Extract QueryableExtensions into own NuGet package

src/RdbmsEventStore.sln

@@ -25,6 +25,10 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RdbmsEventStore.Tests", "Rd
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RdbmsEventStore.EntityFramework.Tests", "RdbmsEventStore.EntityFramework.Tests\RdbmsEventStore.EntityFramework.Tests.csproj", "{0096C881-9347-454E-B0A0-73C7CABDBF37}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "tlycken.Extensions", "tlycken.Extensions\tlycken.Extensions.csproj", "{3D60C8BA-ACC3-4CBC-B47C-79A504553C93}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "tlycken.Extensions.Tests", "tlycken.Extensions.Tests\tlycken.Extensions.Tests.csproj", "{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -47,13 +51,22 @@ Global
 		{0096C881-9347-454E-B0A0-73C7CABDBF37}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0096C881-9347-454E-B0A0-73C7CABDBF37}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0096C881-9347-454E-B0A0-73C7CABDBF37}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3D60C8BA-ACC3-4CBC-B47C-79A504553C93}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3D60C8BA-ACC3-4CBC-B47C-79A504553C93}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3D60C8BA-ACC3-4CBC-B47C-79A504553C93}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3D60C8BA-ACC3-4CBC-B47C-79A504553C93}.Release|Any CPU.Build.0 = Release|Any CPU
+		{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{E58D4AE3-79B6-4B36-9693-9D852222D06E} = {B3BDC65F-EA8A-4CDC-85FC-0AA1C48C95A8}
 		{0096C881-9347-454E-B0A0-73C7CABDBF37} = {B3BDC65F-EA8A-4CDC-85FC-0AA1C48C95A8}
+		{08FAE0C2-B435-4BA9-8CC4-52EC7FE1EDD6} = {B3BDC65F-EA8A-4CDC-85FC-0AA1C48C95A8}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {CA4860B3-3208-41C0-8FB9-719E00FBAD0D}

src/RdbmsEventStore/RdbmsEventStore.csproj

@@ -22,4 +22,8 @@
     <PackageReference Include="Nito.AsyncEx.Coordination" Version="1.0.2" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\tlycken.Extensions\tlycken.Extensions.csproj" />
+  </ItemGroup>
+
 </Project>

src/tlycken.Extensions.Tests/QueryableExtensions.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Linq;
+using Xunit;
+
+namespace tlycken.Extensions.Tests
+{
+    public class QueryableExtensions
+    {
+        public class Foo
+        {
+            public bool Bar { get; set; }
+        }
+
+        [Fact]
+        public void CanApplyProjectionToQueryables()
+        {
+            var foos = new[] { new Foo { Bar = true }, new Foo { Bar = false }, new Foo { Bar = true } }.AsQueryable();
+
+            var result = foos.Apply(fs => fs.Where(foo => foo.Bar));
+
+            Assert.Equal(2, result.Count());
+        }
+    }
+}

src/tlycken.Extensions.Tests/tlycken.Extensions.Tests.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0-preview-20170628-02" />
+    <PackageReference Include="xunit" Version="2.2.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\tlycken.Extensions\tlycken.Extensions.csproj" />
+  </ItemGroup>
+
+</Project>

src/tlycken.Extensions/FuncExtensions.cs

@@ -0,0 +1,19 @@
+// ReSharper disable once CheckNamespace
+namespace System
+{
+    public static class FuncExtensions
+    {
+        /// <summary>
+        /// Fluently applies the function <paramref name="projection"/> to the argument <paramref name="source"/>.
+        /// </summary>
+        /// <remarks>My main use case for this as an abstraction for queryables, taking a
+        /// <code>Func{IQueryable{S}, IQueryable{T}}</code> as an argument and applying it
+        /// in a longer LINQ method chain.</remarks>
+        /// <typeparam name="S">The element type of the queryable sequence</typeparam>
+        /// <typeparam name="T">The element type of the result</typeparam>
+        /// <param name="source">The source sequence</param>
+        /// <param name="projection">A projection to apply to the <paramref name="source"/> sequence</param>
+        /// <returns>projection(source)</returns>
+        public static T Apply<S, T>(this S source, Func<S, T> projection) => projection(source);
+    }
+}

src/tlycken.Extensions/tlycken.Extensions.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>