skinny.orm.feature.StrongParametersFeature.scala Maven / Gradle / Ivy

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package skinny.orm.feature

import skinny.ParamType

/**
 * Strong parameters support.
 */
trait StrongParametersFeature {

  /**
   * Returns typed value from a strong parameter.
   *
   * @param fieldName field name
   * @param value actual value
   * @param paramType param type definition
   * @return typed value if exists
   */
  protected def getTypedValueFromStrongParameter(fieldName: String, value: Any, paramType: ParamType): Option[Any] = {
    val ParamTypeExtractor = paramType
    Option(value).map {
      case Some(v) => recFlattenOption(getTypedValueFromStrongParameter(fieldName, v, paramType))
      case None => null
      case ParamTypeExtractor(v) => v
      case v: String if v == "" => null
      case v: String => v
      case v => throw new IllegalArgumentException(s"Cannot convert '${v}' to ${paramType} value.")
    }
  }

  /**
   * Returns a recursively flattened version of the passed in argument if it is an Option
   *
   * @param maybeOption an Any that you suspect may be an Option
   * @return recursively flattened version of the passed in argument
   */
  private def recFlattenOption(maybeOption: Any): Any = maybeOption match {
    case Some(x) => recFlattenOption(x)
    case _ => maybeOption // is not something that needs flattening
  }

}