'use strict';

/**
 * Represents the comments on a file attachment.
 *
 * FileAttachmentCommentBlock deals with creating and representing comments
 * that exist on a file attachment. It's a base class that is meant to be
 * subclassed.
 */
RB.FileAttachmentCommentBlock = RB.AbstractCommentBlock.extend({
    defaults: _.defaults({
        fileAttachmentID: null,
        diffAgainstFileAttachmentID: null
    }, RB.AbstractCommentBlock.prototype.defaults),

    /**
     * The list of extra fields on this model.
     *
     * These will be stored on the server in the FileAttachmentComment's
     * extra_data field.
     */
    serializedFields: [],

    /**
     * Create a FileAttachmentComment for the given comment ID.
     *
     * The subclass's storeCommentData will be called, allowing additional
     * data to be stored along with the comment.
     *
     * Args:
     *     id (number):
     *         The ID of the comment to instantiate the model for.
     *
     * Returns:
     *     RB.FileAttachmentComment:
     *     The new comment model.
     */
    createComment: function createComment(id) {
        var comment = this.get('review').createFileAttachmentComment(id, this.get('fileAttachmentID'), this.get('diffAgainstFileAttachmentID'));

        _.extend(comment.get('extraData'), _.pick(this.attributes, this.serializedFields));

        return comment;
    }
});

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