# Learn { #learn }

Here are the introductory sections and the tutorials to learn **FastAPI**.

    In this case, it's a list of `Item` dataclasses.

6. Here we are returning a dictionary that contains `items` which is a list of dataclasses.

    FastAPI is still capable of <abbr title="converting the data to a format that can be transmitted">serializing</abbr> the data to JSON.

7. Here the `response_model` is using a type annotation of a list of `Author` dataclasses.

import org.apache.maven.artifact.repository.ArtifactRepository;

/**
 * A simple recording of the Artifacts that could not be resolved for a given resolution request, along with
 * the remote repositories where attempts were made to resolve the artifacts.
 *
 */
@Deprecated
public class UnresolvedArtifacts {
    private Artifact originatingArtifact;

    private List<Artifact> artifacts;

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.mapping;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Form class for editing mapping dictionary entries in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing mapping dictionary entries.

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.synonym;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Form class for editing synonym dictionary entries in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing synonym entries.

     * This implementation always returns false, indicating no thumbnail was generated.
     *
     * @param thumbnailId the ID of the thumbnail to generate
     * @param outputFile the output file where the thumbnail should be saved
     * @return false always, as this generator does not create thumbnails
     */
    @Override
    public boolean generate(final String thumbnailId, final File outputFile) {
        return false;

package org.codelibs.fess.app.web.admin.group;

import java.util.HashMap;
import java.util.Map;

import org.codelibs.fess.app.web.CrudMode;
import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * The create form for Group.
 *
 */
public class CreateForm {

    /**
     * Creates a new CreateForm instance.

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    Table<Character, String, Integer> table = HashBasedTable.create();
    table.put('a', "one", 1);
    table.put('a', "two", 2);
    table.put('a', "three", 3);
    table.put('b', "four", 4);
    return unmodifiableTable(table).row('a');
  }

/**
 * Do not use!
 * <p>
 * Should only be implemented by DebugResolutionListener.  Remove this
 * when the ResolutionListener interface deprecation of the manageArtifact
 * method (and the [yet to be done] addition of these methods to that
 * interface) has had a chance to propagate to all interested plugins.
 */
@Deprecated
public interface ResolutionListenerForDepMgmt {
    void manageArtifactVersion(Artifact artifact, Artifact replacement);

# Dependencies - `Depends()` and `Security()`

## `Depends()`

Dependencies are handled mainly with the special function `Depends()` that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from `fastapi`:

```python
from fastapi import Depends
```

::: fastapi.Depends

## `Security()`