/// <summary>
/// Saves the state of a recipe to persistent
/// storage.
/// </summary>
/// <param name="recipeEntity">The recipe to persist
/// in storage.</param>
public void Save(RecipeEntity recipeEntity)
{
if (recipeEntity == null)
{
throw new ArgumentNullException("recipe",
"You must specify a recipe to save.");
}
if (recipeEntity.Style == null)
{
throw new InvalidOperationException(
"Recipes require a style.");
}
if (recipeEntity.Contributor == null)
{
throw new InvalidOperationException(
"Recipes require a contributor.");
}
// Load the style assigned to the recipe. We load this because
// it may change from whatthe current db model is.
var existingStyleModel = new Style();
AssignEntityToModel(recipeEntity.Style, existingStyleModel);
this
.Context
.Styles
.Attach(existingStyleModel);
// If it's a new recipe we have to do a decent bit of work.
if (recipeEntity.RecipeId == 0)
{
// Create the recipe.
var newRecipeModel = new Recipe();
// Add the recipe to the context for change tracking.
this.Context.Recipes.Add(newRecipeModel);
// Assumes the user already exists and the domain has validated
// this is the user that created the model
var existingUserModel = new UserProfile();
AssignEntityToModel(recipeEntity.Contributor, existingUserModel);
this
.Context
.UserProfiles
.Attach(existingUserModel);
// Assign the properties that can only be assigned on creation.
newRecipeModel.Style = existingStyleModel;
newRecipeModel.Slug = recipeEntity.Slug;
newRecipeModel.Contributor = existingUserModel;
AssignEntityToModel(recipeEntity, newRecipeModel);
this.Context.SaveChanges();
recipeEntity.RecipeId = newRecipeModel.RecipeId;
return;
}
var recipeModel = this
.Context
.Recipes
.Include("Style")
.Include("Contributor")
.FirstOrDefault(r => r.RecipeId == recipeEntity.RecipeId);
if (recipeModel == null)
{
throw new InvalidOperationException(
"The recipe being modified does not exist.");
}
AssignEntityToModel(recipeEntity, recipeModel);
recipeModel.Style = existingStyleModel;
this.Context.SaveChanges();
}
/// <summary>
/// Assigns the values of a Style entity's
/// properties to the properties of a Style
/// data model.
/// </summary>
/// <param name="style">The Style entity
/// containing the property values to assign.
/// </param>
/// <param name="dbStyle">The Style data
/// model to receive the property values.
/// </param>
private void AssignEntityToModel(StyleEntity style, Style dbStyle)
{
dbStyle.Name = style.Name;
dbStyle.StyleId = style.StyleId;
dbStyle.Category = ConvertToModel(style.Category);
dbStyle.Slug = style.Slug;
}
