Rails属性未保存到数据库

Question

I'm using psql with my rails 4 app.

I have had a working projects model for quite some time, but with a recent change to a model that is entirely unrelated, I now have a problem that means that my project form attributes are not being created. I look in the console and the attributes are marked 'nil' even though I complete them in the new project form.

The form elements are not saving.

I have a projects model controller with permitted params as follows:

  def new
    #authorise @project
    @project = Project.new
    @project.scope = Scope.new
    @project.scope.datum = Datum.new
    @project.scope.material = Material.new
    @project.scope.mentoring = Mentoring.new
    @project.scope.participant = Participant.new
    @project.scope.funding = Funding.new
    @project.scope.ethic = Ethic.new
    @project.scope.group_research = GroupResearch.new
    @project.scope.backgroundip = Backgroundip.new

  end

I have some nested attributes from other models. Project params include both project attributes and nested attributes.

def project_params
      params[:project].permit(
      :title, :description, :video_proposal, :link_to_video_proposal, :draft, 
      :expiry_date_for_sponsor_interest,  :motivation, :approach,
      :results, :completion_date, :start_date, :industry_id, :public, :recurring_project,
      :frequency, :date_for_student_invitation, :date_for_student_interest, :closed, :student_objective, 
      :industry_relevance, :hero_image, :report, :standard_licence, :bespoke_licence, :bespoke_licence_form,
      :research_consulting, :other_outcome,
      scope_attributes: [:data, :materials, :mentoring, :participants, :participants, :funding, :ethics, :group, :project_id,
                         datum_attributes: [:prim_sec, :qual_quant, :survey, :survey_link, :experiment, :other_type, :other_description,
                                           :confidential, :data_description, :scope_id],
                         material_attributes: [:mattype, :description, :scope_id],
                         mentoring_attributes: [:frequency, :description, :scope_id],
                         funding_attributes: [ :expenses, :honorarium, :financing, :currency, :size, :amount_expenses, :amount_honorarium,
                                  :amount_principal_financing, :return_on_finance, :period_of_return, :expense_description, :scope_id],
                         participant_attributes: [ :title, :description, :location, :costs, :participation_cost, :eligibility, :eligibility_criteria,
                            :location_specific, :scope_id, :currency ],
                         group_research_attributes: [:number_of_group_members, :scope_id],
                         ethic_attributes: [:obtained, :date_expected, :ethics_comment, :ethics_policy_link, :scope_id],
                         backgroundip_attributes: [:scope_id, :copyright, :design, :patent, :trademark, :geographical_indication,
                                                   :trade_secret, :other, :identifier_copyright, :identifier_design, :identifier_patent,
                                                   :identifier_trademark, :identifier_geographical_indication, :identifier_trade_secret,
                                                   :identifier_other, :description, :registered_owner, :unregistered_interest, :conditions ]
                        ]
      )

      params.require(:project).permit(:link_to_video_proposal)

    end

I have a project new form which has:

      <%= simple_form_for @project do |f| %>
      <% if @project.errors.any? %>
      <div id="error_explanation">
        <h2>Looks like there might be <%= pluralize(@project.errors.count, "error") %> with this project proposal. Take a look and let us know if we can help to sort them out.</h2>
        <% end %>
        <ul>
          <% @project.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
          <% end %>
        </ul>
      </div>
    </div>
  </div>


  <div class="row">
    <div class="col-md-10 col-md-offset-1">
      <div class="headerquestion-project">Project Overview
      </div>
    </div>
  </div>

  <div class="row">
    <div class="col-md-3 col-md-offset-1">
      <%= f.label  'Project title',   :class => 'question-project' %>
    </div>
    <div class="col-md-7">
      <%= f.input :title, label: false,  placeholder: 'A catchy, relevant title for your project', :input_html => {:style=> 'width: 100%', class: 'response-project'} %>
    </div>
  </div>

When I try to complete the form and press submit, I get an error saying that title cannot be blank. I add a title, press submit and the view does not show the title and the console shows that the title did not save.

Any ideas as to how to fix this issue?

Thank you

Answer 1

You are overriding permitted parameters. You need to write you project_params method something like this:

def project_params
    params.require(:project).permit( 
      ...
      ...
    )
end

Note that I have used params.require(:project) instead of directly accessing params like hash ( params[:project] ) and have removed your last statement from this method which was overriding the permitted parameters.

Another thing, try to avoid using public as an attribute/column name. This is a reserved keyword of ruby.