Select_tag wont dispay anything - ruby-on-rails-4

I have the following code
<%= form_tag('/update', method: :post) do %>
<%= select_tag :role, UserSomething.roles.keys.map {|role| [role.titleize,role]} %>
Role is an enum which text values have to be displayed in the drop down menu, and on form submit, i have to send the index of selected enum to some controller. I don't know how to set select_tag propertly.

I would use the helper options_for_select to map the array you get from UserSomething.roles.keys.map to a list of options for the select. I don't think out the select_tag method handles an array of the box, it needs a list of option tags. See the docs here.
<%= form_tag('/update', method: :post) do %>
<%= select_tag :role, options_for_select(UserSomething.roles.keys.map {|role| [role.titleize,role]}) %>
<% end %>

Related

Rails: Conditional nested attributes in edit form

I have a model called Offer and another called PurchasinGroup
Offer has many PurchasingGroups
Offer accepts nested attributes for PurchasingGroups
While creating an offer you can add as many PurchasingGroups as you want.
PurchasingGroup has a boolean attribute called active.
while editing an Offer you can see all the created PurchasingGroups, however I want to let the user edit only the PurchasingGroups that are active, and do not display the inactive purchasing groups.
This is my edit action in offers_controller.rb:
def edit
#offer = Offer.find(params[:id])
end
And this is my form (only the part that matters):
<fieldset>
<legend>Purchasing groups</legend>
<%= f.fields_for :purchasing_groups do |builder| %>
<%= render partial: 'purchasing_group_fields', locals: { f: builder } %>
<% end %>
</fieldset>
In the edit form all the purchasing groups are being shown for edit, I want to show only those that are active I mean purchasing_group.active == true
How is the best way to do it?
<%= f.fields_for :purchasing_groups, #offer.purchasing_groups.where(active: true) do |builder| %>
<%= render partial: 'purchasing_group_fields', locals: { f: builder } %>
<% end %>
on the other hand, you can also add a association in your model
class Offer
has_many :active_purchasing_groups, class_name: "PurchasinGroup", -> { where(active:true) }
...
end
and then
<%= f.fields_for :active_purchasing_groups do |builder| %>
<%= render partial: 'purchasing_group_fields', locals: { f: builder } %>
<% end %>

RoR: How to set the value in a collection_select from the database in the edit view (1:many relation)

I am at the moment creating a complicated rails form for 1:n relationship with nested form and collection select with values from yet another data table.
So far, it overwrites the database value with the first entry in the values list of the collection_select whenever the user does not select the correct value before update. I still need to set the initial value in the collection_select correctly.
I have read a lot of questions on SO already, most relevant was:
f-collection-select-not-displaying-the-selected-value
The only thing still missing (I hope!), is the setting of the value of the form field from the database, so it does not get overwritten with a default value from the selects selectable values, even though the user has not touched the select.
This snippet is derived from my code and the solution to the abovementioned question and is wrong.
Let a person have many things and validthings contains the possible values for things:
In the things table there will only be Thing strings, that are also in the validthings table. It is possible to give the collection_select selected param a string from the things table that can be identified in the list of values from the validthings table.
<div class="col-md-12">
<%= form_for(#person) do |f| %>
<%= f.fields_for :things do |d| %>
<%= d.hidden_field :id %><%= d.hidden_field :person_id %>
<%= d.collection_select(:Thing, Validthings.all, :Thing, :Thing, {:selected => #person.things.map(&:id).Thing.to_s} ) %>
<% end %>
<% end %>
</div>
This is what is wrong:
#person.things.map(&:id).Thing.to_s
And yes, in tables persons and things and validthings the column is named "Thing". It is a unique string in table validthings - the database structure was not my idea, I only work with it.
Found a helpful answer here: rails-accessing-current-value-of-a-symbol
to another subject, but my problem was that I did not know how to access the information that I knew must already be loaded.
This is how I can specify the default value of a collection_select to be the data from the database:
<div class="col-md-12">
<%= form_for(#person) do |f| %>
<%= f.fields_for :things do |d| %>
<%= d.hidden_field :id %><%= d.hidden_field :person_id %>
<%= d.collection_select(:Thing, Validthings.all, :Thing, :Thing, {:selected => d.object.Thing} ) %>
<% end %>
<% end %>
</div>
where d.object.Thing is the value of the respective object of the form element for the attribute "Thing", which is already present in the form.
I'd be very grateful for constructive ideas, in case my approach is un-ruby-like or some such. I am rather new to ruby, rails etc.

(Rails 4) Acts_as_taggable_on: using a model other than "Tag"

I am trying to implement the acts_as_taggable_on gem. In my set up I have a Model called Discipline which is pre-populated with about 40 names.
I also have a Model Micropost which I want to tag - using a select box containing all the names in the disciplines database. I thought that I could call the acts_as_taggable_on the Model I wanted - in this case Disciplines but its not working with my current set up.
class Micropost < ActiveRecord::Base
acts_as_taggable
acts_as_taggable_on :disciplines
end
Here is the form......
<%= simple_form_for(#micropost) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.input :tag_list, :as => :select,
:multiple => :true,
:collection => ActsAsTaggableOn::Tag.pluck(:name) %>
<%= f.text_area :content, placeholder: "What is your question?", :style => "height:75px;" %>
<%= f.submit "Post", class: "btn btn-primary" %>
<% end %>
I can tell from the documentation that there is a way to do this....but I guess I am just not getting it. Any suggestions?
I don't think you can use acts_as_taggable_on using a model other than the default Tag and Taggings models.
Alternative Approach #1
Seed your database with the pre-populated 40 Tags containing your discipline names.
Alternative Approach #2
Use bitmask_attributes for your 40 disciplines.
For example, in my application I have:
bitmask :instruments, as: [:others, :guitar, :piano, :bass, :mandolin, :banjo,
:ukulele, :violin, :flute, :harmonica, :trombone,
:trumpet, :clarinet, :saxophone, :viola, :oboe,
:cello, :bassoon, :organ, :harp, :accordion, :lute,
:tuba, :ocarina], null: false

Indicate that an uploaded file is present in edit form -- paperclip

In my current solution, I am able to put a checkbox in the edit form so that users can delete attachment. However, there is no indication for the user that a file has been uploaded, the name of that file, etc. so that he can decide whether to delete.
Right now the form look like this. The first material is an existing one, the next 3 are due to
def edit
#post = Post.find(params[:id])
3.times { #post.post_materials.new }
end
As you can see, it's very hard to distinguish between them. Ideally, I want the first material file name to appear somehow.
<%= form_for #post, :html => { :multipart => true } do |f| %>
<%= f.label :title %>
<%= f.text_field :title %>
Materials:
<ul>
<%= f.fields_for :materials, :html => { :multipart => true } do |materials_form| %>
<li>
<%= materials_form.label :asset %>
<%= materials_form.file_field :asset %>
<%= materials_form.label :_destroy, class: "checkbox inline" do %>
Remove attachment <%= materials_form.check_box :_destroy %>
<% end %>
</li>
<% end %>
</ul>
<%= f.submit "Submit", class: "btn btn-large" %>
<% end %>
Running paperclip's generator creates a migration to add 4 attributes on your model, as you can see here. These attributes are:
<attachment>_file_name
<attachment>_file_size
<attachment>_content_type
<attachment>_updated_at
So, If you ran the generator this way: rails generate paperclip post_material asset, on your PostMaterial model, you will have these attributes:
asset_file_name
asset_file_size
asset_content_type
asset_updated_at
Then, on your code you can do something like this:
if materials_form.object.asset.exists? #object represents the current post_material instance
#show a label with object.asset_file_name
else
#render materials_form.file_field :asset
end

Adding a Class to a link_to Helper With Only 1 Parameter

I have the following:
<% #users.each do |user| %>
<% if user.profile %>
<%= link_to user do %>
<h2><%= user.profile.first_name %> <%= user.profile.last_name %></h2>
<% end %>
<% end %>
<% end %>
The above code works fine. What this code does is that it will output the first and last names of every user. These names are clickable and will take me to that user's page. My main issue is with the 3rd line. The issue I am having is that I am trying to get rid of the link underline, but I am unsure as to how to pass a class into it. Below is my attempt. My class "no-text-dec" is just one line of "text-decoration: none;"
<%= link_to (user, class: "no-text-dec") do %>
I'm new to Rails, but I understand that link_to has a body, url options, and then html options in that specific order, but how can I make it work in this case? The above line makes my application is crash, but it's the only thing I can think of that makes sense. I'm assuming it's because I am not giving it its body argument, but I'm not sure what that would be.
This should work fine if user contains url/path correct
<%= link_to(user, class: 'some_class') %> do
<span>Delete</span>
<% end %>
The space after method in sending argument in helper method link_to is crashing your application
you can give a try at irb
def test(a,b)
puts a; puts b;
end
test ("Ad","Cd")
It should throw an error