public async Task SeedAsync(BeverageContext context, IHostingEnvironment env, ILogger <BeverageContextSeed> logger)
{
var policy = this.CreatePolicy(logger, nameof(BeverageContextSeed));
await policy.ExecuteAsync(async() =>
{
if (!context.Manufacturers.Any())
{
await context.Manufacturers.AddRangeAsync(this.GetManufacturersFromFile(logger));
await context.SaveChangesAsync();
}
if (!context.BeverageTypes.Any())
{
await context.BeverageTypes.AddRangeAsync(this.GetBeverageTypesFromFile(logger));
await context.SaveChangesAsync();
}
if (!context.BeverageStyles.Any())
{
await context.BeverageStyles.AddRangeAsync(this.GetBeverageStylesFromFile(context, logger));
await context.SaveChangesAsync();
}
if (!context.Beverages.Any())
{
await context.Beverages.AddRangeAsync(this.GetBeveragesFromFile(context, logger));
await context.SaveChangesAsync();
}
});
}
private IEnumerable <Beverage> GetBeveragesFromFile(BeverageContext context, ILogger <BeverageContextSeed> logger)
{
string csvFileBeverages = ResourceHelper.GetManifestResourceAsString($"{BeverageDataNameSpace}.Beverages.csv");
string[] csvheaders = null;
try
{
string[] requiredHeaders = { "name", "description", "alcoholpercent", "volume", "url", "beveragestylename", "beveragetypename", "manufacturername" };
csvheaders = this.GetHeaders(csvFileBeverages, requiredHeaders);
}
catch (Exception ex)
{
logger.LogError(ex.Message);
}
var beverageTypeIdLookup = context.BeverageTypes.ToDictionary(ct => ct.Name, ct => ct.Id);
var beverageStyleIdLookup = context.BeverageStyles.ToDictionary(ct => ct.Name, ct => ct.Id);
var manufacturerIdLookup = context.Manufacturers.ToDictionary(ct => ct.Name, ct => ct.Id);
return(csvFileBeverages.SplitCsvRows()
.Skip(1) // skip header row
.Select(row => Regex.Split(row, ColumnRegexPattern))
.SelectTry(column => this.CreateBeverage(column, csvheaders, beverageTypeIdLookup, beverageStyleIdLookup, manufacturerIdLookup, logger))
.OnCaughtException(ex => { logger.LogError(ex.Message); return null; })
.Where(x => x != null));
}