How to have a drop down select field in a rails form

Question

I am creating a scaffold -  rails g scaffold Contact email string email provider string    but I want the email provider to be a drop down  with gmail yahoo msn as options  and not a text field  How can I do this

User · Answer

lt    f select  email provider    gmail   yahoo   msn    gt

User · Answer

In your model   class Contact   self email providers    w Gmail Yahoo MSN    validates  email provider   inclusion   gt  email providers end   In your form     lt    f select  email provider       options for select Contact email providers   contact email provider    gt    the second arg of the options for select will have any current email provider selected

User · Answer

Or for custom options   lt    f select  desired attribute    option1    option2    gt

User · Answer

Rails drop down using has many association for article and category   has many  articles  belongs to  category   lt    form select  category id Category all pluck  name  id   prompt  select    class   form-control    gt

User · Answer

You create the collection in the Contact controller -   app controllers contacts controller erb    Adding   providers   Provider all by name   to the new  create and edit methods  using a scope for the by name in the Provider model - app models provider rb - for the ordering by name  scope by name  order  name    Then in the view - app views contacts  form html erb - you use    lt    f collection select  provider id   providers   id   name  include blank  true   gt    For rails forms  I also strongly recommend you look at a form builder like simple form - https   github com plataformatec simple form - which will do all the heavy lifting

User · Answer

You can take a look at the Rails documentation   Anyways   in your form       lt    f collection select  provider id  Provider order  name   id  name  include blank  true   gt    As you can guess   you should predefine email-providers in another model -Provider   to have where to select them from

User · Answer

This is a long way round  but if you have not yet implemented then you can originally create your models this way  The method below describes altering an existing database   1  Create a new model for the email providers    rails g model provider name  2  This will create your model with a name string and timestamps  It also creates the migration which we need to add to the schema with    rake db migrate  3  Add a migration to add the providers ID into the Contact    rails g migration AddProviderRefToContacts provider references  4  Go over the migration file to check it look OK  and migrate that too    rake db migrate  5  Okay  now we have a provider id  we no longer need the original email provider string    rails g migration RemoveEmailProviderFromContacts  6  Inside the migration file  add the change which will look something like   class RemoveEmailProviderFromContacts  lt  ActiveRecord  Migration   def change     remove column  contacts   email provider   end end   7  Once that is done  migrate the change    rake db migrate  8  Let s take this moment to update our models  Contact  belongs to  provider Provider  has many  contacts  9  Then  we set up the drop down logic in the  form html erb partial in the views        lt div class  field  gt       lt    f label  provider   gt  lt br gt       lt    f collection select  provider id  Provider all   id   name   gt     lt  div gt    10  Finally  we need to add the provders themselves  One way top do that would be to use the seed file   Provider destroy all  gmail   Provider create  name   gmail   yahoo   Provider create  name   yahoo   msn   Provider create  name   msn       rake db seed

User · Answer

Please have a look here  Either you can use rails tag Or use plain HTML tags  Rails tag   lt    select  Contact    email provider   Contact  PROVIDERS    include blank   gt  true     gt     above line of code would become HTML code HTML Tag   find it below    HTML tag   lt select name  Contact email provider   gt     lt option gt  lt  option gt     lt option gt yahoo lt  option gt     lt option gt gmail lt  option gt     lt option gt msn lt  option gt   lt  select gt

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