The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Posts_Authors_AuthorId" - asp.net

Question

I successfully built migrations, and I am now trying to update the database with my models in Asp.net core but it keeps giving me this error
"The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Posts_Authors_AuthorId". The conflict occurred in database "MediumDb", table "dbo.Authors", column 'AuthorId'.
The statement has been terminated."
This is what the code in my Post class looks like
namespace Medium.Api.Entities
{
public class Post
{
public Guid Id { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int NoOfClaps { get; set; }
public DateTime CreatedDate { get; set; }
public IQueryable<Tag> Tags { get; set; }
public IQueryable<PostTag> PostTags { get; set; }
public string Image { get; set; }
// public string Video { get; set; }
public Author Author { get; set; }
public int AuthorId { get; set; }
while the code in my Author class says this
namespace Medium.Api.Entities
{
public class Author
{
public int AuthorId { get; set; }
public string Name { get; set; }
public IQueryable<Post> Posts { get; set; }
}
}
This is my DbContext configuration
{
public class MediumApiContext : DbContext
{
public MediumApiContext(DbContextOptions options)
: base(options)
{
// Database.EnsureCreated();
}
public DbSet<Post> Posts { get; set; }
public DbSet<Author> Authors { get; set; }
public DbSet<Tag> Tags { get; set; }
public DbSet<PostTag> PostTags { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Author>()
.HasKey(a => a.AuthorId);
modelBuilder.Entity<Author>()
.HasMany(a => a.Posts)
.WithOne(p => p.Author);
modelBuilder.Entity<Post>()
.ToTable("Posts");
modelBuilder.Entity<Post>()
.HasKey(p => p.Id);
modelBuilder.Entity<Post>()
.HasOne(p => p.Author)
.WithMany(a => a.Posts);
modelBuilder.Entity<Post>()
.Property(p => p.CreatedDate)
.IsRequired()
.HasColumnType("Date")
.HasDefaultValueSql("getutcdate()");
modelBuilder.Entity<Post>()
.Property(p => p.Title)
.IsRequired();
modelBuilder.Entity<Post>()
.Property(p => p.NoOfClaps)
.IsRequired();
modelBuilder.Entity<Post>()
.Property(p => p.Content)
.IsRequired();
I don't know where I seem to be getting it all wrong. Please

Answer 1

We Use FK for data integrity right now you have FOREIGN KEY with Author Table so :
"The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Posts_Authors_AuthorId". The conflict occurred in database "MediumDb", table "dbo.Authors", column 'AuthorId'. The statement has been terminated."
This means that when you create a Post, you must give an Author_ID that is on the Author table