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diff --git a/collections/cards.js b/collections/cards.js
new file mode 100644
index 00000000..538b6af4
--- /dev/null
+++ b/collections/cards.js
@@ -0,0 +1,287 @@
+Cards = new Mongo.Collection('cards');
+CardComments = new Mongo.Collection('card_comments');
+
+// XXX To improve pub/sub performances a card document should include a
+// de-normalized number of comments so we don't have to publish the whole list
+// of comments just to display the number of them in the board view.
+Cards.attachSchema(new SimpleSchema({
+  title: {
+    type: String
+  },
+  archived: {
+    type: Boolean
+  },
+  listId: {
+    type: String
+  },
+  // The system could work without this `boardId` information (we could deduce
+  // the board identifier from the card), but it would make the system more
+  // difficult to manage and less efficient.
+  boardId: {
+    type: String
+  },
+  coverId: {
+    type: String,
+    optional: true
+  },
+  createdAt: {
+    type: Date,
+    denyUpdate: true
+  },
+  dateLastActivity: {
+    type: Date
+  },
+  description: {
+    type: String,
+    optional: true
+  },
+  labelIds: {
+    type: [String],
+    optional: true
+  },
+  members: {
+    type: [String],
+    optional: true
+  },
+  // XXX Should probably be called `authorId`. Is it even needed since we have
+  // the `members` field?
+  userId: {
+    type: String
+  },
+  sort: {
+    type: Number,
+    decimal: true
+  }
+}));
+
+CardComments.attachSchema(new SimpleSchema({
+  boardId: {
+    type: String
+  },
+  cardId: {
+    type: String
+  },
+  // XXX Rename in `content`? `text` is a bit vague...
+  text: {
+    type: String
+  },
+  // XXX We probably don't need this information here, since we already have it
+  // in the associated comment creation activity
+  createdAt: {
+    type: Date,
+    denyUpdate: false
+  },
+  // XXX Should probably be called `authorId`
+  userId: {
+    type: String
+  }
+}));
+
+if (Meteor.isServer) {
+  Cards.allow({
+    insert: function(userId, doc) {
+      return allowIsBoardMember(userId, Boards.findOne(doc.boardId));
+    },
+    update: function(userId, doc) {
+      return allowIsBoardMember(userId, Boards.findOne(doc.boardId));
+    },
+    remove: function(userId, doc) {
+      return allowIsBoardMember(userId, Boards.findOne(doc.boardId));
+    },
+    fetch: ['boardId']
+  });
+
+  CardComments.allow({
+    insert: function(userId, doc) {
+      return allowIsBoardMember(userId, Boards.findOne(doc.boardId));
+    },
+    update: function(userId, doc) {
+      return userId === doc.userId;
+    },
+    remove: function(userId, doc) {
+      return userId === doc.userId;
+    },
+    fetch: ['userId', 'boardId']
+  });
+}
+
+Cards.helpers({
+  list: function() {
+    return Lists.findOne(this.listId);
+  },
+  board: function() {
+    return Boards.findOne(this.boardId);
+  },
+  labels: function() {
+    var self = this;
+    var boardLabels = self.board().labels;
+    var cardLabels = _.filter(boardLabels, function(label) {
+      return _.contains(self.labelIds, label._id);
+    });
+    return cardLabels;
+  },
+  user: function() {
+    return Users.findOne(this.userId);
+  },
+  activities: function() {
+    return Activities.find({ type: 'card', cardId: this._id },
+                                                    { sort: { createdAt: -1 }});
+  },
+  comments: function() {
+    return CardComments.find({ cardId: this._id }, { sort: { createdAt: -1 }});
+  },
+  attachments: function() {
+    return Attachments.find({ cardId: this._id }, { sort: { uploadedAt: -1 }});
+  },
+  cover: function() {
+    return Attachments.findOne(this.coverId);
+  },
+  absoluteUrl: function() {
+    var board = this.board();
+    return Router.path('Card', {
+      boardId: board._id,
+      slug: board.slug,
+      cardId: this._id
+    });
+  },
+  rootUrl: function() {
+    return Meteor.absoluteUrl(this.absoluteUrl().replace('/', ''));
+  }
+});
+
+CardComments.helpers({
+  user: function() {
+    return Users.findOne(this.userId);
+  }
+});
+
+CardComments.hookOptions.after.update = { fetchPrevious: false };
+Cards.before.insert(function(userId, doc) {
+  doc.createdAt = new Date();
+  doc.dateLastActivity = new Date();
+
+  // defaults
+  doc.archived = false;
+
+  // userId native set.
+  if (! doc.userId)
+    doc.userId = userId;
+});
+
+CardComments.before.insert(function(userId, doc) {
+  doc.createdAt = new Date();
+  doc.userId = userId;
+});
+
+if (Meteor.isServer) {
+  Cards.after.insert(function(userId, doc) {
+    Activities.insert({
+      type: 'card',
+      activityType: 'createCard',
+      boardId: doc.boardId,
+      listId: doc.listId,
+      cardId: doc._id,
+      userId: userId
+    });
+  });
+
+  // New activity for card (un)archivage
+  Cards.after.update(function(userId, doc, fieldNames) {
+    if (_.contains(fieldNames, 'archived')) {
+      if (doc.archived) {
+        Activities.insert({
+          type: 'card',
+          activityType: 'archivedCard',
+          boardId: doc.boardId,
+          listId: doc.listId,
+          cardId: doc._id,
+          userId: userId
+        });
+      } else {
+        Activities.insert({
+          type: 'card',
+          activityType: 'restoredCard',
+          boardId: doc.boardId,
+          listId: doc.listId,
+          cardId: doc._id,
+          userId: userId
+        });
+      }
+    }
+  });
+
+  // New activity for card moves
+  Cards.after.update(function(userId, doc, fieldNames) {
+    var oldListId = this.previous.listId;
+    if (_.contains(fieldNames, 'listId') && doc.listId !== oldListId) {
+      Activities.insert({
+        type: 'card',
+        activityType: 'moveCard',
+        listId: doc.listId,
+        oldListId: oldListId,
+        boardId: doc.boardId,
+        cardId: doc._id,
+        userId: userId
+      });
+    }
+  });
+
+  // Add a new activity if we add or remove a member to the card
+  Cards.before.update(function(userId, doc, fieldNames, modifier) {
+    if (! _.contains(fieldNames, 'members'))
+      return;
+    var memberId;
+    // Say hello to the new member
+    if (modifier.$addToSet && modifier.$addToSet.members) {
+      memberId = modifier.$addToSet.members;
+      if (! _.contains(doc.members, memberId)) {
+        Activities.insert({
+          type: 'card',
+          activityType: 'joinMember',
+          boardId: doc.boardId,
+          cardId: doc._id,
+          userId: userId,
+          memberId: memberId
+        });
+      }
+    }
+
+    // Say goodbye to the former member
+    if (modifier.$pull && modifier.$pull.members) {
+      memberId = modifier.$pull.members;
+      Activities.insert({
+        type: 'card',
+        activityType: 'unjoinMember',
+        boardId: doc.boardId,
+        cardId: doc._id,
+        userId: userId,
+        memberId: memberId
+      });
+    }
+  });
+
+  // Remove all activities associated with a card if we remove the card
+  Cards.after.remove(function(userId, doc) {
+    Activities.remove({
+      cardId: doc._id
+    });
+  });
+
+  CardComments.after.insert(function(userId, doc) {
+    Activities.insert({
+      type: 'comment',
+      activityType: 'addComment',
+      boardId: doc.boardId,
+      cardId: doc.cardId,
+      commentId: doc._id,
+      userId: userId
+    });
+  });
+
+  CardComments.after.remove(function(userId, doc) {
+    var activity = Activities.findOne({ commentId: doc._id });
+    if (activity) {
+      Activities.remove(activity._id);
+    }
+  });
+}