Column "path" is of type ltree but expression is of type text

Question

Column "path" is of type ltree but expression is of type text

.net c# entity-framework-core npgsql postgresql

Question

I use Npgsql.EntityFrameworkCore.PostgreSQL library. How to insert/update ltree column in PostgreSQL table via Entity Framework Core? Database table:

CREATE TABLE Entity (path ltree);

OnModelCreating:

modelBuilder.HasPostgresExtension("ltree");
...
entity.Property(e => e.Path).HasColumnName("path").HasColumnType("ltree");

Entity:

public string Path { get; set; }

And on insert i've got the error:

Npgsql.PostgresException: 42804: column "path" is of type ltree but expression is of type text

Rover

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Shay Rojansky · Accepted Answer · 11/21/2017 8:14:21 PM

Npgsql doesn't currently support the ltree type, since PostgreSQL doesn't provide a binary input/output functions for it (and Npgsql is binary-only by default). The relevant issue is https://github.com/npgsql/npgsql/issues/699.

It still is possible to read and write ltree, like other binary-unsupported types, in text mode when using the ADO.NET API - see the Npgsql FAQ for how to do this. However, you seem to be attempting to use EF Core, where this isn't possible.

Column "path" is of type ltree but expression is of type text

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