public async Task <SyntaxTree> AddNewContext(NewDbContextTemplateModel dbContextTemplateModel)
{
if (dbContextTemplateModel == null)
{
throw new ArgumentNullException(nameof(dbContextTemplateModel));
}
var templateName = "NewLocalDbContext.cshtml";
var templatePath = _filesLocator.GetFilePath(templateName, TemplateFolders);
Contract.Assert(File.Exists(templatePath));
var templateContent = File.ReadAllText(templatePath);
var templateResult = await _templatingService.RunTemplateAsync(templateContent, dbContextTemplateModel);
if (templateResult.ProcessingException != null)
{
throw new InvalidOperationException(string.Format(
MessageStrings.TemplateProcessingError,
templatePath,
templateResult.ProcessingException.Message));
}
var newContextContent = templateResult.GeneratedText;
var sourceText = SourceText.From(newContextContent);
return(CSharpSyntaxTree.ParseText(sourceText));
}
public async Task <ContextProcessingResult> GetModelMetadata(string dbContextFullTypeName, ModelType modelTypeSymbol)
{
Type dbContextType;
SyntaxTree dbContextSyntaxTree = null;
EditSyntaxTreeResult startUpEditResult = new EditSyntaxTreeResult()
{
Edited = false
};
ContextProcessingStatus state = ContextProcessingStatus.ContextAvailable;
var dbContextSymbols = _modelTypesLocator.GetType(dbContextFullTypeName).ToList();
var startupType = _modelTypesLocator.GetType("Startup").FirstOrDefault();
Type modelReflectionType = null;
if (dbContextSymbols.Count == 0)
{
await ValidateEFSqlServerDependency();
// Create a new Context
_logger.LogMessage("Generating a new DbContext class " + dbContextFullTypeName);
var dbContextTemplateModel = new NewDbContextTemplateModel(dbContextFullTypeName, modelTypeSymbol);
dbContextSyntaxTree = await _dbContextEditorServices.AddNewContext(dbContextTemplateModel);
state = ContextProcessingStatus.ContextAdded;
// Edit startup class to register the context using DI
if (startupType != null)
{
startUpEditResult = _dbContextEditorServices.EditStartupForNewContext(startupType,
dbContextTemplateModel.DbContextTypeName,
dbContextTemplateModel.DbContextNamespace,
dataBaseName: dbContextTemplateModel.DbContextTypeName + "-" + Guid.NewGuid().ToString());
}
if (!startUpEditResult.Edited)
{
state = ContextProcessingStatus.ContextAddedButRequiresConfig;
// The created context would anyway fail to fetch metadata with a crypic message
// It's better to throw with a meaningful message
throw new InvalidOperationException(string.Format("{0} {1}", MessageStrings.FailedToEditStartup, MessageStrings.EnsureStartupClassExists));
}
_logger.LogMessage("Attempting to compile the application in memory with the added DbContext");
CompileAndGetDbContextAndModelTypes(dbContextFullTypeName,
modelTypeSymbol.FullName,
c =>
{
c = c.AddSyntaxTrees(dbContextSyntaxTree);
if (startUpEditResult.Edited)
{
c = c.ReplaceSyntaxTree(startUpEditResult.OldTree, startUpEditResult.NewTree);
}
return(c);
},
out dbContextType,
out modelReflectionType);
// Add file information
dbContextSyntaxTree = dbContextSyntaxTree.WithFilePath(GetPathForNewContext(dbContextTemplateModel.DbContextTypeName));
}
else
{
var addResult = _dbContextEditorServices.AddModelToContext(dbContextSymbols.First(), modelTypeSymbol);
if (addResult.Edited)
{
state = ContextProcessingStatus.ContextEdited;
dbContextSyntaxTree = addResult.NewTree;
_logger.LogMessage("Attempting to compile the application in memory with the modified DbContext");
CompileAndGetDbContextAndModelTypes(dbContextFullTypeName,
modelTypeSymbol.FullName,
c =>
{
var oldTree = c.SyntaxTrees.FirstOrDefault(t => t.FilePath == addResult.OldTree.FilePath);
Debug.Assert(oldTree != null);
return(c.ReplaceSyntaxTree(oldTree, addResult.NewTree));
},
out dbContextType,
out modelReflectionType);
}
else
{
_logger.LogMessage("Attempting to compile the application in memory");
CompileAndGetDbContextAndModelTypes(dbContextFullTypeName,
modelTypeSymbol.FullName,
c => { return(c); },
out dbContextType,
out modelReflectionType);
if (dbContextType == null)
{
throw new InvalidOperationException(string.Format(MessageStrings.DbContextTypeNotFound, dbContextFullTypeName));
}
}
}
if (modelReflectionType == null)
{
throw new InvalidOperationException(string.Format(MessageStrings.ModelTypeNotFound, modelTypeSymbol.Name));
}
_logger.LogMessage("Attempting to figure out the EntityFramework metadata for the model and DbContext: " + modelTypeSymbol.Name);
var metadata = GetModelMetadata(dbContextType, modelReflectionType, startupType);
// Write the DbContext/Startup if getting the model metadata is successful
if (dbContextSyntaxTree != null)
{
PersistSyntaxTree(dbContextSyntaxTree);
if (state == ContextProcessingStatus.ContextAdded || state == ContextProcessingStatus.ContextAddedButRequiresConfig)
{
_logger.LogMessage("Added DbContext : " + dbContextSyntaxTree.FilePath.Substring(_applicationInfo.ApplicationBasePath.Length));
if (state != ContextProcessingStatus.ContextAddedButRequiresConfig)
{
PersistSyntaxTree(startUpEditResult.NewTree);
}
else
{
_logger.LogMessage("However there may be additional steps required for the generted code to work properly, refer to documentation <forward_link>.");
}
}
}
return(new ContextProcessingResult()
{
ContextProcessingStatus = state,
ModelMetadata = metadata
});
}