options are not shown on react-select

Question

I am using react-select for the select field. When i use normal map function, the options are shown but if I use nested map function it does not list the options.

Here is what I have done

<Field
  name="subjects"
  label="Destination Subjects *"
  component={SelectField}
  isSearchable
  isMulti
  options={get(props, "destinations").map(destination => {
    return preferredDestination.map(pdes => {
      if (destination._id === pdes.name) {
        if (get(destination, "subjects").length > 0) {
          return get(destination, "subjects").map(
            (subject, idx) => {
              console.log("subject", subject); // it gets printed too
              return {
                name: subject.id,
                value: subject.val
              };
            }
          );
        } else {
          return [];
        }
      } else {
        return [];
      }
    });
  })}
/>

This does not list any options but I want options based on certain conditions only.

<Field
  name="subjects"
  label="Destination Subjects *"
  component={SelectField}
  isSearchable
  isMulti
  options={get(props, "destinations").map(destination => {
    return {
      name: destination.name,
      value: destination.value,
    }
  })}
/>

By normal map function i was meant to say the above code. This one works but this is not what I want. I want those items as option which matches the subject for particular selected destination only not the subjects of all the destinations.

How can I now show the options based on the conditions like above?

I am getting the following in options while debugging

Here is the screenshot of what I am getting with vijay's solution

Answer 1

Just make sure the resulting array is one dimensional and use label for name and value for value

Here is the code

<Field
  name="subjects"
  label="Destination Subjects *"
  component={SelectField}
  isSearchable
  isMulti
  options={get(props, "destinations").map(destination => {
    // Don't use second map here 
    // if you're just trying to find the matching element
    // in the second array

    if (
       preferredDestination.findIndex(
        pdes => destination._id === pdes.name
       ) >= 0
    ) {
      if (get(destination, "subjects").length > 0) {
          return get(destination, "subjects").map(
            (subject) => {
              return {
                label: subject.id, // change it to label
                value: subject.val
              };
            }
          );
      }
    }
    // remove unwanted else block
    return null
    })
    .filter(x => x !== null) // remove null elements
    .reduce((a, c) => [...a, ...c], []) // this will convert the 2D array to 1D 
  }
/>