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POEntity frame work: many to many relationship tables
 

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  1. POEntity frame work: many to many relationship tables
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    <p>I have a news entity and I get the news based on their NewsID. Now I defined a new entity , a Group and I want to get the news based on their Group ID. I defined a Group news Table Aslo to relate this to table together. <img src="https://i.stack.imgur.com/fbAwS.png" alt="enter image description here"></p> <p>in news model I have :</p> <pre><code>public virtual ICollection&lt;GroupNews&gt; RelatedGroupID { get; set; } </code></pre> <p>So I Assumed that I defined the GroupNews table values and I can use it in NewsService.</p> <p>Now lets look at NewsService : </p> <pre><code> Expression&lt;Func&lt;News, bool&gt;&gt; constraint = null; if (user_id &gt; 0 &amp;&amp; project_id &gt; 0) { constraint = e =&gt; (e.CreatorID == user_id &amp;&amp; e.RelatedProjectTags.Any(p =&gt; p.ProjectID == project_id)); } else if (user_id &gt; 0) { constraint = e =&gt; (e.CreatorID == user_id); } else if (project_id &gt; 0) { constraint = e =&gt; (e.RelatedProjectTags.Any(p =&gt; p.ProjectID == project_id)); } else { constraint = null; } IEnumerable&lt;News&gt; result_list = null; if (constraint != null) { result_list = newsRepository.GetMany(constraint).OrderByDescending(e =&gt; e.CreatedOn).Skip(offset); } else { result_list = newsRepository.GetAll().OrderByDescending(e =&gt; e.CreatedOn).Skip(offset); } if (count &gt; 0) { result_list = result_list.Take(count); } return result_list.ToList&lt;News&gt;(); } </code></pre> <p>}</p> <p>I add this line to it in order to define a constraint based on GroupID.</p> <pre><code> else if (groupId &gt; 0) { constraint = e =&gt; (e.RelatedGroupID.Any(n =&gt; n.GroupID == groupId)); } </code></pre> <p>it seems wrong and gives me this error :</p> <blockquote> <p>{"Invalid object name 'dbo.GroupNewsNews'."}</p> </blockquote>
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    1. COIf you are doing Code First why don't you let EF generate the database for you. No need to manually create/alter database tables.
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    2. COPlease post you `GroupNews` and `News` classes and your context class.
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      1. USSOfanatic
    3. COBased on your screenshot and the error message, you have your table named `GroupNews`, but EF is trying to find `GroupNewsNews`. You might need to override the table name: `[Table["GroupNews")]`
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