<%= form_for(:offer,:url=>{:controller=>'offers',:action=>'combo'}) do |f|%>
<%= f.select :catId_get, options_from_collection_for_select(#categories, "id", "name"), prompt: "Select Category" %>
I am new in rails.I have a dropdown where all categories are there.When i select a category from this dropdown i want to get its category id in my controller,so that i can use that id for it's child dropdown.
Select
Each select option in HTML has two values -- the value and the label:
<select>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
It's only the value which is passed to your controller. This means if you are able to create the select tag in your Rails app with the correct value / label setup, it will pass the correct data you require.
Rails
Here's how I'd handle it:
<%= form_for :offer, offers_combo_path do |f|%>
<%= f.collection_select :cat_id, #categories, :id, :name, prompt: "Select Category" %>
This will pass the following params to your categories_controller:
#app/controllers/categories_controller.rb
class CategoriesController < ApplicationController
def combo
params[:offer][:cat_id]
end
end
Recommendation
I'd actually recommend you use the form_tag helper for this, rather than form_for. Reason being that form_for is mainly for ActiveRecord objects, and although you can use :symbols in the helper, you will really need to use a much less elaborate system
I'd just replace your form_for with the following:
<%= form_tag offer_combo_path do %>
<%= collection_select :cat_id, #categories, :id, :name, prompt: "Select Category" %>
<% end %>
Your id should be accessible by
params[:offer][:catId_get]
in your controller.
Related
I have a form without a model backing it built using form_with in Rails 6:
<%= f.text_field :one %>
<%= f.select :two, [['Option 1',1],['Option 2',2]] %>
<%= f.submit 'Submit' %>
The only documentation I can find to set which of the select options are selected by default says that it will pre-select whatever is in the model. Since I don't have a backing model, how can I choose which option is selected? I've poked around the options a little and found nothing, but I do not necessarily know where to look.
You must have missed it, there's an optional selected keyword argument.
Lastly, we can specify a default choice for the select box with the
:selected argument:
<%= form.select :city, [["Berlin", "BE"], ["Chicago", "CHI"], ["Madrid", "MD"]], selected: "CHI" %>
Output:
<select name="city" id="city">
<option value="BE">Berlin</option>
<option value="CHI" selected="selected">Chicago</option>
<option value="MD">Madrid</option>
</select>
https://guides.rubyonrails.org/form_helpers.html#making-select-boxes-with-ease
How to dispaly selected value in edit page.
in my form i need to display selected value. it is not selecting the value which i selected and submitted. else it shows "please select Study material".
This is my StudyMaterial model
class StudyMaterial < ActiveRecord::Base
TYPES = ['Question Paper', 'Book', 'Audio', 'Video']
enum study_material_type: TYPES
end
This is my 'form.html.erb'
<select class=" required form-control" name="study_material[study_material_type]" id="study_material_study_material_type" data-validation="required" data-validation-error-msg="Select study material">
<option value="">Please select study material</option>
<option value="Question Paper">Question Paper</option>
<option value="Book">Book</option>
<option value="Audio">Audio</option>
<option value="Video">Video</option>
</select>
How to dispaly selected value in edit page.
I am getting this error when i click edit studymaterial page
Please help me to solve this error
<%= form_for #study_material do |f| %>
<%= f.select :study_material_type, StudyMaterial::TYPES.map{|v| [v,v]}, selected: f.object.try(:study_material_type) , required: true, include_blank: "Select" %>
<% end %>
I think, you look something like that:-
<%= form_for #study_material do |f| %>
<%= f.select :study_material_type, StudyMaterial::TYPES, include_blank: "Please select study material", required: true %>
<% end %>
It will display selected value.
I am a newbie to Ruby on Rails and am stumped. As part of my exercise I am creating an app that let's people put in their goal, a description, a deadline and assign it to a person.
I've got two models, a user model and a goal model. In my ERB form to create a new goal, I've created a dropdown menu of all the created users but now I have no idea how to convert that into the foreign key that gets saved.
<%= form_for(#goal) do |f| %>
<% if #goal.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#goal.errors.count, "error") %> prohibited this goal from being saved:</h2>
......
<div class="field">
<%= f.label :user_id, "Whose goal is it?" %><br>
<%= collection_select(:goals, :user_id, User.all, :id, :name, prompt: true ) %>
</div>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
The above seems to create the dropdown menu I need. I just have no idea how to get from the :name generated in the dropdown to the :user_id associated with it to submit.
Will greatly appreciate your help.
Thanks!
Frist you should use singular as object in collection_select:
<%= collection_select(:goal, :user_id, User.all, :id, :name, prompt: true ) %>
Then your collection_select creates a select tag with name goal[user_id]. It will look like
<select name="goal[user_id]">
<option value="">Please select</option>
<option value="1" selected="selected">D. Heinemeier Hansson</option>
<option value="2">D. Thomas</option>
<option value="3">M. Clark</option>
</select>
The options have user IDs as value an the names as content. So the parameter
params[:goal][:user_id]
contains the ID of the selected user. This is exactly how Rails expects the foreign key.
See the documentation of collection_select
Adition: there are great gems to simplify form generation, i.e. simple_form which reduces your form to
<%= simple_form_for(#goal) do |f| %>
...
<%= f.association :user %>
<% end %>
Your question is already answered but I'd like to share an awesome tutorial I found:
Advanced forms
Just add to your 'new' controller
#user_options = User.all.map{|u| [ u.name, u.id ] }
Then in your form:
<%= f.select(:user_id, #user_options) %>
I have two models (code redacted for clarity):
class App < ActiveRecord::Base
has_and_belongs_to_many :products
end
class Product < ActiveRecord::Base
has_and_belongs_to_many :apps
end
I want to be able to add multiple products to each app. Also, the order of the products in the app is important, and where I'm having trouble.
I'm using simple_form and I've tried using the association method:
<%= simple_form_for(#app) do |form| %>
<%= form.input :name %>
<%= form.association :products %>
<%= form.button :submit %>
<% end %>
It works wonderfully, but the select box it creates is not orderable. My attempt at a solution was to create multiple <select> boxes and order them somehow. This so far isn't working. As a test I tried this:
<%= form.collection_select('product_ids', Product.all, :id, :name, {}, {name: 'app[product_ids][]'}) %>
<%= form.collection_select('product_ids', Product.all, :id, :name, {}, {name: 'app[product_ids][]'}) %>
<%= form.collection_select('product_ids', Product.all, :id, :name, {}, {name: 'app[product_ids][]'}) %>
<%= form.collection_select('product_ids', Product.all, :id, :name, {}, {name: 'app[product_ids][]'}) %>
It actually does make the association in the database, but it 'selects' all the products for each select tag which ends up just selecting the last product on all of them:
<select id="app_product_ids" name="app[product_ids][]">
<option selected="selected" value="1">Golf Club</option>
<option value="20">Music Disc</option>
<option selected="selected" value="17">Magic Wand</option>
<option value="15">Nike Running Shoes</option>
<option selected="selected" value="19">Watch</option>
<option selected="selected" value="16">Wooden Spoon</option> // this is what is selected in the browser
</select>
Eventually, I'll make the adding and removal of these dynamic.
So my question is, how can I make this work? One way would be to have each <select> associate to the particular product instead of all the products. Maybe there's a better way all together.
i have a select that take values from database.
<%= select_tag :location, options_from_collection_for_select(Country.all, :id, :country_name), { :class => 'selectpicker' } %>
So i get all countries from database.
How i can do for add a custom value(for example Any, with value 0), to this select list taken from database ?
For example now i have:
<select>
<option value="UK">UK</option>
</select>
and i want get this:
<select>
<option value="0">Any</option>
<option value="UK">UK</option>
</select>
Thanks.
You can use the either prompt or include_blank options (FormOptionsHelper) as follows:
<%= select_tag :location, options_from_collection_for_select(Country.all, :id, :country_name), :prompt => 'Any', :class => 'selectpicker' %>