Ruby on Rails: params es nulo. método indefinido `[] 'para nil: NilClass
Recibo un error al intentar acceder a una página de búsqueda que he realizado. El problema parece ser que estoy tratando de eliminar espacios en blanco cuando no hay ninguno allí. Mi función de búsqueda funciona, pero tengo problemas para manejar el caso cuando las tecnologías son nulas.
Aquí está mi error:
NoMethodError in ProjectsController#search
undefined method `[]' for nil:NilClass
En mi controlador de proyecto, línea 26:
tech_ids = params["technols"]["id"].reject(&:blank?).
Aquí está mi acción de búsqueda:
def search
tech_ids = params["technols"]["id"].reject(&:blank?)
@search = params[:client], params[:industry], params[:role], tech_ids, params[:business_div], params[:project_owner], params[:status], params[:start_date_dd], params[:start_date_A], params[:start_date_B], params[:keywords]
@project_search = Project.search(*@search).order(sort_column + ' ' + sort_direction).paginated_for_index(per_page, page)
@search_performed = !@search.reject! { |c| c.blank? }.empty?
@project = Project.new(params[:project])
@all_technols = Technol.all
@project_technol = @project.projecttechnols.build
respond_to do |format|
format.html # search.html.erb
format.json { render :json => @project }
end
end
Aquí está mi modelo de proyecto:
class Project < ActiveRecord::Base
attr_accessible :edited_first_name, :edited_last_name, :first_name, :last_name, :business_div, :client, :customer_benifits, :edited_date, :end_date, :entry_date, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary, :tech
validates_presence_of :business_div, :client, :customer_benifits, :end_date, :exception_pm, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary#, :tech
has_many :projecttechnols
has_many :technols, :through => :projecttechnols
def self.like(text); "%#{text}%"; end
def self.search(search_client, search_industry, search_role, search_techs_ids, search_business_div, search_project_owner, search_status, search_start_date_dd, search_start_date_A, search_start_date_B, search_keywords)
# start with a scoped query, to apply more scopes on it afterwards
_projects = Project.scoped
# then, for each of the parameters, apply the scope only if present
if search_client.present?
_projects = _projects.where ['client LIKE ?', like(search_client)]
end
if search_industry.present?
projects = _projects.where ['industry LIKE ?', like(search_industry)]
end
if search_role.present?
_projects = _projects.where ['role LIKE ?', like(search_role)]
end
if search_techs_ids.present?
_projects = _projects.joins(:technols).where("technols.id" => search_techs_ids)
end
if search_business_div.present?
_projects = _projects.where ['business_div LIKE ?', like(search_business_div)]
end
if search_project_owner.present?
_projects = _projects.where ['project_owner LIKE ?', like(search_project_owner)]
end
if search_exception_pm.present?
_projects = _projects.where ['exception_pm LIKE ?', like(search_exception_pm)]
end
if search_status.present?
_projects = _projects.where ['status LIKE ?', like(search_status)]
end
todays_date = DateTime.now.to_date
if !search_start_date_A.blank? or !search_start_date_B.blank?
search_start_date_A = Date.parse(search_start_date_A).strftime("%Y-%m-%d")
search_start_date_B = Date.parse(search_start_date_B).strftime("%Y-%m-%d")
todays_date = nil
search_start_date_dd = nil
end
if search_start_date_dd.blank?
todays_date = nil
end
if search_start_date_A.present? or search_start_date_B.present?
_projects = _projects.where [' DATE(start_date) BETWEEN ? AND ?', search_start_date_A, search_start_date_B]
end
if search_start_date_dd.present?
_projects = _projects.where ['DATE(start_date) BETWEEN ? AND ?', search_start_date_dd, todays_date]
end
if search_keywords.present?
_projects = _projects.where ['keywords LIKE ?', like(search_keywords)]
end
_projects
end
def self.paginated_for_index(projects_per_page, current_page)
paginate(:per_page => projects_per_page, :page => current_page)
end
end
He intentado ajustar una instrucción if alrededor de la línea que está causando problemas, pero todavía no puedo solucionarlo.
if !params[:technols][:id] = []
tech_ids = params[:technols][:id].reject(&:blank?)
end
Soy nuevo en los rieles, por lo que cualquier ayuda para solucionar mi problema será apreciada. Gracias por adelantado.
Rastreo de pila:
app/controllers/projects_controller.rb:26:in `search'
actionpack (3.2.6) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.6) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.6) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.6) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.6) lib/active_support/callbacks.rb:425:in `_run__464544557__process_action__932090261__callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.6) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.6) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.6) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.6) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.6) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.6) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.6) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.6) lib/action_controller/metal/params_wrapper.rb:206:in `process_action'
activerecord (3.2.6) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.6) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.6) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.6) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:600:in `call'
warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
warden (1.2.1) lib/warden/manager.rb:34:in `catch'
warden (1.2.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__67848467__call__896299115__callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.6) lib/rails/engine.rb:479:in `call'
railties (3.2.6) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.6) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.0) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.0) lib/thin/connection.rb:79:in `catch'
thin (1.5.0) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.0) lib/thin/connection.rb:54:in `process'
thin (1.5.0) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run_machine'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run'
thin (1.5.0) lib/thin/backends/base.rb:63:in `start'
thin (1.5.0) lib/thin/server.rb:159:in `start'
rack (1.4.1) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.1) lib/rack/server.rb:265:in `start'
railties (3.2.6) lib/rails/commands/server.rb:70:in `start'
railties (3.2.6) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.6) lib/rails/commands.rb:50:in `tap'
railties (3.2.6) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'