ENH: Collection attachments (#51)

app/mixins/file-upload.js

@@ -0,0 +1,63 @@
+import Ember from 'ember';
+
+const { Mixin, isArray } = Ember;
+const { keys } = Object;
+
+// Portions borrowed from https://github.com/funtusov/ember-cli-form-data
+// (that project has an MIT license listed, but no copyright holder explicitly identified)
+export default Mixin.create({
+  formDataTypes: ['POST', 'PUT', 'PATCH'],
+
+  ajaxOptions(url, type, options) {
+    let data;
+    if (options && 'data' in options) { data = options.data; }
+    let hash = this._super.apply(this, arguments);
+
+    if (typeof FormData !== 'undefined' && data && this.formDataTypes.indexOf(type) >= 0) {
+      hash.processData = false;
+      hash.contentType = false;
+      hash.data = this._getFormData(data);
+    }
+    return hash;
+  },
+
+  getFormFields(data) {
+    this._root = this._root || keys(data)[0];
+    return data[this._root];
+  },
+
+  getFormKey(key) {
+    return `${this._root}[${key}]`;
+  },
+
+  getFormValue(key, value) {
+    return value;
+  },
+
+  _getFormData(data) {
+    let formData = new FormData();
+    const fields = this.getFormFields(data);
+
+    keys(fields).forEach((key) => {
+      this._appendValue(
+        this.getFormValue(key, fields[key]),
+        this.getFormKey(key, fields[key]),
+        formData);
+    });
+    return formData;
+  },
+
+  _appendValue(value, formKey, formData) {
+    if (isArray(value)) {
+      value.forEach((item) => {
+        this._appendValue(item, `${formKey}[]`, formData);
+      });
+    } else if (value && value.constructor === Object) {
+      keys(value).forEach((key) => {
+        this._appendValue(value[key], `${formKey}[${key}]`, formData);
+      });
+    } else if (typeof value !== 'undefined'){
+      formData.append(formKey, value === null ? '' : value);
+    }
+  },
+});