NoMethodError undefined method 'each' for "" :String

Question

Upon attempting to update my table in rails, I am receiving the error:

undefined method 'each' for "StringHere" :String

This line is causing the error:

current_user.events = eventstring

I've also tried used the update method as

current_user.update(events: eventstring)

and received the same error.

Here is my StackTrace

activerecord (4.2.5) lib/active_record/associations/collection_association.rb:365:in `replace'
activerecord (4.2.5) lib/active_record/associations/collection_association.rb:47:in `writer'
activerecord (4.2.5) lib/active_record/associations/builder/association.rb:123:in `events='
activerecord (4.2.5) lib/active_record/attribute_assignment.rb:54:in `public_send'
activerecord (4.2.5) lib/active_record/attribute_assignment.rb:54:in `_assign_attribute'
activerecord (4.2.5) lib/active_record/attribute_assignment.rb:41:in `block in assign_attributes'
activerecord (4.2.5) lib/active_record/attribute_assignment.rb:35:in `each'
activerecord (4.2.5) lib/active_record/attribute_assignment.rb:35:in `assign_attributes'
activerecord (4.2.5) lib/active_record/persistence.rb:251:in `block in update'
activerecord (4.2.5) lib/active_record/transactions.rb:351:in `block in with_transaction_returning_status'
activerecord (4.2.5)   lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
activerecord (4.2.5) lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
activerecord (4.2.5) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
activerecord (4.2.5) lib/active_record/transactions.rb:220:in `transaction'
activerecord (4.2.5) lib/active_record/transactions.rb:348:in `with_transaction_returning_status'
activerecord (4.2.5) lib/active_record/persistence.rb:250:in `update'
app/controllers/users_controller.rb:43:in `update'
actionpack (4.2.5) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.2.5) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.5) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.5) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.5) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.5) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.2.5) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.5) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.5) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.5) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.5) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.5) lib/action_controller/metal.rb:237:in `block in action'
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:76:in `call'
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:76:in `dispatch'
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:45:in `serve'
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:30:in `each'
actionpack (4.2.5) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.5) lib/action_dispatch/routing/route_set.rb:817:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/builder.rb:63:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:38:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.2.5) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.2.5)     lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
activerecord (4.2.5) lib/active_record/migration.rb:377:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.5) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.5) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.5) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.5) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
web-console (2.2.1) lib/web_console/middleware.rb:31:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.5) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.5) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.5) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.5) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.5) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.5) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.5)     lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.5) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
railties (4.2.5) lib/rails/engine.rb:518:in `call'
railties (4.2.5) lib/rails/application.rb:165:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
rack (1.6.4) lib/rack/content_length.rb:15:in `call' 
rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
C:/Ruby22-x64/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
C:/Ruby22-x64/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
C:/Ruby22-x64/lib/ruby/2.2.0/webrick/server.rb:294:in `block in  start_thread'

My 'user' model:

class User < ActiveRecord::Base
class << self
    def from_omniauth(auth_hash)
        user = find_or_create_by(uid: auth_hash['uid'], provider: auth_hash['provider'])
        user.name = auth_hash['info']['name']
        user.location = auth_hash['info']['location']
        user.image_url = auth_hash['info']['image']
        user.url = auth_hash['info']['urls']['user.provide.capitalize']
        user.email = auth_hash['info']['email']
        user.school = nil
        user.save!
        user
    end
end
has_many :userevents
    has_many :events, :through => :userevents

end

The 'event' model:

class Event < ActiveRecord::Base
has_many :userevents
has_many :users, :through => :userevents

end

The 'userevent' model:

class Userevent < ActiveRecord::Base
belongs_to :user
belongs_to :event

def self.dedupe
    grouped = all.group_by{|ue| [ue.user_id, ue.event_id]}
    grouped.values.each do |dupes|
        first_one = dupes.shift
        dupes.each{|double| double.destroy}
    end
end

end

Please help!

I am just guessing, but it seems that you have two associated models User and Event. User 'has many' events. Therefore each is getting called. However in rails each doesn't work on string, hence the error. — rohan, Jan 10 '16 at 13:40
@user3282479 yeah, there's a line stating "has_many :events, :through => :userevents" How should I fix it? — uccblack, Jan 10 '16 at 13:43
Do not pass a string, where rails expects an 'Event' object(s). — rohan, Jan 10 '16 at 13:45

score 0 · Accepted Answer · answered Jan 10 '16 at 13:51

You defined events(association) and you tried to assing string on events it raise error.

You can not assign string to association. if you create events string column on user model. you should change events column name or change events association(has_many) name. This makes conflict.

NoMethodError undefined method 'each' for "" :String

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