Ruby on Rails: params jest zerowy. niezdefiniowana metoda `[] 'dla nil: NilClass

Question

Oct 03, 2012, 11:27 AM

Ruby on Rails: params jest zerowy. niezdefiniowana metoda `[] 'dla nil: NilClass

Podczas próby uzyskania dostępu do strony wyszukiwania pojawia się błąd. Wydaje się, że problem polega na tym, że próbuję usunąć spacje, gdy ich tam nie ma. Moja funkcja wyszukiwania działa, ale mam problem z obsługą przypadku, gdy technols są zerowe.

Oto mój błąd:

NoMethodError in ProjectsController#search

undefined method `[]' for nil:NilClass

w moim kontrolerze projektu, linia 26:

tech_ids = params["technols"]["id"].reject(&:blank?).

Oto moja akcja wyszukiwania:

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

Oto mój model projektu:

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

Próbowałem zawinąć instrukcję if wokół linii powodującej problemy, ale wciąż nie mogę tego naprawić.

if !params[:technols][:id] = []
tech_ids = params[:technols][:id].reject(&:blank?)
end

Jestem nowy w szynach, więc każda pomoc w rozwiązaniu mojego problemu zostanie doceniona. Z góry dziękuję.

Ślad stosu:

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>'

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