Closes #545 Add option for additional using statements in the entity

src/EntityFrameworkCore.Generator.Core/OptionMapper.cs

@@ -154,6 +154,7 @@ private static void MapEntity(EntityClassOptions option, EntityClass entity)
         option.EntityNaming = entity.EntityNaming;
         option.RelationshipNaming = entity.RelationshipNaming;
         option.PrefixWithSchemaName = entity.PrefixWithSchemaName;
+        option.AdditionalUsings = entity.AdditionalUsings;
 
         MapSelection(option.Renaming, entity.Renaming);
     }

src/EntityFrameworkCore.Generator.Core/Options/EntityClassOptions.cs

@@ -79,4 +79,9 @@ public string BaseClass
     /// The renaming expressions.
     /// </value>
     public SelectionOptions Renaming { get; }
+
+    /// <summary>
+    /// Additional using statements, ;-separated - example: MyLib;MyLib.Data;MyLib.Domain;MyLib.Domain.Interfaces
+    /// </summary>
+    public string AdditionalUsings { get; set; }
 }

src/EntityFrameworkCore.Generator.Core/Serialization/EntityClass.cs

@@ -70,4 +70,9 @@ public EntityClass()
     /// The renaming expressions.
     /// </value>
     public SelectionModel Renaming { get; set; }
+
+    /// <summary>
+    /// Additional using statements, ;-separated - example: MyLib;MyLib.Data;MyLib.Domain;MyLib.Domain.Interfaces
+    /// </summary>
+    public string AdditionalUsings { get; set; }
 }

src/EntityFrameworkCore.Generator.Core/Templates/EntityClassTemplate.cs

@@ -21,6 +21,14 @@ public override string WriteCode()
 
         CodeBuilder.AppendLine("using System;");
         CodeBuilder.AppendLine("using System.Collections.Generic;");
+        if (!Options.Data.Entity.AdditionalUsings.IsNullOrWhiteSpace())
+        {
+            var splittedUsingEntries = Options.Data.Entity.AdditionalUsings.Split(';').Distinct()
+                .Where(s => !s.IsNullOrWhiteSpace());
+
+            foreach (var usingEntry in splittedUsingEntries)
+                CodeBuilder.AppendLine($"using {usingEntry};");
+        }
         CodeBuilder.AppendLine();
 
         CodeBuilder.Append($"namespace {_entity.EntityNamespace}");

test/EntityFrameworkCore.Generator.Core.Tests/Options/full.yaml

@@ -34,6 +34,7 @@ data:
     relationshipNaming: Plural
     document: false
     prefixWithSchemaName: false
+    additionalUsings: ''
     renaming:
       entities:
         - ^(sp|tbl|udf|vw)_