model

问题 How I can optimise my SQL queries, to ignore situations like this: Meeting.find(5).users.size => SELECT COUNT(*) FROM ... WHERE ... User.find(123).meetings.size => SELECT COUNT(*) FROm ... WHERE ... I have no idea how to use counter_cache here. Here is my model relation: class Meeting < ActiveRecord::Base has_many :meeting_users has_many :users, :through => meeting_users end class User < ActiveRecord::Base has_many :meeting_users has_many :meetings, :through => meeting_users end class Meeting

问题 I am finding it difficult to create my own model openNLP. Can any one tell me, how to own model. How the training shouls be done. What should be the input and where the output model file will get stored. 回答1: https://opennlp.apache.org/docs/1.5.3/manual/opennlp.html This website is very useful, shows both in code, and using the OpenNLP application to train models for all different types, like entity extraction and part of speech etc. I could give you some code examples in here, but the page

问题 i'm currently working with Laravel and I'm struggling with the fact that every model needs to extend from Eloquent and I'm not sure how to implement a model Hierarchy (with different tables) For Example: Let's say I have an abstract model Tool , and then a Model Hammer and a Model Screwdriver that extend from Tool. Now, Tool would extend Eloquent ... BUT, there is NO Table for Tools, there is a table for Hammers and another Table for Screwdrivers, because they have different attributes. How

问题 Is there any way to soft delete all the existing rows in a table? I have tried ( Prospect::delete(); ) it deleted all the rows permanently, But it doesn't work in soft deleting. 回答1: If you are using Laravel framework older than 4.2, then you can set the soft delete in your model as, class ModelName extends Eloquent { protected $table = 'table_name'; protected $softDelete = true; } If you are using Laravel framework 4.2, then you can set the soft delete in your model as, use Illuminate

问题 I think this is probably an X Y problem, so I'll give some background info first. I am building an app that can show a "form". The user can fill in the form with some stuff and create some custom things. I think the most suitable thing to do is to use a table view for the form. And I can display all the text boxes that need to be fill in, in each of the table cells. Here's a screenshot: The "Add New Input" button will insert a new cell on the bottom when it is tapped. And if you swipe one of

问题 In user model: var $hasMany = array( 'Photo' => array( 'className' => 'Photo', 'foreignKey' => 'owner_id', ... ), ); In photo model: var $belongsTo = array( 'Owner' => array( 'className' => 'User', 'foreignKey' => 'owner_id', ... ), ); Here one user has many photos. So what my question is that here the alias name is 'Owner', which make me clear to understand the exact meaning of 'User', but is this the only reason to use alias? does it affect 'Photo' in user model? or how to use 'Owner' in/by

问题 Let's say I have a class Employee with a huge amount of fields. And I have a lot of actions related to db with it like CRUD, filter etc. In MVC pattern all of these stuff could be placed into one class of Model part. But again, what if I have a lot of fields and a lot of actions. How to properly split to classes the basic object staff (fields, basic methods: getters & setters, toString etc.) and the actions. Like Employee and EmployeeActions ? Or any best approach? Need your experience) 回答1:

问题 I'm building a profile page that will have a number of sections that relate to a particular model (Tenant) - AboutMe, MyPreferences - those kind of things. Each one of those sections is going to be a partial view, to allow for partial page updates using AJAX. When I click on an ActionResult in the TenantController I'm able to create a strongly typed view and the model data is passed to the view fine. I can't achieve this with partial views. I've created a partial view _TenantDetailsPartial :

问题 I'm building a profile page that will have a number of sections that relate to a particular model (Tenant) - AboutMe, MyPreferences - those kind of things. Each one of those sections is going to be a partial view, to allow for partial page updates using AJAX. When I click on an ActionResult in the TenantController I'm able to create a strongly typed view and the model data is passed to the view fine. I can't achieve this with partial views. I've created a partial view _TenantDetailsPartial :

问题 I have a select field and I want to put a custom attribute at it called name, I tried to do it like that: <%= f.association :in_charge, :collection => User.lawyer.map{ |l| [l.name, l.id, {:name => l.name.downcase}] } %> It works and generates the extra attribute but there is a problem, the select value attribute get changed to the model name attribute, in this case l.name. I changed places and put l.id first but the id attribute is displayed, they get duplicated, any idea why that happens? Is