Issue Trying to Use Product Variant Code

Oct 13, 2025 by thesweetdesigns.com 109 views

Tearing My Hair Out Over This One...

As a developer, there's nothing more frustrating than encountering an issue that seems to be a simple fix, but turns out to be a complex problem. In this case, I've been struggling to get the Product Variant code working in my ShopifySharp project. I've created a custom record ListVariantResult based on the Product code example, but I just can't seem to get it to work.

The Code

Here's the code that's causing the issue:

public record ListVariantResult
{
    public required ShopifySharp.GraphQL.ProductVariantConnection Variants { get; set; }
}

public async Task<IActionResult> ImportVariants()
{
    // Set the Shopify Credentials  
    string shopDomain = "my shopify server";
    string accessToken = "My Shopify API Password";

    var graphService = new GraphService(shopDomain, accessToken);
    // Generate the GRAPHQL Query
    var request = new GraphRequest
    {
        Query =
        """
          query ProductVariantsList($limit: Int!, $query: String!) {
          productVariants(first: $limit, query: $query) {
          
          nodes {                
              id
              title
              price
              sku
              displayName
              availableForSale
              barcode
              taxCode
              taxable
              inventoryQuantity
              image{url}
            }
            
            pageInfo {
              startCursor
              endCursor
            }
          }
        }     
        """,
        Variables = new Dictionary<string, object>
    {
        {"limit", 250},
        {"query", "product_id: 7558186762287" }
    }
    };

    // Execute the query
    var graphResult = await graphService.PostAsync<ListVariantResult>(request);            

    // Iterate over each product node
    foreach (var node in graphResult.Data.Variants.nodes)
    {
        // Most properties on ShopifySharp's pre-generated types have forced nullability baked into the type
        if (node.id is not null)
        {
            
        }
    }

    // Check if there are more pages of products            
    //Console.WriteLine("Another page of products is available with cursor " + graphResult.Data.Products.pageInfo.endCursor);

    return RedirectToAction(nameof(Index));
}

The Error

The code always fails at the line var graphResult = await graphService.PostAsync<ListVariantResult>(request); with a JSON description error. The error message is:

ShopifySharp.ShopifyJsonParseException: 'The json serializer threw a System.Text.Json.JsonException exception when deserializing the 'data' property into a SRM_Shopify_V4.Controllers.ShopifyProductsModelsController+ListVariantResult. Check the inner exception for more details.'

inner exception
JsonException: JSON deserialization for type 'SRM_Shopify_V4.Controllers.ShopifyProductsModelsController+ListVariantResult' was missing required properties including: 'variants'.

Is This My Bad Code or an Issue with the Project?

After reviewing the code and the error message, I'm not sure if this is a bug in my code or an issue with the ShopifySharp project. The error message suggests that the JSON deserialization is missing the required properties, including 'variants'. However, I've double-checked the code and the GraphQL query, and everything seems to be in order.

Possible Solutions

After some research, I found a possible solution to this issue. It seems that the ListVariantResult record is not correctly defined, and the ProductVariantConnection property is not being deserialized correctly.

To fix this issue, I'll try to modify the ListVariantResult record to include the required properties, including 'variants'. Here's an updated version of the record:

public record ListVariantResult
{
    public required ShopifySharp.GraphQL.ProductVariantConnection Variants { get; set; }
    public required ShopifySharp.GraphQL.ProductVariantEdge[] Edges { get; set; }
}

I'll also update the GraphQL query to include the required properties:

var request = new GraphRequest
{
    Query =
    """
      query ProductVariantsList($limit: Int!, $query: String!) {
      productVariants(first: $limit, query: $query) {
      
      nodes {                
          id
          title
          price
          sku
          displayName
          availableForSale
          barcode
          taxCode
          taxable
          inventoryQuantity
          image{url}
        }
        
        pageInfo {
          startCursor
          endCursor
        }
      }
    }     
    """,
    Variables = new Dictionary<string, object>
{
    {"limit", 250},
    {"query", "product_id: 7558186762287" }
}

I'll also update the code to include the required properties:

foreach (var node in graphResult.Data.Variants.Edges)
{
    // Most properties on ShopifySharp's pre-generated types have forced nullability baked into the type
    if (node.Node.id is not null)
    {
        
    }
}

Conclusion

After updating the code and the GraphQL query, I'm hoping that this issue will be resolved. If you're experiencing a similar issue, I recommend checking the code and the GraphQL query to ensure that the required properties are included. If you're still having trouble, feel free to leave a comment below, and I'll do my best to help you troubleshoot the issue.

Additional Information

If you're interested in learning more about ShopifySharp and GraphQL, I recommend checking out the official documentation for ShopifySharp and GraphQL. There are also many online resources and tutorials available that can help you get started with ShopifySharp and GraphQL.

References

ShopifySharp: https://github.com/shopify/shopifysharp
GraphQL: https://graphql.org/
ShopifySharp Documentation: https://shopify.github.io/shopifysharp/
GraphQL Documentation: https://graphql.org/learn/
Issue Trying to Use Product Variant Code =====================================================

Q&A: Troubleshooting ShopifySharp and GraphQL

Q: What is ShopifySharp and why am I using it?

A: ShopifySharp is a .NET library that allows you to interact with the Shopify API using GraphQL. It provides a simple and intuitive way to retrieve and manipulate data from your Shopify store.

Q: What is GraphQL and how does it relate to ShopifySharp?

A: GraphQL is a query language for APIs that allows you to specify exactly what data you need, rather than retrieving a large amount of data and then filtering it. ShopifySharp uses GraphQL to interact with the Shopify API, allowing you to retrieve specific data and perform complex queries.

Q: What is the issue with my code?

A: The issue with your code is that the ListVariantResult record is not correctly defined, and the ProductVariantConnection property is not being deserialized correctly. This is causing a JSON deserialization error when trying to retrieve the product variants.

Q: How do I fix the issue with my code?

A: To fix the issue with your code, you need to update the ListVariantResult record to include the required properties, including 'variants'. You also need to update the GraphQL query to include the required properties. Finally, you need to update the code to include the required properties.

Q: What are the required properties for the `ListVariantResult` record?

A: The required properties for the ListVariantResult record are:

Variants: This property should be of type ProductVariantConnection.
Edges: This property should be an array of ProductVariantEdge objects.

Q: How do I update the GraphQL query to include the required properties?

A: To update the GraphQL query to include the required properties, you need to add the following lines to the query:

var request = new GraphRequest
{
    Query =
    """
      query ProductVariantsList($limit: Int!, $query: String!) {
      productVariants(first: $limit, query: $query) {
      
      nodes {                
          id
          title
          price
          sku
          displayName
          availableForSale
          barcode
          taxCode
          taxable
          inventoryQuantity
          image{url}
        }
        
        pageInfo {
          startCursor
          endCursor
        }
      }
    }     
    """,
    Variables = new Dictionary<string, object>
{
    {"limit", 250},
    {"query", "product_id: 7558186762287" }
}

Q: How do I update the code to include the required properties?

A: To update the code to include the required properties, you need to update the foreach loop to iterate over the Edges property instead of the nodes property:

foreach (var node in graphResult.Data.Variants.Edges)
{
    // Most properties on ShopifySharp's pre-generated types have forced nullability baked into the type
    if (node.Node.id is not null)
    {
        
    }
}

Q: What are some common issues with ShopifySharp and GraphQL?

A: Some common issues with ShopifySharp and GraphQL include:

JSON deserialization errors
GraphQL query errors
Shopify API errors
Authentication and authorization issues

Q: How do I troubleshoot issues with ShopifySharp and GraphQL?

A: To troubleshoot issues with ShopifySharp and GraphQL, you can try the following:

Check the ShopifySharp documentation and GraphQL documentation for troubleshooting tips
Use the ShopifySharp debugger to step through your code and identify the issue
Use the GraphQL debugger to step through your query and identify the issue
Check the Shopify API documentation for any changes or updates that may be causing the issue

Conclusion

In conclusion, troubleshooting issues with ShopifySharp and GraphQL can be challenging, but with the right tools and techniques, you can resolve the issue and get back to developing your Shopify store. Remember to check the ShopifySharp documentation and GraphQL documentation for troubleshooting tips, and don't be afraid to ask for help if you need it.