I have a very basic table called radio_inventories
create_table "radio_inventories", id: false, force: true do |t|
t.integer "radio_id"
t.string "location"
t.string "distributor"
t.string "radio_user"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "radio_inventories", ["radio_id"], name:
"index_radio_inventories_on_radio_id"
Along with a very simple model:
class RadioInventory < ActiveRecord::Base
self.table_name = 'radio_inventories'
end
For some reason when I use the rails console to create new instances of these models and save them, it saves just fine
irb(main):001:0> x = RadioInventory.new
=> #<RadioInventory radio_id: nil, location: nil, distributor: nil, radio_user: nil, created_at: nil, updated_at: nil>
irb(main):002:0> x.radio_id = 123
=> 123
irb(main):003:0> x.save
(0.0ms) begin transaction
SQL (1.0ms) INSERT INTO "radio_inventories" ("created_at", "radio_id", "updated_at") VALUES (?, ?, ?) [["created_at", "2016-10-18 02:31:26.487353"], ["radio_id", 123], ["updated_at", "2016-10-18 02:31:26.487353"]]
(41.0ms) commit transaction
=> true
But when I then try to update the record I get an error. This happens when I use .save, .update, or .update_attributes.
irb(main):004:0> x = RadioInventory.first
RadioInventory Load (0.0ms) SELECT "radio_inventories".* FROM "radio_inventories" LIMIT 1
=> #<RadioInventory radio_id: 8565, location: nil, distributor: nil, radio_user: nil, created_at: "2016-10-18 02:22:59", updated_at: "2016-10-18 02:22:59">
irb(main):005:0> x.location = 'IT'
=> "IT"
irb(main):006:0> x.save
(0.0ms) begin transaction
(0.0ms) rollback transaction
TypeError: nil is not a symbol
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activemodel-4.1.8/lib/active_model/dirty.rb:162:in `attribute_was'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/attribute_methods/primary_key.rb:44:in `id_was'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/persistence.rb:494:in `_update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/locking/optimistic.rb:70:in `_update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/attribute_methods/dirty.rb:83:in `_update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/callbacks.rb:310:in `block in _update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.1.8/lib/active_support/callbacks.rb:82:in `run_callbacks'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/callbacks.rb:310:in `_update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/timestamp.rb:70:in `_update_record'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/persistence.rb:483:in `create_or_update'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/callbacks.rb:302:in `block in create_or_update'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.1.8/lib/active_support/callbacks.rb:82:in `run_callbacks'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/callbacks.rb:302:in `create_or_update'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/persistence.rb:103:in `save'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/validations.rb:51:in `save'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/attribute_methods/dirty.rb:21:in `save'
... 2 levels...
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:208:in `transaction'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:268:in `block in save'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:283:in `rollback_active_record_state!'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:267:in `save'
from (irb):6
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in `start'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in `start'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:69:in `console'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.1.8/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'irb(main):007:0>
I've also this with models/tables named "RadioStatus/radio_statuses" which also failed. But when I try with the model/table named 'RadioTracker/radio_trackers', everything works fine and as expected.
Any insight on why ActiveRecord behaves this way would be greatly appreciated.
When there is no default primary id for a table, Rails throws this error when we try to update a ActiveRecord object. so you can try putting self.primary_key = 'radio_id' at the beginning of RadioInventory model class.
And I see that in your migration there is id: false so I guess this is the problem.
You should do assign value on update_attributes:
x= RadioInventory.first
x.update_attributes(location: 'IT')
Related
This question already has answers here:
NoMethodError when I try to acces a field of an object taken from the DB
(4 answers)
Closed 7 years ago.
I've added a hstore attribute to my model:
class ChangePerDayAverageInterestToHstore < ActiveRecord::Migration
def change
add_column :companies, :per_day_average_interest, :hstore
end
end
Now when I generate the item via the console, I am able to query it without issue. Like so:
irb(main):002:0> t = Company.new per_day_average_interest: {1 => 10, 2 => 3}
irb(main):011:0> t.per_day_average_interest
=> {"1"=>"10", "2"=>"3"}
irb(main):013:0> t.per_day_average_interest["1"] => "10"
irb(main):014:0> t.per_day_average_interest["2"]
=> "3"
When I save it, then query it, I get a No Method error:
irb(main):028:0> t.save!
(0.2ms) BEGIN SQL (0.3ms) INSERT INTO "companies" ("created_at", "per_day_average_interest", "updated_at") VALUES ($1, $2, $3) RETURNING "id" [["created_at", "2015-06-08 19:24:39.694533"], ["per_day_average_interest", "\"1\"=>\"10\",\"2\"=>\"3\""], ["updated_at", "2015-06-08 19:24:39.694533"]]
(21.4ms) COMMIT
=> true
irb(main):029:0> d = Company.where(:id => 44)
Company Load (0.5ms) SELECT "companies".* FROM "companies" WHERE "companies"."id" = 44
=> #<ActiveRecord::Relation [#<Company id: 44, name: nil, average: nil, created_at: "2015-06-08 19:24:39", updated_at: "2015-06-08 19:24:39", revenue_average: nil, country: nil, job: nil, model_name:
nil, average_daily_interest: nil, per_day_average_interest: {"1"=>"10", "2"=>"3"}>]>
irb(main):030:0> d.per_day_average_interest
NoMethodError: undefined method `per_day_average_interest' for #<Company::ActiveRecord_Relation:0x007fa16d296dd0>
from /home/action/.gem/ruby/2.1.1/gems/activerecord-4.1.0/lib/active_record/relation/delegation.rb:136:in `method_missing'
from /home/action/.gem/ruby/2.1.1/gems/activerecord-4.1.0/lib/active_record/relation/delegation.rb:99:in `method_missing'
from (irb):30
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/console.rb:90:in `start'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/console.rb:9:in `start'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:69:in `console'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/action/.gem/ruby/2.1.1/gems/railties-4.1.0/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
Am I querying it the wrong way? Is there something I am missing?
Thanks!
The where statement returns the collection of objects and your column belongs to one object so you need to do the following
d = Company.where(:id => 44).first
As you can see d is ActiveRecord::Relation object, which is a wrapper of the all Company objects after filtering using where. The reader method per_day_average_interest is defined on the Company model instance, so you need to call as I have shown below.
d.first.per_day_average_interest
if you want all the values d.pluck(:per_day_average_interest).
I have a problem I create the following model in ROR
create_table "seat_types", :force => true do |t|
t.string "type"
t.string "description"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
but when I add data to the model in rails console the following error appears
the field type is a string not a foreign key
1.9.3-p547 :014 > SeatType
=> SeatType(id: integer, type: string, description: string, created_at: datetime, updated_at: datetime)
1.9.3-p547 :015 > a=SeatType.new
=> #<SeatType id: nil, type: nil, description: nil, created_at: nil, updated_at: nil>
1.9.3-p547 :016 > a.type="SC"
=> "SC"
1.9.3-p547 :017 > a.description="Servicio semicama"
=> "Servicio semicama"
1.9.3-p547 :018 > a.save
(0.2ms) BEGIN
SQL (0.5ms) INSERT INTO `seat_types` (`created_at`, `description`, `type`, `updated_at`) VALUES ('2014-12-02 16:02:37', 'Servicio semicama', 'SC', '2014-12-02 16:02:37')
(43.7ms) COMMIT
=> true
1.9.3-p547 :019 > a
=> #<SeatType id: 4, type: "SC", description: "Servicio semicama", created_at: "2014-12-02 16:02:37", updated_at: "2014-12-02 16:02:37">
1.9.3-p547 :020 > SeatType.all
SeatType Load (0.5ms) SELECT `seat_types`.* FROM `seat_types`
ActiveRecord::SubclassNotFound: The single-table inheritance mechanism failed to locate the subclass: 'A'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite SeatType.inheritance_column to use another column for that information.
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/inheritance.rb:143:in `rescue in find_sti_class'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/inheritance.rb:136:in `find_sti_class'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/inheritance.rb:62:in `instantiate'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/querying.rb:38:in `block (2 levels) in find_by_sql'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/querying.rb:38:in `collect!'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/querying.rb:38:in `block in find_by_sql'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/explain.rb:41:in `logging_query_plan'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/querying.rb:37:in `find_by_sql'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/relation.rb:171:in `exec_queries'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/relation.rb:160:in `block in to_a'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/explain.rb:34:in `logging_query_plan'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/relation.rb:159:in `to_a'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/relation/finder_methods.rb:159:in `all'
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/activerecord-3.2.19/lib/active_record/querying.rb:5:in `all'
from (irb):20
from /home/fernando/.rvm/gems/ruby-1.9.3-p547#ticket_master/gems/railties-3.2.19/lib/rails/commands/console.rb:47:in `start'
type is reserved name by STI mechanism, as the error says, so you can't name your column this way, unless you want to use STI. Name it kind, for example.
Reference:
http://guides.rubyonrails.org/active_record_basics.html#schema-conventions
ActiveRecord 4.1.1 is generating some peculiar SQL on save that postgres is choking on:
SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
PG::InvalidTextRepresentation: ERROR: invalid input syntax for type boolean: "uid"
I'm pretty sure that the "boolean" being referred to here is actually the WHERE() syntax which is expecting a boolean expression as an argument.
uid is defined as the primary key on my model (see below)... but why is it just saying WHERE('uid') when it's doing select_all (see stacktrace)? (and why is it doing select_all on save?)
Rails Console
p = Project.new(name: "test", description: "test", workflow_id: 1)
=> #<Project name: "test", description: "test", user_id: nil, uid: nil, created_at: nil, updated_at: nil, workflow_id: 1, active: nil>
irb(main):031:0> p.save
(1.9ms) BEGIN
Project Load (5.5ms) SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
PG::InvalidTextRepresentation: ERROR: invalid input syntax for type boolean: "uid"
LINE 1: SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
^
: SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
(1.7ms) ROLLBACK
ActiveRecord::StatementInvalid: PG::InvalidTextRepresentation: ERROR: invalid input syntax for type boolean: "uid"
LINE 1: SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
^
: SELECT "projects".* FROM "projects" WHERE ('uid') LIMIT 1
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:815:in `async_exec'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:815:in `block in exec_no_cache'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:815:in `exec_no_cache'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:137:in `exec_query'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/postgresql_adapter.rb:947:in `select'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:31:in `select_all'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract/query_cache.rb:69:in `select_all'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/querying.rb:39:in `find_by_sql'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/relation.rb:603:in `exec_queries'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/relation.rb:487:in `load'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/relation.rb:231:in `to_a'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/relation/finder_methods.rb:451:in `find_take'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/relation/finder_methods.rb:98:in `take'
... 41 levels...
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:219:in `within_new_transaction'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/transactions.rb:208:in `transaction'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/transactions.rb:268:in `block in save'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/transactions.rb:283:in `rollback_active_record_state!'
from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.1/lib/active_record/transactions.rb:267:in `save'
from (irb):31
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.1/lib/rails/commands/console.rb:90:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.1/lib/rails/commands/console.rb:9:in `start'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:69:in `console'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.1/lib/rails/commands.rb:17:in `<top (required)>'
from /app/bin/rails:4:in `require'
from /app/bin/rails:4:in `<main>
Model
class Project < ActiveRecord::Base
self.primary_key = "uid"
end
ActiveRecord mixin for generating IDs
module ActiveRecordUIDExtension
extend ActiveSupport::Concern
def generate_uid
return unless self.class.column_names.include?("uid")
self.id = SecureRandom.random_number(36**10).to_s(36)
while !self.class.find_by(:uid, self.id).nil? do
self.id = SecureRandom.random_number(36**10).to_s(36)
end
end
end
ActiveRecord::Base.send(:include, ActiveRecordUIDExtension)
ActiveRecord::Base.send(:before_create, :generate_uid)
Gemfile.lock
activerecord (4.1.1)
activemodel (= 4.1.1)
activesupport (= 4.1.1)
arel (~> 5.0.0)
Your mixin doesn't make any sense. This part right here is causing the bad SQL:
self.class.find_by(:uid, self.id)
That's producing invalid SQL because you're telling it to. find_by has a flexible interface so it has to do some parsing to see how you're calling it. When you say:
find_by(a, b)
the argument parsing probably assumes that you're trying to use this form:
find_by('some_sql_snippet', placeholder_valid)
as in this example from the docs:
find_by("published_at < ?", 2.weeks.ago)
Then it will probably to_s the first argument and scan it for placeholders. When you say:
find_by(:uid, self.id)
you'll end up with :uid.to_s and self.id will be ignored because there aren't placeholders in that string. That would explain why you're seeing where ('uid') in the SQL.
Fix your mixin to make sense:
self.class.find_by(:uid => self.id)
or better, switch to exists? to avoid building a whole model instance just to see if there's a row in the database:
self.class.where(:uid => self.id).exists?
self.class.exists?(:uid => self.id)
It was a mistake, but I called some model Test (cause it actually a test). Now it is really late to rollback it and give model another name, because this way I need to check a lot of code on changing model name.
Problem. When I call anything about Test in console, it causes error.
>> User.last
#<User id: 44, email: nil, password_digest: nil, created_at: "2013-05-08 11:26:04", updated_at: "2013-05-08 11:26:04", guest: true>
User Load (4.0ms) SELECT "users".* FROM "users" ORDER BY "users"."id" DESC LIMIT 1
>> #test=Test.last
NoMethodError: undefined method `last' for Test:Module
from (irb):7
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:41:in `<top (required)>'
from C:/Users/HP/study/script/rails:6:in `require'
from C:/Users/HP/study/script/rails:6:in `<top (required)>'
from -e:1:in `load'
from -e:1:in `<main>'
What can I do?
You can rename the model, rails g migration rename_test. Then edit the migration like so
class RenameTest < ActiveRecord::Migration
def self.up
rename_table :test, :my_test
end
def self.down
rename_table :my_test, :test
end
end
I am try on to insert a value via the Rails console into the database, but it's not working.
the first command is
u=users.create(:name=>"bob",:address=>"Dublin")
this is the output after I running the first command
u=Users.create(:name=>"Ben",:address=>"Dublin")
(0.2ms) BEGIN
SQL (0.3ms) INSERT INTO `users` (`address`, `created_at`, `email`, `name`, `password`, `updated_at`) VALUES ('Dublin', '2012-04-16 23:15:48', NULL, 'Ben', NULL, '2012-04-16 23:15:48')
(9.1ms) COMMIT
=> #<Users id: 2, name: "Ben", password: nil, email: nil, address: "Dublin", created_at: "2012-04-16 23:15:48", updated_at: "2012-04-16 23:15:48">
this is the second command
t=tweets.create(:status=>"I am a tweet from bob",:user=>u)
NameError: undefined local variable or method `tweets' for main:Object
from (irb):4
from /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start'
from /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start'
from /opt/bitnami/ruby/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
Assuming you have a Tweet model, you want
u = User.first
t = Tweet.create(:status => "I am a tweet from bob", :user => u)