Databases
StackOverflow2013
Postsdbo
POHow do I get objects not currently in a mapping table using fluent linq
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow do I get objects not currently in a mapping table using fluent linq
    primarykey
    data
    text
    <p>I'm trying to get all the <code>Catalog</code> objects that currently aren't mapped to a cart using fluent linq. The mapping table <code>cart_catalog_mapping</code> is generated by EF. I use the following domain objects.</p> <p>Cart (removed comments and extra fields that aren't pertinent to the question</p> <pre><code>public partial class Cart : BaseEntity, ILocalizedEntity { public virtual string Name { get; set; } public virtual DateTime OpeningDateUtc { get; set; } public virtual DateTime ClosingDateUtc { get; set; } public virtual bool IsReadonly { get; set; } public virtual bool IsPreviewMode { get; set; } public virtual CustomerRole CustomerType { get; set; } public virtual ICollection&lt;Catalog&gt; Catalogs { get; set; } } </code></pre> <p>Catalog (again removed comments and extra fields that aren't pertinent to the question)</p> <pre><code>public partial class Catalog : BaseEntity, ILocalizedEntity { public virtual string Name { get; set; } public virtual string Code { get; set; } public virtual bool Published { get; set; } public virtual int DisplayOrder { get; set; } } </code></pre> <p>EF5 w/ code first creates the Cart and Catalog table. It also recognizes that the Cart has the list and creates a cart_catalog_mapping table. I'm trying to get all the rows in the <code>Catalog</code> table that don't have a reference in the <code>cart_catalog_mapping</code> table. The SQL I'm envisioning is</p> <pre><code>SELECT * FROM Catalog WHERE Catalog.Id NOT IN (SELECT Catalog_Id FROM cart_catalog_mapping) </code></pre> <p>The fluent linq I've tried to use to get these is the following: public IList GetAllUnassociatedCatalogs() { IRepository _catalogRepository; IRepository _cartRepository;</p> <pre><code> var query = from catalog in _catalogRepository.Table from cart in _cartRepository.Table where !cart.Catalogs.Contains(catalog) select catalog; return query.ToList(); </code></pre> <p>}</p> <p>Unfortunately the returned IList has no elements. (There are currently no rows in the cart or cart_catalog_mapping tables and 3 rows in the catalog table)</p> <p>Almost forgot, the mapping tables</p> <pre><code>public partial class CartMap : EntityTypeConfiguration&lt;Cart&gt; { public CartMap() { this.ToTable("Cart"); this.HasKey(c =&gt; c.Id); this.Property(c =&gt; c.Name).IsRequired().HasMaxLength(100); this.Property(c =&gt; c.IsOnline).IsRequired(); this.HasMany(c =&gt; c.Catalogs) .WithMany() .Map(m =&gt; m.ToTable("Cart_Catalog_Mapping")); } } public partial class CatalogMap : EntityTypeConfiguration&lt;Catalog&gt; { public CatalogMap() { this.ToTable("Catalog"); this.HasKey(c =&gt; c.Id); this.Property(c =&gt; c.Name).IsRequired().HasMaxLength(100); } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMatt R
    1. USMatt R
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. USLéo Davesne
      1. VTFavorite
    2. VO
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. USMatt R
      1. VTBountyStart
    3. VO
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThis would be much easier if you add an additional navigation property `Carts` (no change in the database): then you could just say `from catalog in Catalogs where !catalog.Carts.Any() select catalog`. Is there a reason why you don't have that?
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. UShvd
    2. COIs Carts:Catalogs a many-to-many or is it a one-to-many?
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. USIronMan84
    3. COThis is a one to many relationship in that a Cart can have many catalogs but one catalog can only be associated to a cart
      singulars
      1. POHow do I get objects not currently in a mapping table using fluent linq
      1. USMatt R
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload