The LINQ expression could not be translated with OData and PostgreSQL: matchesPattern filter
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- C#
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Description
Odata Version: 8.2.0
PostgreSQL Version: 13
When using a filter like $filter=matchesPattern(LocationName,‘^.D.$’) to filter a column of type “character varying(100)” in an endpoint that uses ODataQueryOptions.ApplyTo it will always fail with error:
The LINQ expression 'DbSet<StoreLocations>()
.Where(r => Regex.IsMatch(
input: r.LocationName,
pattern: __TypedProperty_0,
options: ECMAScript))' could not be translated. Additional information: Translation of method 'System.Text.RegularExpressions.Regex.IsMatch' failed. If this method can be mapped to your custom function, see https://go.microsoft.com/fwlink/?linkid=2132413 for more information. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.
at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.<VisitMethodCall>g__CheckTranslated|15_0(ShapedQueryExpression translated, <>c__DisplayClass15_0& )
at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
PostgreSql Table:
CREATE COLLATION IF NOT EXISTS collation_case_insensitive (provider = icu, locale = 'und-u-ks-level2', deterministic = false);
CREATE TABLE IF NOT EXISTS public."StoreLocations"
(
"LocationName" character varying(100) COLLATE "collation_case_insensitive"
)
C#:
public Task<IQueryable<StoreLocations>> GetAllLocations(ODataQueryOptions options)
{
return Task.FromResult(options.ApplyTo(_dbContext. StoreLocations.AsNoTracking(), ignoreQueryOptions).Cast<StoreLocations >());
}
Request URL:
https://localhost:8443/storelocationssearch/$query
Payload:
{
"$FILTER":"matchesPattern(LocationName,‘^.*D.*$’)"
}
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the request against the StoreLocations endpoint using ODataQueryOptions.ApplyTo and the PostgreSQL schema shown. Trace how the matchesPattern filter becomes Regex.IsMatch and determine where translation fails; done means the filter executes without the reported LINQ translation error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, postgresql
- Domain
- api, backend, databases
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100