feat: improved oneOf support

Thanks to @znewsham for initial work on this

fixes #428
fixes #410
fixes #112
fixes #68

src/SimpleSchema.ts

@@ -289,6 +289,33 @@ class SimpleSchema {
     return keySchema
   }
 
+  /**
+   * @param key One specific or generic key for which to get all possible schemas.
+   * @returns An potentially empty array of possible definitions for one key
+   *
+   * Note that this returns the raw, unevaluated definition object. Use `getDefinition`
+   * if you want the evaluated definition, where any properties that are functions
+   * have been run to produce a result.
+   */
+  schemas (key: string): StandardSchemaKeyDefinition[] {
+    const schemas: StandardSchemaKeyDefinition[] = []
+
+    const genericKey = MongoObject.makeKeyGeneric(key)
+    const keySchema = genericKey == null ? null : this._schema[genericKey]
+    if (keySchema != null) schemas.push(keySchema)
+
+    // See if it's defined in any subschema
+    this.forEachAncestorSimpleSchema(
+      key,
+      (simpleSchema, ancestor, subSchemaKey) => {
+        const keyDef = simpleSchema.schema(subSchemaKey)
+        if (keyDef != null) schemas.push(keyDef)
+      }
+    )
+
+    return schemas
+  }
+
   /**
    * @returns {Object} The entire schema object with subschemas merged. This is the
    * equivalent of what schema() returned in SimpleSchema < 2.0
@@ -329,9 +356,45 @@ class SimpleSchema {
     propList?: string[] | null,
     functionContext: Record<string, unknown> = {}
   ): StandardSchemaKeyDefinitionWithSimpleTypes | undefined {
-    const defs = this.schema(key)
-    if (defs == null) return
+    const schemaKeyDefinition = this.schema(key)
+    if (schemaKeyDefinition == null) return
+    return this.resolveDefinitionForSchema(key, schemaKeyDefinition, propList, functionContext)
+  }
+
+  /**
+   * Returns the evaluated definition for one key in the schema
+   *
+   * @param key Generic or specific schema key
+   * @param [propList] Array of schema properties you need; performance optimization
+   * @param [functionContext] The context to use when evaluating schema options that are functions
+   * @returns The schema definition for the requested key
+   */
+  getDefinitions (
+    key: string,
+    propList?: string[] | null,
+    functionContext: Record<string, unknown> = {}
+  ): StandardSchemaKeyDefinitionWithSimpleTypes[] {
+    const schemaKeyDefinitions = this.schemas(key)
+    return schemaKeyDefinitions.map((def) => {
+      return this.resolveDefinitionForSchema(key, def, propList, functionContext)
+    })
+  }
 
+  /**
+   * Resolves the definition for one key in the schema
+   *
+   * @param key Generic or specific schema key
+   * @param schemaKeyDefinition Unresolved definition as returned from simpleSchema.schema()
+   * @param [propList] Array of schema properties you need; performance optimization
+   * @param [functionContext] The context to use when evaluating schema options that are functions
+   * @returns The schema definition for the requested key
+   */
+  resolveDefinitionForSchema (
+    key: string,
+    schemaKeyDefinition: StandardSchemaKeyDefinition,
+    propList?: string[] | null,
+    functionContext: Record<string, unknown> = {}
+  ): StandardSchemaKeyDefinitionWithSimpleTypes {
     const getPropIterator = (obj: Record<string, any>, newObj: Record<string, any>) => {
       return (prop: string): void => {
         if (Array.isArray(propList) && !propList.includes(prop)) return
@@ -362,11 +425,11 @@ class SimpleSchema {
       type: []
     }
 
-    Object.keys(defs).forEach(getPropIterator(defs, result))
+    Object.keys(schemaKeyDefinition).forEach(getPropIterator(schemaKeyDefinition, result))
 
     // Resolve all the types and convert to a normal array to make it easier to use.
-    if (Array.isArray(defs.type?.definitions)) {
-      result.type = defs.type.definitions.map((typeDef) => {
+    if (Array.isArray(schemaKeyDefinition.type?.definitions)) {
+      result.type = schemaKeyDefinition.type.definitions.map((typeDef) => {
         const newTypeDef: SchemaKeyDefinitionWithOneType = {
           type: String // will be overwritten
         }

src/ValidationContext.ts

@@ -3,6 +3,7 @@ import MongoObject from 'mongo-object'
 import doValidation from './doValidation.js'
 import { SimpleSchema } from './SimpleSchema.js'
 import { CleanOptions, ObjectToValidate, ValidationError, ValidationOptions } from './types.js'
+import { looksLikeModifier } from './utility/index.js'
 
 export default class ValidationContext {
   public name?: string
@@ -88,6 +89,17 @@ export default class ValidationContext {
       upsert: isUpsert = false
     }: ValidationOptions = {}
   ): boolean {
+    // First do some basic checks of the object, and throw errors if necessary
+    if (obj == null || (typeof obj !== 'object' && typeof obj !== 'function')) {
+      throw new Error('The first argument of validate() must be an object')
+    }
+
+    if (!isModifier && looksLikeModifier(obj)) {
+      throw new Error(
+        'When the validation object contains mongo operators, you must set the modifier option to true'
+      )
+    }
+
     const validationErrors = doValidation({
       extendedCustomContext,
       ignoreTypes,