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How to define multiple hasMany relationships of same(parent) type on model?


How to define multiple hasMany relationships of same(parent) type on model?

By : MaidBoggle
Date : November 17 2020, 11:52 AM
I think the issue was by ths following , Ember Data wants to have a foreign key on the belongsTo side so that it can wire up the models in either direction for you. Ember Data does not directly support many-many relationships hence needing a second join model.
This is pretty much in line with how you model data in a SQL database.
code :


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Cake php model relationships difficulty, esp. hasMany Through

Cake php model relationships difficulty, esp. hasMany Through


By : Eddy
Date : March 29 2020, 07:55 AM
will help you If a User can have different Role in different Group something is needed in between, HABTM or hasManyThrough table.
Before Cake version 2.1, it was not possible to have HABTM relation with extra colums, (here below role_id). The column would get lost when saving. This is not the case anymore if you set the unique param to keepExisting, but I prefer the hasManyThrough relation over HABTM. I guess it's a question of taste.
code :
User hasMany GroupRole

GroupRole belongsTo User, GroupRole belongsTo Groups, GroupRole belongsTo Role (GroupRole is hasManyThrough table)

Group hasMany GroupRole, Group belongsTo Department

Department hasMany Group, Department belongsTo District

District hasMany Department
Updating model hasMany relationships in UI

Updating model hasMany relationships in UI


By : Ellie Li
Date : March 29 2020, 07:55 AM
help you fix your problem This is a modelling issue.
You have Container, each of which has many Item... except that what's actually happening is you're using the Item class as your options - this is your catalogue, if you will, and you want to put these items into "slots" which you haven't created a model for.
How to define hasMany relationships with Ember CLI 0.0.39+

How to define hasMany relationships with Ember CLI 0.0.39+


By : user2209118
Date : March 29 2020, 07:55 AM
should help you out The problem was the underscore in the name. It should have been survey-question.coffee. Once I changed that, it could then be used in the hasMany as a string.
code :
`import DS from 'ember-data'`

Survey = DS.Model.extend
  name: DS.attr 'string'
  survey_questions: DS.hasMany 'survey-question', { async: true }
Is it possible to have multiple hasMany relationships using the same model?

Is it possible to have multiple hasMany relationships using the same model?


By : Chris Dopuch
Date : March 29 2020, 07:55 AM
wish helps you sure you can!
use associationKey and the autogenerated stores of the associations
code :
associations: [
            {
                type: 'hasMany',
                model : 'HandSurvey.model.SpecificChemical',
                name  : 'fiberglassResins',
                associationKey : 'fiberglassResins'
            },
            {
                type: 'hasMany',
                model : 'HandSurvey.model.SpecificChemical',
                name  : 'paintsStains',
                associationKey : 'paintsStains'
            },
        ]
    "response" : {
        "fiberglassResins": [
            {
                "id"   : 1
                "name" : "Polyester"

            },
            {
                "id"   : 2
                "name" : "E-Glass"
            }

        ],
        "paintsStains": [
            {
                "id"   : 1
                "name" : "item1"

            },
            {
                "id"   : 2
                "name" : "item2"
            }

        ]
    }
}
Rethinkdb and Thinky how to saveAll on multiple models in a model that has a 'hasMany' relationship where parent model c

Rethinkdb and Thinky how to saveAll on multiple models in a model that has a 'hasMany' relationship where parent model c


By : PalePirate
Date : March 29 2020, 07:55 AM
Hope this helps After posting this question as an issue on the thinky github, I received a solution from the author which is described in the issue. For those that may be searching for the answer here, the summary of the problem is this:
The thinky .saveAll() method used without parameters passed is described as deprecated by the author and should always specify what relations you want to save in order to get the .saveAll() method to recurse properly. Check out the thinky docs on the parameters passed in .saveAll() and also check out the modified code sample posted by neumino to see how this code sample was slightly modified to insert the saveAll parameter and get the proper relations saved.
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