ruby-on-rails-4

问题 I am using pdf-reader for parsing the pdf and converting it to the object and plucking out the Highlight and underlined object from the pdf but the problem I am not able to pluck out the text from that object I checked other algo to for the reference and found that they are plucking the Contents from the Highlighted object but when I check it returning me nil as there is no such element in the object here is my algo which I used to get the highlighted objects from the pdf def read_pdf puts

问题 I am using pdf-reader for parsing the pdf and converting it to the object and plucking out the Highlight and underlined object from the pdf but the problem I am not able to pluck out the text from that object I checked other algo to for the reference and found that they are plucking the Contents from the Highlighted object but when I check it returning me nil as there is no such element in the object here is my algo which I used to get the highlighted objects from the pdf def read_pdf puts

问题 I am using pdf-reader for parsing the pdf and converting it to the object and plucking out the Highlight and underlined object from the pdf but the problem I am not able to pluck out the text from that object I checked other algo to for the reference and found that they are plucking the Contents from the Highlighted object but when I check it returning me nil as there is no such element in the object here is my algo which I used to get the highlighted objects from the pdf def read_pdf puts

问题 routes.rb: resources :courses, path: '' do resources :students do resources :awards end end students/show.html.erb <%= form_for [@course, @student, @award] do |f| %> <div class="field"> <%= f.label :ticket %><br> <%= f.text_field :ticket %> </div> <div class="actions"> <%= f.submit %> </div> <% end %> models/student.rb belongs_to :course has_many :awards, dependent: :destroy extend FriendlyId friendly_id :uuid, use: [ :slugged, :finders ] controllers/students_controller.rb before_action :set

问题 Sometimes my EC2 server is down. I never figured out the reason. But these days after some deployments actions, the server is down. And is down after the deploy. I have a lot of assets to precompile and the deploy takes too long. I went to the monitoring areas on EC2 dashboard and the: CPU usage (Instance) Latency (ELB) Network In/Out (Instance) Is with higher values. See the prints: Then, I installed a gem Capistrano Faster Assets, to avoid capistrano precompile assets that is not modified.

问题 Why does this create method make a nil record? I have tried: Dropdown.create(subject: "test") Dropdown.create({subject: "test", subject_value: "1"}) Dropdown.create({:subject => "test", :subject_value => "1"}) All result in nil records. (0.1ms) begin transaction SQL (0.6ms) INSERT INTO "dropdowns" ("created_at", "updated_at") VALUES (?, ?) [["created_at", "2016-01-21 23:58:04.979225"], ["updated_at", "2016-01-21 23:58:04.979225"]] (2.1ms) commit transaction => #<Dropdown id: 145, subject: nil

问题 I have the following migration class LinkDoctorsAndSpecializations < ActiveRecord::Migration def up add_reference :doctors, :doctor_specialization, polymorphic: true, index: true end def down remove_reference :doctors, :doctor_specialization, polymorphic: true end end when i run rake db:migrate i am getting the error Index name 'index_doctors_on_doctor_specialization_type_and_doctor_specialization_id' on table 'doctors' is too long; the limit is 63 characters so how can i specify the index

问题 I have the following migration class LinkDoctorsAndSpecializations < ActiveRecord::Migration def up add_reference :doctors, :doctor_specialization, polymorphic: true, index: true end def down remove_reference :doctors, :doctor_specialization, polymorphic: true end end when i run rake db:migrate i am getting the error Index name 'index_doctors_on_doctor_specialization_type_and_doctor_specialization_id' on table 'doctors' is too long; the limit is 63 characters so how can i specify the index

问题 I'm trying to use a block in a helper, but that's giving me this error: SyntaxError - syntax error, unexpected ')' ...rbout.concat(( green_title do ).to_s); _erbout.concat "\n ... ... ^ (erb):4254: syntax error, unexpected end-of-input, expecting ')' ; _erbout.force_encoding(__ENCODING__) ^: (erb):1649:in `' here's how I'm calling it: <%= green_title do %> text <% end %> and here's my helper: def green_title(&block) capture do concat content_tag(:h3) do yeld end end end 回答1: Your block is

问题 I'm trying to use a block in a helper, but that's giving me this error: SyntaxError - syntax error, unexpected ')' ...rbout.concat(( green_title do ).to_s); _erbout.concat "\n ... ... ^ (erb):4254: syntax error, unexpected end-of-input, expecting ')' ; _erbout.force_encoding(__ENCODING__) ^: (erb):1649:in `' here's how I'm calling it: <%= green_title do %> text <% end %> and here's my helper: def green_title(&block) capture do concat content_tag(:h3) do yeld end end end 回答1: Your block is