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45b662a1dd
This commit uses a new package that I need to document. It tries to solve the long-standing debate in the Meteor community about allow/deny rules versus methods (RPC). This approach gives us both the centralized security rules of allow/deny and the white-list of allowed mutations similarly to Meteor methods. The idea to have static mutation descriptions is also inspired by Facebook's Relay/GraphQL. This will allow the development of a REST API using the high-level methods instead of the MongoDB queries to do the mapping between the HTTP requests and our collections.
78 lines
2.7 KiB
JavaScript
78 lines
2.7 KiB
JavaScript
Meteor.subscribe('unsaved-edits');
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// `UnsavedEdits` is a global key-value store used to save drafts of user
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// inputs. We used to have the notion of a `cachedValue` that was local to a
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// component but the global store has multiple advantages:
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// 1. When the component is unmounted (ie, destroyed) the draft isn't lost
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// 2. The drafts are synced across multiple computers
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// 3. The drafts are synced across multiple browser tabs
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// XXX This currently doesn't work in purely offline mode since the sync is
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// handled with the DDP connection to the server. To solve this, we could use
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// something like GroundDB that syncs using localstorage.
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//
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// The key is a dictionary composed of two fields:
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// * a `fieldName` which identifies the particular field. Since this is a global
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// identifier a good practice would be to compose it with the collection name
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// and the document field, eg. `boardTitle`, `cardDescription`.
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// * a `docId` which identifies the appropriate document. In general we use
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// MongoDB `_id` field.
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//
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// The value is a string containing the draft.
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UnsavedEdits = {
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// XXX Wanted to have the collection has an instance variable, but
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// unfortunately the collection isn't defined yet at this point. We need ES6
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// modules to solve the file order issue!
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//
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// _collection: UnsavedEditCollection,
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get({ fieldName, docId }, defaultTo = '') {
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const unsavedValue = this._getCollectionDocument(fieldName, docId);
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if (unsavedValue) {
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return unsavedValue.value;
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} else {
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return defaultTo;
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}
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},
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has({ fieldName, docId }) {
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return Boolean(this.get({fieldName, docId}));
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},
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set({ fieldName, docId }, value) {
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const currentDoc = this._getCollectionDocument(fieldName, docId);
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if (currentDoc) {
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UnsavedEditCollection.update(currentDoc._id, { $set: { value }});
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} else {
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UnsavedEditCollection.insert({
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fieldName,
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docId,
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value,
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});
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}
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},
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reset({ fieldName, docId }) {
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const currentDoc = this._getCollectionDocument(fieldName, docId);
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if (currentDoc) {
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UnsavedEditCollection.remove(currentDoc._id);
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}
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},
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_getCollectionDocument(fieldName, docId) {
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return UnsavedEditCollection.findOne({fieldName, docId});
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},
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};
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Blaze.registerHelper('getUnsavedValue', (fieldName, docId, defaultTo) => {
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// Workaround some blaze feature that pass a list of keywords arguments as the
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// last parameter (even if the caller didn't specify any).
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if (!_.isString(defaultTo)) {
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defaultTo = '';
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}
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return UnsavedEdits.get({ fieldName, docId }, defaultTo);
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});
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Blaze.registerHelper('hasUnsavedValue', (fieldName, docId) => {
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return UnsavedEdits.has({ fieldName, docId });
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});
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