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POEF - altering FK relationships with Fluent Api without dropping DB?
 

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  1. POEF - altering FK relationships with Fluent Api without dropping DB?
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    <p>I've run into the situation many times where I have to add or alter a FK relationship to a code-first migrated database. Take, for example, this model: </p> <pre><code>public sealed class Post : ITenantData { [Key] [Required] public int PostId { get; set; } public int TenantId { get; set; } } </code></pre> <p>In my <code>Tenant</code> <code>EntityTypeConfiguration</code>, I have the following: </p> <pre><code> HasMany(c =&gt; c.Posts) .WithRequired() .HasForeignKey(u =&gt; u.TenantId); </code></pre> <p>This is working as I'd expect - the <code>TenantId</code> column of <code>Posts</code> is used when I query <code>Tenant.Posts</code>. </p> <p>But now I want to add a virtual property from the <code>Post</code> to the <code>Tenant</code>, altering the above model to the following: </p> <pre><code>public sealed class Post : ITenantData { [Key] [Required] public int PostId { get; set; } public int TenantId { get; set; } public virtual Tenant {get; set; } } </code></pre> <p>I update the <code>Post</code> <code>EntityTypeConfiguration</code>:</p> <pre><code> HasRequired(c =&gt; c.Tenant) .WithMany() .HasForeignKey(u =&gt; u.TenantId); </code></pre> <p>And hit <code>update-database</code>. I get an error: </p> <blockquote> <p>The operation failed because an index or statistics with name 'IX_TenantId' already exists on table 'dbo.Post'.</p> </blockquote> <p>In the output, I see this (among other things): </p> <pre><code> CREATE INDEX [IX_TenantId] ON [dbo].[Post]([TenantId]) </code></pre> <p>Followed by the stacktrace. This isn't a huge deal right now because the app is in development and I can just kill the db. Obviously I can't do that in production. How can I perform this simple change via migrations without dropping the db?</p>
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    1. CODid you mean Update-Database or Migrate-Database? Are you using automatic or manual migration? Have you tried -Force option ? If scripting did you consider adding the SQL drop index for the index EF is trying to create?
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    2. CO@philsoady - Sorry, update-database. Automatic migration. I have tried -force. I'm not scripting, relying 100% on EF.
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