.net core entity framework (EF Core) table naming convention

Question

.net core entity framework (EF Core) table naming convention

c# entity-framework entity-framework-core

Question

.net core entity framework (EF Core) table naming convention plural to single/simple/underscore

Being a fan of single simple underscore naming convention to table names, I feel uncomfortable with the way EF core is naming tables Plural PascalCase.

Model

public class SourceType {
   ...

DbContext

public class ApplicationDbContext : DbContext {
    public DbSet<SourceType> SourceTypes { get; set; }
    ...

This creates the table with the name SourceTypes (PascalCase and Plural)

I know I can change the generated table name by using [table('source_type')] in the model class.

But, what I need is a method to do it in global manner.

Faraj Farook

Popular Answer

Faraj's answer not works on ThreeCapitalWords, result is three_capitalwords.

Here is my solution, based on this answer:

    /// <summary>
    ///
    /// </summary>
    /// <param name="preserveAcronyms">If true, 'PrepareXXRecord' converted to 'prepare_xx_record',
    /// otherwise to 'prepare_xxrecord'</param>
    public static void SetSimpleUnderscoreTableNameConvention(this ModelBuilder modelBuilder, bool preserveAcronyms)
    {
        foreach (IMutableEntityType entity in modelBuilder.Model.GetEntityTypes())
        {
            var underscored = AddUndercoresToSentence(entity.DisplayName(), preserveAcronyms);
            entity.Relational().TableName = underscored.ToLower();
        }
    }

    private static string AddUndercoresToSentence(string text, bool preserveAcronyms)
    {
        if (string.IsNullOrWhiteSpace(text))
            return string.Empty;
        var newText = new StringBuilder(text.Length * 2);
        newText.Append(text[0]);
        for (int i = 1; i < text.Length; i++)
        {
            if (char.IsUpper(text[i]))
                if ((text[i - 1] != '_' && !char.IsUpper(text[i - 1])) ||
                    (preserveAcronyms && char.IsUpper(text[i - 1]) &&
                     i < text.Length - 1 && !char.IsUpper(text[i + 1])))
                    newText.Append('_');
            newText.Append(text[i]);
        }
        return newText.ToString();
    }

It also converts acronyms: PrepareXXRecord to prepare_xx_record.

smg

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Faraj Farook · Accepted Answer · 9/16/2016 10:00:48 PM

In short

Extend ModelBuilder with an extension method, do some regex, and call the method in you DbContext

In Detail

Create an extension for ModelBuilder class

public static class ModelBuilderExtensions 
{
    public static void SetSimpleUnderscoreTableNameConvention(this ModelBuilder modelBuilder)
    {
        foreach (IMutableEntityType entity in modelBuilder.Model.GetEntityTypes())
        {                        
            Regex underscoreRegex = new Regex(@"((?<=.)[A-Z][a-zA-Z]*)|((?<=[a-zA-Z])\d+)");            
            entity.Relational().TableName = underscoreRegex.Replace(entity.DisplayName(), @"_$1$2").ToLower();
        }
    }
}

Call this method in you DbContext

public class ApplicationDbContext : DbContext
{
    public DbSet<SourceType> SourceTypes { get; set; }
    ...

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        ...
        builder.SetSimpleUnderscoreTableNameConvention();
    }
}

I hope this will help any developers like me not to waste time searching for the solution. :)

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