Using a Custom Function to Filter Properties

Oct 13, 2025 by wbrum.org 43 views

Introduction

When working with API resources in a Vue.js application, it's common to encounter situations where you need to display specific data while excluding certain properties. This can be particularly challenging when dealing with complex data structures and multiple API endpoints. In this article, we'll explore how to loop through API resource data in a Vue template and exclude specific properties based on their keys.

Understanding the Problem

Let's assume you're working on a table component using Vue.js, and your application uses Laravel as the backend along with Inertia.js. You have a resource that is returned for displaying a resource, which contains multiple properties. However, you only want to display a subset of these properties in your table component.

Example Use Case

Suppose you have a resource with the following properties:

{
  "id": 1,
  "name": "John Doe",
  "email": "john.doe@example.com",
  "phone": "123-456-7890",
  "address": {
    "street": "123 Main St",
    "city": "Anytown",
    "state": "CA",
    "zip": "12345"
  }
}

In this example, you might want to display the name, email, and phone properties in your table component, but exclude the address property and its nested fields.

Solution: Using Vue's `computed` Property

One way to achieve this is by using Vue's computed property to create a new object that excludes the unwanted properties. Here's an example:

export default {
  data() {
    return {
      resource: {
        id: 1,
        name: "John Doe",
        email: "john.doe@example.com",
        phone: "123-456-7890",
        address: {
          street: "123 Main St",
          city: "Anytown",
          state: "CA",
          zip: "12345"
        }
      }
    };
  },
  computed: {
    filteredResource() {
      return {
        ...this.resource,
        address: undefined
      };
    }
  }
};

In this example, the filteredResource computed property creates a new object that includes all the properties from the original resource object, except for the address property. The ...this.resource syntax is used to spread the properties of the original object into the new object.

Using a Custom Function to Filter Properties

Another approach is to create a custom function that takes the resource object as an argument and returns a new object with the unwanted properties excluded. Here's an example:

export default {
  data() {
    return {
      resource: {
        id: 1,
        name: "John Doe",
        email: "john.doe@example.com",
        phone: "123-456-7890",
        address: {
          street: "123 Main St",
          city: "Anytown",
          state: "CA",
          zip: "12345"
        }
      }
    };
  },
  methods: {
    filterResource(resource) {
      return {
        ...resource,
        address: undefined
      };
    }
  }
};

In this example, the filterResource method takes the resource object as an argument and returns a new object with the address property excluded.

Using a Vue Directive to Filter Properties

If you need to filter properties in multiple places throughout your application, you can create a custom Vue directive to achieve this. Here's an example:

Vue.directive('filter', {
  bind(el, binding) {
    const resource = binding.value;
    const filteredResource = {
      ...resource,
      address: undefined
    };
    el.$data.resource = filteredResource;
  }
});

In this example, the filter directive takes the resource object as an argument and returns a new object with the address property excluded. The el.$data.resource syntax is used to update the resource property on the component's data object.

Conclusion

In this article, we explored how to loop through API resource data in a Vue template and exclude certain properties based on their keys. We discussed three approaches: using Vue's computed property, creating a custom function to filter properties, and using a Vue directive to filter properties. By applying these techniques, you can create a table component that displays only the desired properties from your API resource data.

Example Use Case: Displaying Filtered Resource Data in a Table Component

Here's an example of how you can use the filteredResource computed property to display the filtered resource data in a table component:

<template>
  <table>
    <tr v-for="(value, key) in filteredResource" :key="key">
      <td>{{ key }}</td>
      <td>{{ value }}</td>
    </tr>
  </table>
</template>
<script>
export default 
data() {
return {
resource {
id: 1,
name: "John Doe",
email: "john.doe@example.com",
phone: "123-456-7890",
address: {
street: "123 Main St",
city: "Anytown",
state: "CA",
zip: "12345"

}
};
},
computed: 
filteredResource() {
return {
...this.resource,
address undefined
;
}
}
};
</script>

Q: What is the best approach to exclude certain properties from API resource data in a Vue template?

A: The best approach depends on your specific use case and requirements. However, using Vue's computed property is a popular and efficient way to exclude properties from API resource data. This approach allows you to create a new object that includes only the desired properties, making it easy to display the filtered data in your Vue template.

Q: How do I use Vue's `computed` property to exclude properties from API resource data?

A: To use Vue's computed property to exclude properties from API resource data, you can create a new computed property that returns a new object with the unwanted properties excluded. For example:

export default {
  data() {
    return {
      resource: {
        id: 1,
        name: "John Doe",
        email: "john.doe@example.com",
        phone: "123-456-7890",
        address: {
          street: "123 Main St",
          city: "Anytown",
          state: "CA",
          zip: "12345"
        }
      }
    };
  },
  computed: {
    filteredResource() {
      return {
        ...this.resource,
        address: undefined
      };
    }
  }
};

In this example, the filteredResource computed property creates a new object that includes all the properties from the original resource object, except for the address property.

Q: Can I use a custom function to exclude properties from API resource data?

A: Yes, you can use a custom function to exclude properties from API resource data. This approach is useful when you need to exclude properties based on a specific condition or when you need to perform complex filtering logic. For example:

export default {
  data() {
    return {
      resource: {
        id: 1,
        name: "John Doe",
        email: "john.doe@example.com",
        phone: "123-456-7890",
        address: {
          street: "123 Main St",
          city: "Anytown",
          state: "CA",
          zip: "12345"
        }
      }
    };
  },
  methods: {
    filterResource(resource) {
      return {
        ...resource,
        address: undefined
      };
    }
  }
};

In this example, the filterResource method takes the resource object as an argument and returns a new object with the address property excluded.

Q: Can I use a Vue directive to exclude properties from API resource data?

A: Yes, you can use a Vue directive to exclude properties from API resource data. This approach is useful when you need to exclude properties in multiple places throughout your application. For example:

Vue.directive('filter', {
  bind(el, binding) {
    const resource = binding.value;
    const filteredResource = {
      ...resource,
      address: undefined
    };
    el.$data.resource = filteredResource;
  }
});

In this example, the filter directive takes the resource object as an argument and returns a new object with the address property excluded.

Q: How do I display the filtered resource data in a Vue template?

A: To display the filtered resource data in a Vue template, you can use the v-for directive to loop through the properties of the filtered resource object. For example:

<template>
  <table>
    <tr v-for="(value, key) in filteredResource" :key="key">
      <td>{{ key }}</td>
      <td>{{ value }}</td>
    </tr>
  </table>
</template>
<script>
export default 
data() {
return {
resource {
id: 1,
name: "John Doe",
email: "john.doe@example.com",
phone: "123-456-7890",
address: {
street: "123 Main St",
city: "Anytown",
state: "CA",
zip: "12345"

}
};
},
computed: 
filteredResource() {
return {
...this.resource,
address undefined
;
}
}
};
</script>

In this example, the filteredResource computed property is used to create a new object that excludes the address property. The v-for directive is then used to loop through the properties of the filtered resource object and display them in a table component.

Q: What are some best practices for excluding properties from API resource data in a Vue template?

A: Here are some best practices for excluding properties from API resource data in a Vue template:

Use Vue's computed property to exclude properties from API resource data.
Create a custom function to exclude properties based on a specific condition or when you need to perform complex filtering logic.
Use a Vue directive to exclude properties in multiple places throughout your application.
Use the v-for directive to loop through the properties of the filtered resource object.
Make sure to update the filteredResource computed property whenever the resource object changes.
Use a consistent naming convention for the filteredResource computed property and the resource object.