Can I Pass Default Value To Rails Generate Migration?


Answer :

You can't: https://guides.rubyonrails.org/active_record_migrations.html#column-modifiers

null and default cannot be specified via command line.

The only solution is to modify the migration after it's generated. It was the case in Rails 3, still the case in Rails 6


Rails migration generator does not handle default values, but after generation of migration file you should update migration file with following code 

add_column :users, :disabled, :boolean, default: false

you can also see this link - http://api.rubyonrails.org/classes/ActiveRecord/Migration.html


Default migration generator in Rails does not handle default values, there is no way around as of now to specify default value defined through terminal in rails migration.

you would like to follow below steps in order to achieve what you want

1). Execute 

$ rails generate migration add_disabled_to_users disabled:boolean

2). Set the new column value to TRUE/FALSE by editing the new migration file created.

class AddDisabledToUsers < ActiveRecord::Migration   def change     add_column :users, :disabled, :boolean, default: false   end end

3). Run above generated migration by Executing.

$ rake db:migrate

Comments

Post a Comment

Popular posts from this blog

Converting A String To Int In Groovy

Answer : Use the toInteger() method to convert a String to an Integer , e.g. int value = "99".toInteger() An alternative, which avoids using a deprecated method (see below) is int value = "66" as Integer If you need to check whether the String can be converted before performing the conversion, use String number = "66" if (number.isInteger()) { int value = number as Integer } Deprecation Update In recent versions of Groovy one of the toInteger() methods has been deprecated. The following is taken from org.codehaus.groovy.runtime.StringGroovyMethods in Groovy 2.4.4 /** * Parse a CharSequence into an Integer * * @param self a CharSequence * @return an Integer * @since 1.8.2 */ public static Integer toInteger(CharSequence self) { return Integer.valueOf(self.toString().trim()); } /** * @deprecated Use the CharSequence version * @see #toInteger(CharSequence) */ @Deprecated public static Integer toInteger(String self) { return toInteg
Read more

"Cannot Create Cache Directory /home//.composer/cache/repo/https---packagist.org/, Or Directory Is Not Writable. Proceeding Without Cache"

Answer : if anyone pass through here, this is shorter solution: sudo chown -R $USER $HOME/.composer it seems to me the group information is missing in your command sudo chown -R <user> /home/<user>/.composer/cache/repo/https---packagist.org Shoud be sudo chown -R <user>:<group> /home/<user>/.composer/cache/repo/https---packagist.org But to avoid other permission issues, I would rather advise: sudo chown -R <user>:<group> /home/<user>/.composer/cache (you'll need access to other folders in there) and sudo chown <user>:<group> /home/<user>/.composer To make sure your user has permissions enough on the global composer folder. Mind the missing recursion so the user don't own keys created by root. If you need to find out the group: groups <user>
Read more

Android How Can I Convert A String To A Editable

Answer : As you probably found out, Editable is an interface so you cannot call new Editable() . However an Editable is nothing more than a String with Spannables, so use SpannableStringBuilder: Editable editable = new SpannableStringBuilder("Pass a string here"); If you only want to change the Spannables, never the text itself, you can use a basic SpannableString. Use Editable.Factory.getInstance().newEditable(str) From the android documentation: Returns a new SpannedStringBuilder from the specified CharSequence. You can override this to provide a different kind of Spanned.
Read more