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try alternate GetExistingRules() query

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per https://stackoverflow.com/a/51931004/2343739

ref #357
This commit is contained in:
Collin M. Barrett 2018-08-20 08:33:04 -05:00
parent 7e85c96b65
commit 4a9bb075d0
1 changed files with 3 additions and 14 deletions
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17
src/FilterLists.Services/Snapshot/SnapshotBatch.cs
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@ -1,5 +1,4 @@
using System;
using System.Collections.Generic;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using FilterLists.Data;
@ -33,23 +32,13 @@ public async Task SaveAsync()
await dbContext.SaveChangesAsync();
}
private IQueryable<Rule> GetExistingRules()
{
var lineRules = lines.Select(l => new Rule {Raw = l});
return dbContext.Rules.Intersect(lineRules, new RuleRawEqualityComparer());
}
private IQueryable<Rule> GetExistingRules() =>
dbContext.Rules.Join(lines, rule => rule.Raw, line => line, (rule, line) => rule);
private List<Rule> CreateNewRules(IQueryable<Rule> existingRules) =>
lines.Except(existingRules.Select(r => r.Raw)).Select(r => new Rule {Raw = r}).ToList();
private void AddSnapshotRules(IQueryable<Rule> rules) =>
snapEntity.AddedSnapshotRules.AddRange(rules.Select(r => new SnapshotRule {Rule = r}));
private class RuleRawEqualityComparer : IEqualityComparer<Rule>
{
public bool Equals(Rule x, Rule y) => x?.Raw == y?.Raw;
public int GetHashCode(Rule obj) => throw new NotImplementedException();
}
}
}