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POSQL Error: foreign key value cannot be inserted because a corresponding primary key value does not exist
 

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  1. POSQL Error: foreign key value cannot be inserted because a corresponding primary key value does not exist
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    <p>I am creating a Manage Roles - Admin page using standard <code>WebSecurity</code> functionality.</p> <p>I'm getting the this error </p> <blockquote> <p><em>Foreign key value cannot be inserted because a corresponding primary key value does not exist. [Foreign key constraint name = fk_UserId]</em></p> </blockquote> <p>on the following line of code:</p> <pre><code>if(!Roles.IsUserInRole(userNames[0], roleNames[0])){ Roles.AddUsersToRoles(userNames, roleNames); } </code></pre> <p>My understanding that the individual tables should be linked with a <code>userId</code> column. And they are. I am using WebMatrix 2 and the Razor framework for the development.</p> <p>Any ideas or solutions by you SQL Masterminds? Thanks a lot!</p> <p>Below is the code fragment of how I am going about it!</p> <pre><code> @{ var roleName = ""; string[] userNames = new string[1]; string[] roleNames = new string[1]; var db = Database.Open("ResearchA"); var selectQueryString = "SELECT UserId, username FROM [usernames]"; if(IsPost){ // Create new role if(!Request["buttonCreateRole"].IsEmpty()){ roleName=Request["textRoleName"]; if(!Roles.RoleExists(roleName) &amp;&amp; !roleName.IsEmpty()){ Roles.CreateRole(roleName); } } // Delete role if(!Request["buttonDeleteRole"].IsEmpty()){ roleName=Request["textRoleName"]; if(Roles.GetUsersInRole(roleName).Length == 0 &amp;&amp; !roleName.IsEmpty()){ Roles.DeleteRole(roleName, true); } } // Add user to role if(!Request["buttonAddUserToRole"].IsEmpty()){ userNames[0] = Request["selectUserName"]; roleNames[0] = Request["selectRoleName"]; if(!Roles.IsUserInRole(userNames[0], roleNames[0])){ Roles.AddUsersToRoles(userNames, roleNames); } } // Delete user from role if(!Request["buttonDeleteUserFromRole"].IsEmpty()){ userNames[0] = Request["selectUserName"]; roleNames[0] = Request["selectRoleName"]; if(Roles.IsUserInRole(userNames[0], roleNames[0])){ Roles.RemoveUsersFromRoles(userNames, roleNames); } } } } </code></pre>
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    1. COcan you send more onformation, how dose Roles.AddUsersToRoles works? it seems AddUsersToRoles must take user not userName and role[] not roleNames or some thing like that. how is that implemented?
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      1. POSQL Error: foreign key value cannot be inserted because a corresponding primary key value does not exist
      1. USMohsen Heydari
    2. COI'm _guessing_ one of the elements in `userNames` does not exist in the database (in the users table), so the FOREIGN KEY in the junction table (that connects users and roles) gets violated.
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      1. POSQL Error: foreign key value cannot be inserted because a corresponding primary key value does not exist
      1. USBranko Dimitrijevic
    3. COAlso, you are _checking_ just the first user/role, yet _adding_ potentially multiple users to multiple roles. Is that intentional?
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      1. POSQL Error: foreign key value cannot be inserted because a corresponding primary key value does not exist
      1. USBranko Dimitrijevic
 

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