logo
down
shadow

How to make a many to many association in rails


How to make a many to many association in rails

By : user2951483
Date : November 18 2020, 11:13 AM
should help you out If you want to get the data from your join table forum_users then use has_many :through
code :
  class Forum < ActiveRecord::Base
    has_many :users, through: :forum_users
  end

  class User < ActiveRecord::Base
    has_many :forums, through: :forum_user 
  end


  class ForumUser < ActiveRecord::Base
    belongs_to :user
    belongs_to :forum
   end


Share : facebook icon twitter icon
How to make an association across 3 tables with activerecord / rails?

How to make an association across 3 tables with activerecord / rails?


By : user2180481
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I have 3 models defined: , I think this will get you the results you want.
code :
# palette table:
# id INT
class Palette < ActiveRecord::Base
    has_many :swatches
    has_many :colors, :through => :swatches
end

# swatch table:
# id INT
# palette_id INT
# color_id INT
class Swatch < ActiveRecord::Base
    belongs_to :palette
    belongs_to :color
end
@colors = @palette.colors
How create record in HABTM Rails Association How make this?

How create record in HABTM Rails Association How make this?


By : Serenix
Date : March 29 2020, 07:55 AM
it helps some times You should highly consider using has_many, :through as that's the preferred way to do these kinds of relationships now in Rails.
That said, if you want to continue with has_and_belongs_to_many, you need to somehow get the journal and post ids that you want to associate so you can correctly create the association.
code :
resources :journals do
  member do
    put :add_post
  end
end
def add_post
  @journals_posts = JournalsPosts.new(:journal_id => params[:id], :post_id => params[:post_id])

  if @journals_posts.save
    ...
  else
    ...
  end
end
How to make sure that association exists and load it to avoid N+1 in rails

How to make sure that association exists and load it to avoid N+1 in rails


By : Rostomides
Date : March 29 2020, 07:55 AM
around this issue Have you tried User.includes(:houses).joins(:houses).uniq?
You should see a second select, pulling all houses. So whenever you do user.houses they are in memory for you.
Rails & JQuery: Invalid association. Make sure that accepts_nested_attributes_for is used for

Rails & JQuery: Invalid association. Make sure that accepts_nested_attributes_for is used for


By : Louis Smit
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Although I'd like to add link_to_add with using simple_nested_form_for, the following error was displayed. , div#room should be something like :
code :
<div id="room">
  <%= f.simple_fields_for :rooms do |a| %>
    <p class="day-number-element-selector"><b>Day&nbsp;<%= a.index.to_i + 1 %></b></p>

      <% a.simple_fields_for :events do |e| %>
        <div id="event">
         <%= e.input :from %>
        </div>
      <% end %>
    #add here!!!

    <%= a.link_to_add "Add event", :events, data: {target: '#event'}, class: "btn btn-primary" %>

    <%= a.input :room %>

  <% end %>
</div>
How make association on Rails 4 and Up?

How make association on Rails 4 and Up?


By : ShamrockGuy
Date : March 29 2020, 07:55 AM
may help you . In your Location you define a has_many :users and then you accepts_nested_attributes_for :user, allow_destroy: true (:users vs :user) so it's looking for a different association than the you created.
It also seems like you're creating a user form which will go through the User model to try and create locations but your models are set up such that you create users through a location (so your model doesn't match your view).
code :
def user_params
  ...location_attributes:[:id, :country, :state])
end
belongs_to :location

accepts_nested_attributes_for :location, allow_destroy: true
has_many :users
Related Posts Related Posts :
  • middleman app it is possible to create a contact form?
  • How to refactor this piece of code
  • How can I know if a user has access to all or just some resources with Cancan?
  • How can I run a ruby class from rake file?
  • Send JSON data as post method from rails controller to a web service
  • How to test Controllers under different namespaces and why this test fails?
  • rspec expect condition OR condition
  • Page loads unnecessary queries Ruby On Rails
  • Why "bundle install" try to install outdated version of gems?
  • Rails - Customize model validation error messages but without a database
  • When to switch from cucumber to rspec in the BDD cycle for a login procedure
  • Multipart response for web service
  • How to hide Add new option in Rails Admin
  • Override CollectionProxy find method
  • Rails 4 simple_form has_many through check boxes not saving
  • ruby on rails authentication using devise gem
  • Rails iteration over arrays and hashes
  • Creating inline date_select dropdowns using simple_form and zurb foundation
  • NameError in SongsController#index uninitialized constant Song::FriendlyId
  • Rails how to improve if record exists?
  • omniauth custom request phase form
  • Rails 5 - Saving the absolute current url via a button to a cookie?
  • How can / should I override the `build` method for a my model?
  • Install Rails Failed on OSX 10.8.4
  • ruby on rails - undefined method valid?
  • Users Registration on POST
  • Rails application variables in carrierwave store_dir
  • How to customize simple_form for json nested hash
  • Couldn't find file 'jquery', Sprockets::FileNotFound in StaticPages#home error
  • How should I use the alias_method_chain for the build method?
  • how to create two custom registration forms in devise?
  • Rails 4 link_to Destroy not working in Getting Started tutorial
  • How does ruby on rails dynamically define `find_by_id`, `find_by_name` methods?
  • JBuilder dynamic keys for model attributes
  • `initialize': No such file or directory - getaddrinfo (Errno::ENOENT) when Rails new app
  • What is the Ruby equivalent of Node.js' socket.io?
  • Where rails store standard helpers?
  • how to check expected result matches any of give values in rspec?
  • Form submission to create multiple objects
  • Simple Twitter Login with Rails and Email confirmation
  • Where should helpful functions for my controller go in Rails?
  • Using session variable in the Model or the other way
  • Why can't I have ruby code and comments in Embedded Ruby?
  • Rails: How can I make an object available in all views?
  • Cannot enter simply form information into SQLite DB (Rails)
  • Rails - Retain form values on failed submission. Getting "First argument in form cannot contain nil or be empty&quo
  • How to handle STI and build related models automatically?
  • Suppress an error when saving a record in Rails
  • Rails AJAX reload the page. Why?
  • How to pass user attributes to action mailer
  • Custom Validator to Prevent an appointment from being scheduled too early in day?
  • Postgres Enable TCP/IP Connection
  • How do I avoid the circular argument reference warning in activesupport
  • Unable to push to heroku master because of rails/spring version error
  • deep nested routes in rails
  • Best approach to Users Profile Images in Rails App
  • RailsInstaller: Can I maintain the gem fold when re-installing a new version?
  • couldn't find file 'jquery-ui' i get this error even after having this file in my application.js
  • Ruby regex to split user and date text input
  • Tool like BetterErrors for JRuby?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org