to associate the new job to a customer. The following works great.
<%= f.collection_select :customer_id, Customer.all, :id, :business_name %>
But, what if I want to also be able to send in a customer_id to the new form? Can I have the form's select drop-down show all the possible customers, as above, but have it auto select the customer_id I pass into the form, if a customer_id is passed in?
url = ...jobs/new
OR
url = ...jobs/new?customer_id=5
I apologize if I did not explain this well enough.
Thanks in advance.
--jc
I think you do what you're trying to achieve this by populating the customer_id field on the job you're creating in your controller if customer_id is present in the request params. This should make that particular customer be the initially selected option in the form.
http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-collection_select
e.g. Something like.
if params[:customer_id].present?
job.customer_id = params[:customer_id]
end
If you declaring the instance variable #customer in your controller action then you can use selected option as:
<%= f.collection_select :customer_id, Customer.all, :id, :business_name, {:selected => #customer.id} %>
With the code I have below in the select field I have all the public_campaigns:
<%= f.select :campaign_id, #public_campaigns.map{|x| [x.name,x.id]} %>
public_campaigns is defined in controller with:
#public_campaigns = #logged_in_user.campaigns.order('created_at desc')
In the form I select the campaign and fill up the rest of the form and at the submit action an invitation is created with campaign_id taken from the campaign I selected in the form, it can be anything from 1 to n
What I need now is to have a default item in select field that will have the value of 0 and named "No campaign", it means I invite someone to a campaign that I have not created yet and in invitation the campaign_id field will be 0.
Thank you for your time.
Do you really need 0? I think use of {:include_blank => "No campaign"} should be enough?
Try this:
<%= f.select :campaign_id, (#public_campaigns.map{|x| [x.name,x.id]} << ["No campaign",0]), {:selected => 0} %>
Well, the fastest way you can do this is something like this:
#public_campaigns = #logged_in_user.campaigns.order('created_at desc')
no_campaign = Campaign.new(:id => '0', :name => 'No Campaign')
#public_campaigns.unshift(no_campaign)
I'm not sure why you are unable to do it this way:
<%= f.collection_select :campaign_id, #public_campaigns, :id, :name, prompt: 'No campaign' %>
Just check if campaign_id.nil? instead of assigning any value to campaign_id