many-to-many

问题 What is the method to save and update Many to Many relationship in Yii framework? 回答1: There is a better implementation as behavior. http://www.yiiframework.com/forum/index.php?/topic/6905-please-test-my-ar-enhancement-automatically-sync-many-many-table-when-calling-save/ 回答2: Unless you create a model for the table between the two main tables, your only option is to use DAO (Database Access Object) and specify SQLs with it. Have a look at how blog demo accomplishes this task. 回答3: use MANY

问题 When having a fully fledged many-to-many with all relations described, the deletion of one of the two main objects crashes. Description Car ( .car_ownerships ) <-> ( .car ) CarOwnership ( .person ) <-> ( .car_ownerships ) Person Car ( .people ) <-----------------> ( .cars ) Person Problem When deleting a Car or a Person SA first deletes the association object CarOwnership (because of the 'through' relationship with the secondary argument) and then tries to update the foreign keys to NULL in

问题 When having a fully fledged many-to-many with all relations described, the deletion of one of the two main objects crashes. Description Car ( .car_ownerships ) <-> ( .car ) CarOwnership ( .person ) <-> ( .car_ownerships ) Person Car ( .people ) <-----------------> ( .cars ) Person Problem When deleting a Car or a Person SA first deletes the association object CarOwnership (because of the 'through' relationship with the secondary argument) and then tries to update the foreign keys to NULL in

问题 I have been trying to figure this one out for a few days now. I am using Rails 4 (with the updated mass assignment technique) and trying to use nested attributes with a many-to-many relationship. My record is saving to the DB but everything is nil and I'm getting an "Unpermitted parameters: school, alumnis, prospects" error in my logs. Here's what I have: referral.rb class Referral < ActiveRecord::Base belongs_to :school belongs_to :alumni belongs_to :prospect end alumni.rb class Alumni <

问题 I'm seeing all sorts of different ways to handle many to many relationships in Yii. However, the examples I'm seeing aren't fully fleshed out and I feel like I'm missing something. For instance, Larry Ullman's tutorial doesn't use the self::MANY_MANY relation - http://www.larryullman.com/2010/08/10/handling-related-models-in-yii-forms/ So as far as adding and retrieving records, whats the standard way for handling Many to Many in the Model, Controller and View? clarification: I suppose Im

问题 I'm trying to update a Customer in my database using ASP.NET Web API and Entity Framework 5 code-first, but it's not working. My entities look like this: public class CustomerModel { public int Id { get; set; } public string Name { get; set; } // More fields public ICollection<CustomerTypeModel> CustomerTypes { get; set; } } public class CustomerTypeModel { public int Id { get; set; } public string Type { get; set; } [JsonIgnore] public ICollection<CustomerModel> Customers { get; set; } }

问题 I have a many-to-many (developers & projects) relationship modeled using SA's association_proxy . The collections (developers on each project & projects for each developer) work fine, but I need to filter on an attribute of the association itself (status). Something like this (which does not work): activeDevelopers = s.query(Developer).filter_by(Developer.developerProjects.status == 'active').all() What am I missing? Here is the complete test code: import logging from sqlalchemy import create

问题 I'm trying to insert values into a many2many or one2manhy relation table in odoo (former OpenERP). Do you have any idea how to do this? 回答1: Here's an example from the stock module: invoice_line_id = invoice_line_obj.create(cursor, user, { 'name': name, 'origin': origin, 'invoice_id': invoice_id, 'uos_id': uos_id, 'product_id': move_line.product_id.id, 'account_id': account_id, 'price_unit': price_unit, 'discount': discount, 'quantity': move_line.product_uos_qty or move_line.product_qty,

问题 I'm trying to insert values into a many2many or one2manhy relation table in odoo (former OpenERP). Do you have any idea how to do this? 回答1: Here's an example from the stock module: invoice_line_id = invoice_line_obj.create(cursor, user, { 'name': name, 'origin': origin, 'invoice_id': invoice_id, 'uos_id': uos_id, 'product_id': move_line.product_id.id, 'account_id': account_id, 'price_unit': price_unit, 'discount': discount, 'quantity': move_line.product_uos_qty or move_line.product_qty,

问题 I'm trying to insert values into a many2many or one2manhy relation table in odoo (former OpenERP). Do you have any idea how to do this? 回答1: Here's an example from the stock module: invoice_line_id = invoice_line_obj.create(cursor, user, { 'name': name, 'origin': origin, 'invoice_id': invoice_id, 'uos_id': uos_id, 'product_id': move_line.product_id.id, 'account_id': account_id, 'price_unit': price_unit, 'discount': discount, 'quantity': move_line.product_uos_qty or move_line.product_qty,