Rails Missing host to link to Please provide host parameter or set default url options host

Question

I have been googling for about 90 minutes now and still don t have an answer to this   Where do I set default url options   I ve already set it for config action mailer default url options to solve this same bug elsewhere  but now I m getting this error when trying to use a URL helper inside an RSpec spec   I have no idea where it s expecting default url options to be set    Failure Error  listing url listing  should match     d - w      RuntimeError     Missing host to link to  Please provide  host parameter or set default url options  host       spec routing listing routing spec rb 9 in  block  3 levels  in  lt top  required  gt     This code has nothing to do with emails ActionMailer  it just happens to need a URL instead of a path   Any ideas

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The host should be specified in each environment s config file  Eg   config environments development rb   See this question and this question

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You can always pass host as a parameter to the URL helper   listing url listing  host  request host

User · Answer

go to config environments test rb  Rails application routes default url options  host     localhost 3000

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Set default url options to use your action mailer default url options   In each of your environment files  e g  development rb  production rb  etc   you can specify the default url options to use for action mailer   config action mailer default url options     host   lvh me   port   3000      However  these are not set for MyApp Application default url options     MyApp  Application config action mailer default url options    gt    host  gt  lvh me    port  gt  3000      MyApp  Application default url options    gt       That s why you are getting that error in anything outside of ActionMailer   You can set your Application s default url options to use what you defined for action mailer in the appropriate environment file  development rb  production rb  etc     To keep things as DRY as possible  do this in your config environment rb file so you only have to do this once     Initialize the rails application MyApp  Application initialize     Set the default host and port to be the same as Action Mailer  MyApp  Application default url options   MyApp  Application config action mailer default url options   Now when you boot up your app  your entire Application s default url options will match your action mailer default url options      MyApp  Application config action mailer default url options    gt    host  gt  lvh me    port  gt  3000      MyApp  Application default url options    gt    host  gt  lvh me    port  gt  3000     Hat tip to  pduersteler for leading me down this path

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just in case someone finds this searching for errors concerning ActiveStorage   if you have a controller-action where you want to generate upload-urls etc with the local disc-service  most likely in test environment   you need to include ActiveStorage  SetCurrent in the controller in order to allow blob service url for direct upload to work correctly

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You need to add the following line at every environment   config action mailer default url options      host   gt   yourhost     That way  it can work in all environments and could be different from environment to environment  For example   development rb  config action mailer default url options      host   gt   dev yourhost com      test rb  config action mailer default url options      host   gt   test yourhost com      production rb  config action mailer default url options      host   gt   www yourhost com

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You can set default url options in the Application Controller   class ApplicationController  lt  ActionController  Base   def default url options       locale   gt  I18n locale    end end   http   guides rubyonrails org action controller overview html default url options

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When you use any listing url method the full URL will be returned not a relative one as normal   That s why rails is asking you for the host  to compute the whole URL   How you can tell rails the host  You can do it in several ways   1 Adding this option to each environment     config development rb  config action mailer default url options     host   localhost 3000      config test rb  config action mailer default url options     host   localhost 3000      config production rb  config action mailer default url options     host   www example com      NOTE  If you are working inside a rails engine remember to do the same for your dummy app inside the engine tests  path to your engine test dummy config environments   because when you test the engine it s what rails is testing against   2 Add the host option to the foo url method like this   listing url listing  host  request host      gt   http   localhost 3000 listings 1    3 Not output the host with the option  only path to true   listing url listing  only path  true       gt    listings 1       IMHO I don t see the point on this one because in this case I would use the listing path method

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Adding the default url in routes not the right solution although  it works for some cases   You ve to set the default url in each environment development  test  production    You need make these changes       config environments development rb      config action mailer default url options             host   gt   your-host-name      if it is local then  localhost 3000    config environments test rb       config action mailer default url options             host   gt   your-host-name      if it is local then  localhost 3000     config environments development rb      config action mailer default url options             host   gt   your-host-name      if it is local then  localhost 3000

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Your  Application routes draw do   default url options  host   gt   example com           snip     end   Somewhere in routes rb

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Rails application routes default url options  host    localhost 3000   In the developemnt rb   test rb  can be more concise as following   Rails application configure do         other config        routes default url options  host     localhost 3000  end

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The above answer did not work for me  at least not as I wanted   I realised  config action mailer default url options     host   localhost   port  3000   after installing devise  Hope it will help someone with the same problem

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I had this same error  I had everything written in correctly  including the Listing 10 13 from the tutorial   Rails application configure do       config action mailer raise delivery errors   true config action mailer delevery method  test host    example com  config action mailer default url options     host  host         end   obviously with  example com  replaced with my server url   What I had glossed over in the tutorial was this line      After restarting the development server to activate the configuration      So the answer for me was to turn the server off and back on again

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I solved the issue by configuring environment rb as  YourApp  Application default url options   YourApp  Application config action mailer default url options  You need to set default url options for action mailer against each environment like development  testing  staging and production etc   Reference  Missing host to link to  Please provide  host parameter or set default url options  host

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Funny thing  that setting config action mailer default url options does not help for me  Also  messing around with environment-independent settings in places I felt like it does not belong was not satisfying for me  Additionally  I wanted a solution that worked when generating urls in sidekiq resque workers   My approach so far  which goes into config environments  development  production  rb     MyApp  Application configure do       Stuff omitted         config action mailer default url options             Set things here as usual       end  MyApp  Application default url options   MyApp  Application config action mailer default url options   This works for me in rails    3 2 x

[ruby-on-rails] Rails: Missing host to link to! Please provide :host parameter or set default_url_options[:host]

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