I am currently learning Laravel, and I have a query regarding the best practice for creating entity relationships whilst writing a migration as I am confused as to how best do this.
Lets say you are writing an entity schema that you know will have a Many to Many relationship or a One to Many relationship or even a foreign key, etc.
Are you meant to code the relationship into the migration itself, or after it?
All the tutorials I've seen up to now seem to gloss over how to make the migration know that Entity A will have relationship with Entity B and put the relationships in the models using hasMany(), etc
This confuses me, are you meant to put the relationship structure into the migration; or is it better to create your migration and then make your relationship in the model?
Thanks now
Related
How to add multiple tables in one model without creating new model.
Is this standard practice to use same in laravel-lumen.
Or should I create 50 models to work on 50 tables.
You can't use multiple table in one model. Each model is written for a specific table.
https://laravel.com/docs/5.7/eloquent#introduction
Laravel uses Eloquent Object Relational Mapper. So each model is like a class representation having methods to do query underneath.
You have to create 50 models if you have 50 tables, or at-least for the tables you are using in your application. TO save time, go for plugins like this which would generate eloquent models based on your database structure. Also check another plugin if it helps.
It's not possible.
Each table should have their own model. But it isn't necessary all the times to make a model for each table. Investing some time on making model will help a lot in future work.
I am trying to build a simple Laravel application. My data model looks like the following:
ENTITIES:
Project, Requirements, ProjectRequirementStatus
RELATIONSHIPS:
A Project has many Requirements
A requirement belongs to many Projects as a "ProjectRequirement"
A "ProjectRequirement" has one ProjectRequirementStatus
A ProjectRequirementStatus belongs to many Projects
TABLES:
projects
requirements
project_requirements
project_requirement_statuses
MODELS:
Project, Requirements, ProjectRequirementStatus
My question IS:
Is it improper to create a model for a relationship class? In this case, I would need to create a ProjectRequirement model and define the relationship to the ProjectRequirementStatus class.
I'm confused because most of my pivot tables include IDs of the two tables they are joining in a Many to Many, and typically, no additional relationships.
Am I thinking about this the wrong way? Are there "best practices" in terms of when a Model is created versus when it's not needed?
Using the 3NF in Laravel, you do not have to make models for the relationships. Laravel provides the Eloquent ORM which will provide the relationships without having to make the pivot tables models.
The Eloquent ORM also provides you a way to access data on pivot tables. (Defining The Inverse Of The Relationship)
I have a doub about Laravel. The models are used to define the relationships between the models like hasMany, belongsTo, etc. Also the models are used to define the fillable fields. But he models are only for that? Because I already check some examples that it seems that some queries are executed in the models instead of the controller so Im not understanding if the models should also have the querying of the relationships or not. Can you give a help to understand better what is the correct use of models (what should be placed in the models)?
Its same way to execute queries on model or controller. Written queries in model make your controller more clean. We can write mutator, accessor or query scope in eloquent model. Correct me if I'm wrong.
Visit https://laravel.com/api/5.5/Illuminate/Database/Eloquent/Model.html
You can refer this documentation, it's quite helpful if you want to know deep basics and responsibilities about particular part in Laravel.
Models are mostly used to make an outlook of the data i.e what fields are going to be saved in the database and we also use it to associate the relationships with other related data as you already know but we also use it to alter the values that are either going in/out of the data base which you can check in the documentation in link bellow https://laravel.com/docs/5.6/eloquent-mutators
the main purpose is to divide the code between controller and model (were it best fit to be)
I have a project and I want to do it, but I got a problem in relationships.
Project Details:
The system consists of a set of courses, each course offered by one or more trainers, and each trainee can enroll in one or more courses.
My question :
How do I make relationships in Laravel? So that I can get all courses of the trainee with the course information and the trainer who provided the course.
My question : How do I make relationships in Laravel?
Laravel uses eloquent to define models and relationships.
In your case, i think you are looking for a One to Many and Many to Many relationship:
Course has many traniners
Trainee belongs to many courses
Course belongs to many trainees
TIP: In Many to Many relationship is needed a third table with both primary key.
Just look the documentation.
https://laravel.com/docs/master/eloquent-relationships
Being new to app design and coding I have the following question related to Class design. I have a class by the name of Art Object which has the following other attributes:
'Type' such as 'Painting', 'Sculpture', 'Drawing', 'Collage' etc.
Categories such as 'Modern (Art Nouveau)', 'Art Deco', 'Gothic' etc.
Now my question is, how do I design this. In my opinion I have two options:
Create a separate model , say ArtObjectTypes and have all the CRUD operations. And then establish relation between ArtObject and ArtObjectType.
Create a separate model , say CustomFields on which I can have all CRUD operations. The benefit in this case is that in future I will be able to generate more custom types attach with the ArtObject or any other Object.
Please advise which of the above options I should go for and why. Also, please do bring up if there is another choice.
First ask yourself how you would organize this in your database.
Draw a schema like this:
Define the relations, the foreign keys, and only then you should start implementing the models. A model in laravel corresponds to a table in your database.