associations

问题 I have a rather complex mostly-python application (that I inherited) and when I run it in windows from a file type association (double click on a data file in explorer), I get a crash in the middle of the python multiprocessing: Traceback (most recent call last): File "<string>", line 1, in <module> File "c:\Python27\lib\multiprocessing\forking.py", line 380, in main prepare(preparation_data) File "c:\Python27\lib\multiprocessing\forking.py", line 489, in prepare file, path_name, etc = imp

问题 I have Record & Category model: class Record < ActiveRecord::Base belongs_to :category end class Category < ActiveRecord::Base has_many :records end The Category model has a name field which should be used for display. I am using ng-repeat to display the records, the ' record.category.name ' causes my page to break: <tr ng-repeat="record in records"> <td>{{record.category.name)}}</td> <td>{{record.description}}</td> <td>{{record.created_at | date:'medium'}}</td> </tr> How can I properly

问题 I'm trying to learn how to use polymorphic associations in my Rails 5 app. I have models called Organisation, Proposal and Package::Bip. The associations are: Organisation has_many :bips, as: :ipable, class_name: Package::Bip accepts_nested_attributes_for :bips, reject_if: :all_blank, allow_destroy: true Proposal has_many :bips, as: :ipable, class_name: Package::Bip accepts_nested_attributes_for :bips, reject_if: :all_blank, allow_destroy: true Package::Bip belongs_to :ipable, :polymorphic =>

问题 I'm trying to make an app with Rails 4. I have a project.rb and a project_student_eoi.rb. The associations are: project has many project student eons project student eois belong to project On my project show page, I have a link to a form where students can express interest in joining a project. <% if can? :read, Project && current_user.profile.has_role?(:student) %> <%= link_to 'Join this project', new_project_student_eoi_path %> <% end %> Then on the new page (which nests the form), I have a

问题 I have a Department parent model that is associated with a Product and Document model through a has_many / belongs_to relationship. The Product and Document models are then associated to each other through a has_many :through relationship via a ProductDocuments join model. As part of the associations there is a requirement that the Product and Document models have the same Department parent model when being associated to each other. Right now I'm doing the following:

问题 I am in the process of creating a gem which needs to add associations to some models defined by the user. I have an initialiser file which can be copied into the app by a rails generator command and this is where the user will specify the models to add the associations to. BloggyGem.setup do |config| config.user = User config.post = Post end Inside the Gem, I have this specified opts = BloggyGem.settings opts.user.has_many opts.post.to_s.downcase.pluralize.to_sym, :class_name => opts.post

问题 I have 2 models: class Mission < ActiveRecord::Base belongs_to :category end class Category < ActiveRecord::Base has_many :missions end And I have a complex Mission find statement: @missions = Mission.send(@view, level).send(@show).search(@search).paginate :page => params[:page], :order => actual_sort, :per_page => 50 I'd like to add to my query the possibility to search for a specific category too. I tried this but it does not work: @missions = Mission.send(@view, level).send(@show).send(

问题 I've created a database using the EF4 model-first approach. In my model, there's an N-to-M relationship between two entities: I've filled my database with some dummy data, including 3 records of type Diagnosis and 3 records of type TreatmentSchema and associations between them. Here's the code snippet I used to do this: using(var container = new SmartTherapyContainer()) { var diagnosisA = new Diagnosis() { Id = Guid.NewGuid(), Name = "Diagnosis A" }; var diagnosisB = new Diagnosis() { Id =

问题 This is a follow-up to How to I serve data from an object's associations in rails forms? I am wondering, I would like to use eager loading to serve to an edit page of an Article object the tags (as well as other attributes that are saved through associated tables. In the previous question, I was informed that I could use eager loading of associations to pre-load that data. IE in the controller I augment the .find call to include @article = Article.find(params[:id], :include => [:tags]) This

问题 I am creating a game and have come across the need to select the name from a table (Table1) based on the ID value listed in a single row. Example of the row RowID Unit1 Unit2 Unit3 Unit4 And say that row 1 is populated with data for units as wfmatch RowID Unit1 Unit2 Unit3 Unit4 ----- ----- ----- ----- ----- 1 1 2 3 4 Then in my second table ( Table2 ) I have the actual names wfunits UnitID Name ------ ---------- 1 Firstitem 2 Seconditem 3 Thirditem 4 Fourthitem In one query or as close as