EntityFramework Core database first approach pluralizing table names
In Entity Framework Core v2 they introduced a pluralizer hook. Where you can pluralize or singularize your objects yourself.
You can do it by adding this to your project:
public class MyDesignTimeServices : IDesignTimeServices
{
public void ConfigureDesignTimeServices(IServiceCollection services)
{
services.AddSingleton<IPluralizer, MyPluralizer>();
}
}
public class MyPluralizer : IPluralizer
{
public string Pluralize(string name)
{
return Inflector.Inflector.Pluralize(name) ?? name;
}
public string Singularize(string name)
{
return Inflector.Inflector.Singularize(name) ?? name;
}
}
More info: What's new in EF core 2
You can use this class as your Inflector:
using System.Collections.Generic;
using System.Text.RegularExpressions;
namespace DMP.Generator
{
public static class Inflector
{
#region Default Rules
static Inflector()
{
AddPlural("$", "s");
AddPlural("s$", "s");
AddPlural("(ax|test)is$", "$1es");
AddPlural("(octop|vir|alumn|fung)us$", "$1i");
AddPlural("(alias|status)$", "$1es");
AddPlural("(bu)s$", "$1ses");
AddPlural("(buffal|tomat|volcan)o$", "$1oes");
AddPlural("([ti])um$", "$1a");
AddPlural("sis$", "ses");
AddPlural("(?:([^f])fe|([lr])f)$", "$1$2ves");
AddPlural("(hive)$", "$1s");
AddPlural("([^aeiouy]|qu)y$", "$1ies");
AddPlural("(x|ch|ss|sh)$", "$1es");
AddPlural("(matr|vert|ind)ix|ex$", "$1ices");
AddPlural("([m|l])ouse$", "$1ice");
AddPlural("^(ox)$", "$1en");
AddPlural("(quiz)$", "$1zes");
AddSingular("s$", "");
AddSingular("(n)ews$", "$1ews");
AddSingular("([ti])a$", "$1um");
AddSingular("((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$", "$1$2sis");
AddSingular("(^analy)ses$", "$1sis");
AddSingular("([^f])ves$", "$1fe");
AddSingular("(hive)s$", "$1");
AddSingular("(tive)s$", "$1");
AddSingular("([lr])ves$", "$1f");
AddSingular("([^aeiouy]|qu)ies$", "$1y");
AddSingular("(s)eries$", "$1eries");
AddSingular("(m)ovies$", "$1ovie");
AddSingular("(x|ch|ss|sh)es$", "$1");
AddSingular("([m|l])ice$", "$1ouse");
AddSingular("(bus)es$", "$1");
AddSingular("(o)es$", "$1");
AddSingular("(shoe)s$", "$1");
AddSingular("(cris|ax|test)es$", "$1is");
AddSingular("(octop|vir|alumn|fung)i$", "$1us");
AddSingular("(alias|status)$", "$1");
AddSingular("(alias|status)es$", "$1");
AddSingular("^(ox)en", "$1");
AddSingular("(vert|ind)ices$", "$1ex");
AddSingular("(matr)ices$", "$1ix");
AddSingular("(quiz)zes$", "$1");
AddIrregular("person", "people");
AddIrregular("man", "men");
AddIrregular("child", "children");
AddIrregular("sex", "sexes");
AddIrregular("move", "moves");
AddIrregular("goose", "geese");
AddIrregular("alumna", "alumnae");
AddUncountable("equipment");
AddUncountable("information");
AddUncountable("rice");
AddUncountable("money");
AddUncountable("species");
AddUncountable("series");
AddUncountable("fish");
AddUncountable("sheep");
AddUncountable("deer");
AddUncountable("aircraft");
}
#endregion
private class Rule
{
private readonly Regex _regex;
private readonly string _replacement;
public Rule(string pattern, string replacement)
{
_regex = new Regex(pattern, RegexOptions.IgnoreCase);
_replacement = replacement;
}
public string Apply(string word)
{
if (!_regex.IsMatch(word))
{
return null;
}
return _regex.Replace(word, _replacement);
}
}
private static void AddIrregular(string singular, string plural)
{
AddPlural("(" + singular[0] + ")" + singular.Substring(1) + "$", "$1" + plural.Substring(1));
AddSingular("(" + plural[0] + ")" + plural.Substring(1) + "$", "$1" + singular.Substring(1));
}
private static void AddUncountable(string word)
{
_uncountables.Add(word.ToLower());
}
private static void AddPlural(string rule, string replacement)
{
_plurals.Add(new Rule(rule, replacement));
}
private static void AddSingular(string rule, string replacement)
{
_singulars.Add(new Rule(rule, replacement));
}
private static readonly List<Rule> _plurals = new List<Rule>();
private static readonly List<Rule> _singulars = new List<Rule>();
private static readonly List<string> _uncountables = new List<string>();
public static string Pluralize(this string word)
{
return ApplyRules(_plurals, word);
}
public static string Singularize(this string word)
{
return ApplyRules(_singulars, word);
}
#if NET45 || NETFX_CORE
[MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
private static string ApplyRules(List<Rule> rules, string word)
{
string result = word;
if (!_uncountables.Contains(word.ToLower()))
{
for (int i = rules.Count - 1; i >= 0; i--)
{
if ((result = rules[i].Apply(word)) != null)
{
break;
}
}
}
return result;
}
public static string Titleize(this string word)
{
return Regex.Replace(Humanize(Underscore(word)), @"\b([a-z])",
delegate (Match match)
{
return match.Captures[0].Value.ToUpper();
});
}
public static string Humanize(this string lowercaseAndUnderscoredWord)
{
return Capitalize(Regex.Replace(lowercaseAndUnderscoredWord, @"_", " "));
}
public static string Pascalize(this string lowercaseAndUnderscoredWord)
{
return Regex.Replace(lowercaseAndUnderscoredWord, "(?:^|_)(.)",
delegate (Match match)
{
return match.Groups[1].Value.ToUpper();
});
}
public static string Camelize(this string lowercaseAndUnderscoredWord)
{
return Uncapitalize(Pascalize(lowercaseAndUnderscoredWord));
}
public static string Underscore(this string pascalCasedWord)
{
return Regex.Replace(
Regex.Replace(
Regex.Replace(pascalCasedWord, @"([A-Z]+)([A-Z][a-z])", "$1_$2"), @"([a-z\d])([A-Z])",
"$1_$2"), @"[-\s]", "_").ToLower();
}
public static string Capitalize(this string word)
{
return word.Substring(0, 1).ToUpper() + word.Substring(1).ToLower();
}
public static string Uncapitalize(this string word)
{
return word.Substring(0, 1).ToLower() + word.Substring(1);
}
public static string Ordinalize(this string numberString)
{
return Ordanize(int.Parse(numberString), numberString);
}
public static string Ordinalize(this int number)
{
return Ordanize(number, number.ToString());
}
#if NET45 || NETFX_CORE
[MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
private static string Ordanize(int number, string numberString)
{
int nMod100 = number % 100;
if (nMod100 >= 11 && nMod100 <= 13)
{
return numberString + "th";
}
switch (number % 10)
{
case 1:
return numberString + "st";
case 2:
return numberString + "nd";
case 3:
return numberString + "rd";
default:
return numberString + "th";
}
}
public static string Dasherize(this string underscoredWord)
{
return underscoredWord.Replace('_', '-');
}
}
}
The inflector class can be found here
For scaffolding I use the dotnet ef command.
The following NuGet packages are included in my project:
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.1" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.1" />
</ItemGroup>
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.1" />
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.1" />
</ItemGroup>
You can use Bricelam.EntityFrameworkCore.Pluralizer. To use the package, simply install it. The pluralizer will be used when reverse engineering a model from an existing database.
// Tools > NuGet Package manager > Package Manager Console:
PM> Install-Package Bricelam.EntityFrameworkCore.Pluralizer
Then run your Scaffold-DbContext ... commands. Thats it!
Scaffold-DbContext "ConnectionStr..." Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
Reverse engineering does not currently singularize (is that a word?) table names for entity types, or pluralize them for navigation properties. This is issue #3060. Until then you'll have to manually change them to what you want after generating the code.