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POHow do you create a many-to-many relationship in Entity Framework if the database doesn't have a linking table?
 

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  1. POHow do you create a many-to-many relationship in Entity Framework if the database doesn't have a linking table?
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    <p>I am using the VS 2010 Entity Framework designer to modify some of the entities that were auto-generated from a database.</p> <p>The database structure is defined by a product I am building a UI for so I can't modify it.</p> <p>The database has tables that have a many-to-many relationship based purely around common values in non-key columns on both tables.</p> <ul> <li>Table 1 <strong>Users</strong> has a single id column <strong><em>userId</em></strong> and another column called <strong><em>userProfile</em></strong>.</li> <li>Table 2 <strong>SecurityProfile</strong> has a single id column <strong><em>securityProfileId</em></strong> and also has column <strong><em>userProfile</em></strong>.</li> </ul> <p>In other words a User Profile is just a name for a mapping of users to SecurityProfiles.</p> <p>The wizard created entities for both the Users and SecurityProfile tables. I created a new entity called UserProfile with a single key field: <strong>userProfile</strong>.</p> <p>I created a one-to-many association from UserProfile to User and from UserProfile to SecurityProfile. This all works fine except that the UserProfile entity has no table mapping so it won't compile.</p> <p>How do I create this association in Entity Framework?</p> <p><strong>UPDATE:</strong></p> <p>If it's not possible using EF (as is suggested by the first answer), is it possible to manually create a non-bound entity that I can use to link these two entities so that I expose an object model that is at least a little easier to navigate?</p> <p>i.e. I would make the <strong>User</strong> and <strong>SecurityProfile</strong> entities abstract and manually define an extension of these with the appropriate properties pointing to my manually created UserProfile entity</p>
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    1. USAdrian Hope-Bailie
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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.

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