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I would like to have 2 node types, Sellers and Products. Each seller can have many products, and each product can have many sellers. Also, the relationship between Sellers and Products would need to contain a price.

What would be the best way to create that relationship, making it easy to list all the Products a seller sells on their page (with prices), as well as listing all of the Sellers selling a product on their page (with prices)?

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You can achieve by these two modules: Field Collection and Entity Reference,

You can create Field Collection field (unlimited instances) to Product, the collection field (act like a wrapper) contains an Entity Reference field references to Seller, and a price field for that seller.

Some screenshot for you:

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  • I really love to see detailed answers like this one, great job (voted up)
    – frazras
    Commented Jul 5, 2012 at 6:15
  • Glad I can help. :)
    – gilzero
    Commented Jul 5, 2012 at 7:51
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    gilder your example worked perfectly. But do you know a way to easily have the associated list of prices/products displayed on the Seller page?
    – Itempo
    Commented Jul 6, 2012 at 21:24
  • gilder -> gilzero, stupid autocorrect :)
    – Itempo
    Commented Jul 6, 2012 at 21:57
  • @itempo. Yes. You can use Views Attachment, or EVA module
    – gilzero
    Commented Jul 7, 2012 at 1:41

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