Ruby on Rails：params是零。 未定义的方法`’为nil：NilClass
我试图访问我所做的搜索页面时收到错误。 问题似乎是我试图在没有任何空白时删除空白。 我的搜索function有效，但是当technols为零时我无法处理这个案例。
这是我的错误：
NoMethodError in ProjectsController#search undefined method `[]' for nil:NilClass 在我的项目控制器中，第26行：
tech_ids = params["technols"]["id"].reject(&:blank?).
这是我的搜索操作：
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
这是我的项目模型：
class Project :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
我已经尝试在导致问题的行周围包装一个if语句，但似乎仍无法修复它。
if !params[:technols][:id] = [] tech_ids = params[:technols][:id].reject(&:blank?) end
我是rails的新手，所以任何帮助解决我的问题都将不胜感激。 提前致谢。
堆栈跟踪：
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 ' railties (3.2.6) lib/rails/commands.rb:50:in `tap' railties (3.2.6) lib/rails/commands.rb:50:in `' script/rails:6:in `require' script/rails:6:in `'
你的问题是params [：technols]是nil而你正在尝试从nil对象中检索id key的值。 你需要做 –
tech_ids = params[:technols][:id].reject(&:blank?) unless params[:technols].nil?