Types of Relationship in Laravel

-

In Laravel, there are several types of relationships that you can define between your Eloquent models. These relationships allow you to easily manage and query the related data. Here are the main types of relationships:


1. One To One  

   A one-to-one relationship is used to define a relationship where one record in a table is associated with one and only one record in another table.

   Example: A `User` has one `Profile`.


2. One To Many  

   A one-to-many relationship is used to define a relationship where a single record in one table can have multiple related records in another table.

   Example: A `Post` has many `Comments`.


3. Many To One  

   This is the inverse of the one-to-many relationship. It defines a relationship where many records in one table are related to a single record in another table.

   Example: Many `Comments` belong to a single `Post`.


4. Many To Many  

   A many-to-many relationship is used when multiple records in one table are related to multiple records in another table. This is usually implemented with a pivot table.

   Example: A `User` can have many `Roles`, and a `Role` can belong to many `Users`.


5. Has One Through  

   A "has one through" relationship is a one-to-one relationship with an intermediary. It connects two models through another model.

   Example: A `Supplier` has one `User` through an `Account`.


6. Has Many Through  

   A "has many through" relationship provides a way to access a distant relationship via an intermediate relation.

   Example: A `Country` has many `Posts` through a `User`.


7. Polymorphic Relationships  

   Polymorphic relationships allow a model to belong to more than one other model on a single association.


   - One To One (Polymorphic): A model can belong to one of several different models on a single association.

     Example: A `Comment` can be associated with either a `Post` or a `Video`.


   - One To Many (Polymorphic): A model can belong to more than one other model on a single association.

     Example: An `Image` can be associated with either a `Product` or a `User`.


   - Many To Many (Polymorphic): A model can be related to multiple other models through a pivot table.

     Example: A `Tag` can be associated with both `Posts` and `Videos`.


These relationships are defined in the models and used to interact with related data in an intuitive way.

Comments

Post a Comment

Please do not enter any spam link in the comment box.

Popular posts from this blog

WRITE A 8085 ASSEMBLY LANGUAGE PROGRAM TO DIVIDE TWO 8-BIT NUMBERS USING 8085 MICROPROCESSOR AND PERFORM THE OPERATION BETWEEN PREDEFINED LOCATION. 3:2

-
  THEORY :       In 8085 microprocessor, There is no division operation. To get the result of the division, we should use the repetitive subtraction method. By using this program, we will get the quotient and the reminder. Here we also can be store the carry value. Then store the value of that performed resultant value. ALGORITHM : Step 1: LXI H,2000h; to point source memory location, register pair H-L is initialized.Step 2: MOV A, M; to move the value of memory to the accumulator.Step 3: INX H; to increment the value by 1 for the H-L register pair.Step 4:  MOV B, M; to move the value of memory to the B register.Step 5: MVI C,00h; to load the value 00h in register C.Step 6: CMP B; to compare the value of the accumulator and the B register.Step 7: JC ; to jump on carry in step 11.Step 8: SUB B; to subtract the accumulator and B register value.Step 9: INR C; to increment the value of C register.Step 10: JMP; to jump on step 6 Step 11: INX H; to incre...
Read more

Template of Survey papers

-
Image
  Template for submission of Survey papers for           Literature survey (PaperCode) First A. Author, Second B. Author, Jr., and Third C. Author F. A. Author, Paper Name, Department of Computational Science, University, India ( e-mail: author1@ xyz.com). S. A. Author, Paper Name,  Department of Computational Science,University, India ( e-mail: author2@ xyz.com). T. A. Author, Paper Name , Department of Computational Science, University, India ( e-mail: author3@ xyz.com).     ABSTRACT Fill the text from your manuscript in different sections as shown below. Fill the text from your manuscript in different sections as shown below. Fill the text from your manuscript in different sections as shown below. Fill the text from your manuscript in different sections. Fill the text from your manuscript in different sections. Fill the text from your manuscript in different sections. Fill the text from your manuscript in different...
Read more

OPERATING SYSTEM MCQ

-
  Which of the following is an example of a spooled device? a. A line printer used to print the output of a number of jobs. b. The terminal used to enter the input data for a Fortran program being executed. c. The secondary memory device in a virtual memory system. d. The swapping area on a disk used by the swapper. In spooling (Simultaneous Peripheral Operation On Line), a buffer is interposed between a running program and a slow-speed device involved with the program for input/output. For example, instead of writing lines directly to the line printer, the lines are written (temporarily) onto a disk. Thus, the program is allowed to run to completion without waiting for the (slow) printer to finish. When the printer becomes free, the lines can be printed from the disk file. 2. Which of the following is not normally contained in the directory entry of a file? a. Creation date. b. Access control list. c. A count of the number of free blocks in the disk. d. Filename an...
Read more

INTERVIEW ENGLISH QUESTIONS

-
Image
  The new normal has also had positive impacts in my life. My friends see me as…….. One should spend at least half an hour everyday on hobbies for a better professional career. All of us should have goals in life to achieve success. A person who has a better EQ will achieve more success in professional life. It is difficult to enjoy work because end of the day it is monotonous. Happy customers and happy employees together make a successful company. Risk is nothing but better and newer ways of doing things. Continuous learning is absolutely essential to survive and sustain in the corporate sector. A successful career is a sum total of talent, hard work and opportunities. In this Globalization, Every company wants to spread its own business. Maybe they build a relationship with foreign companies. In this situation, English communication skills are helpful. এই বিশ্বায়নে, প্রতিটি সংস্থা নিজস্ব ব্যবসা ছড়িয়ে দিতে চায়। তারা বিদেশী সংস্থার সা...
Read more

Crud of books

-
 books/index.php <!-- resources/views/books/index.blade.php --> <x-app-layout>     <div class="container mx-auto p-4">         <div class="flex justify-between items-center mb-4">             <h1 class="text-2xl font-bold">Books</h1>             <!-- Search Form -->             <form method="GET" action="{{ route('books.index') }}" class="flex items-center space-x-2">                 <input type="text" name="search" value="{{ request('search') }}" placeholder="Search by title or author" class="px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 sm:text-sm">                 <button type="submit" class="bg-blue-500 text-white px-4 py-2 rounded">Search</button...
Read more

AUTOMATA DEFINITIONS

-
 AUTOMATA DEFINITIONS THIS SUBJECT IS FULLY BASED ON EXAMPLES, DEFINITIONS, GRAMMAR RULES, DIAGRAMS AND THEOREMS. IMPORTANT DEFINITIONS:  DFA:    A Deterministic Finite State Automaton (DFSA) is denoted by M and it is a set of 5-tuples i.e. M=(Q, Σ, δ, q 0 , F) where, * Q is a non-empty finite set of states * Σ is a non-empty finite set of input symbols *  q 0 is the initial state or starting state. (q0 ∈ Q) * F is a non-empty finite set of final state. (F ⊆ Q). * δ (pronounce delta) is the transition function. Q x Σ → Q. δ(q,a) = p means, if  the automation is in state q and reading a symbol a, it goes to state p in the next instant, moving the pointer one cell to the right. NDFA:    A Non-Deterministic Finite State Automaton (NFSA) is denoted by M and it is a set of 5-tuples i.e. M=(Q, Σ, δ, q 0 , F) where, * Q is a non-empty finite set of states * Σ is a non-empty finite set ...
Read more

DMA IN MP

-
  What is DMA and Why it is used? Direct memory access (DMA) is a mode of data transfer between the memory and I/O devices. This happens without the involvement of the processor. We have two other methods of data transfer, programmed I/O and Interrupt driven I/O. Let’s revise each and get acknowledge with their drawbacks. In programmed I/O, the processor keeps on scanning whether any device is ready for data transfer. If an I/O device is ready, the processor fully dedicates itself in transferring the data between I/O and memory. It transfers data at a high rate, but it can’t get involved in any other activity during data transfer. This is the major drawback of programmed I/O. In Interrupt driven I/O, whenever the device is ready for data transfer, then it raises an interrupt to processor. Processor completes executing its ongoing instruction and saves its current state. It then switches to data transfer which causes a delay. Here, the processor doesn’t keep scanning for periphe...
Read more

C++ Interview Questions

-
Image
          C++ Interview Questions 2 1) What is C++? 2 2) What are the advantages of C++? 2 3) What is the difference between C and C++? 3 4) What is the difference between reference and pointer? 4 5) What is a class? 5 6) What are the various OOPs concepts in C++? 5 Note: The visibility-mode can be public, private, protected. 7 7) What are the different types of polymorphism in C++? 8 8) Define namespace in C++. 12 9) Define token in C++. 14 10) Who was the creator of C++? 14 11) Which operations are permitted on pointers? 14 12) Define 'std'. 16 13) Which programming language's unsatisfactory performance led to the discovery of C++? 16 14) How delete [] is different from delete? 16 15) What is the full form of STL in C++? 16 16) What is an object? 16 17) What are the C++ access specifiers? 17 18) What is Object Oriented Programming (OOP)? 17 19) What is the difference between an array and a list? 18 20) What is the...
Read more

Java Interview Questions

-
  Java Interview Questions 1. What are the differences between C++ and Java? C++ is not platform-independent; the principle behind C++ programming is “write once, compile anywhere.” In contrast, because the byte code generated by the Java compiler is platform-independent, it can run on any machine, Java programs are written once and run everywhere. ·         Languages Compatibility. C++ is a programming language that is based on the C programming language . Most other high-level languages are compatible with C++. Most of the languages of Java are incompatible. Java is comparable to those of C and C++. ·         Interaction with the library. It can access the native system libraries directly in C++. As a result, it’s better for programming at the system level. Java’s native libraries do not provide direct call support. You can use Java Native Interface or access the libraries. ·         Characteristics. C++ distinguishes it...
Read more