How to use the classes.query.Clip.get function in classes

def transformTriggered(self, clip_id):
        """Handle the transform signal when it's emitted"""
        need_refresh = False
        # Disable Transform UI
        if self and self.transforming_clip:
            # Is this the same clip_id already being transformed?
            if not clip_id:
                # Clear transform
                self.transforming_clip = None
                need_refresh = True

        # Get new clip for transform
        if clip_id:
            self.transforming_clip = Clip.get(id=clip_id)

            if self.transforming_clip:
                self.transforming_clip_object = None
                clips = get_app().window.timeline_sync.timeline.Clips()
                for clip in clips:
                    if clip.Id() == self.transforming_clip.id:
                        self.transforming_clip_object = clip
                        need_refresh = True
                        break

        # Update the preview and reselct current frame in properties
        if need_refresh:
            get_app().window.refreshFrameSignal.emit()
            get_app().window.propertyTableView.select_frame(get_app().window.preview_thread.player.Position())

item_id, item_type = self.selected_item.data()

            # Bail if readonly
            if readonly:
                return

            # Get the original data of this item (prior to any updates, for the undo/redo system)
            if not self.original_data:
                # Ignore undo/redo history temporarily (to avoid a huge pile of undo/redo history)
                get_app().updates.ignore_history = True

                # Find this clip
                c = None
                if item_type == "clip":
                    # Get clip object
                    c = Clip.get(id=item_id)
                elif item_type == "transition":
                    # Get transition object
                    c = Transition.get(id=item_id)
                elif item_type == "effect":
                    # Get effect object
                    c = Effect.get(id=item_id)

                if c:
                    if property_key in c.data:
                        # Grab the original data for this item/property
                        self.original_data = c.data

            # Calculate percentage value
            if property_type in ["float", "int"] and property_name != "Track":
                min_max_range = float(property_max) - float(property_min)

log.info("actionPreviousMarker_trigger")

        # Calculate current position (in seconds)
        fps = get_app().project.get(["fps"])
        fps_float = float(fps["num"]) / float(fps["den"])
        current_position = (self.preview_thread.current_frame - 1) / fps_float
        all_marker_positions = []

        # Get list of marker and important positions (like selected clip bounds)
        for marker in Marker.filter():
            all_marker_positions.append(marker.data["position"])

        # Loop through selected clips (and add key positions)
        for clip_id in self.selected_clips:
            # Get selected object
            selected_clip = Clip.get(id=clip_id)
            if selected_clip:
                all_marker_positions.append(selected_clip.data["position"])
                all_marker_positions.append(selected_clip.data["position"] + (selected_clip.data["end"] - selected_clip.data["start"]))

        # Loop through selected transitions (and add key positions)
        for tran_id in self.selected_transitions:
            # Get selected object
            selected_tran = Transition.get(id=tran_id)
            if selected_tran:
                all_marker_positions.append(selected_tran.data["position"])
                all_marker_positions.append(selected_tran.data["position"] + (selected_tran.data["end"] - selected_tran.data["start"]))

        # Loop through all markers, and find the closest one to the left
        closest_position = None
        for marker_position in sorted(all_marker_positions):
            # Is marker smaller than position?

def Volume_Triggered(self, action, clip_ids, position="Entire Clip"):
        """Callback for volume context menus"""
        log.info(action)
        prop_name = "volume"

        # Get FPS from project
        fps = get_app().project.get(["fps"])
        fps_float = float(fps["num"]) / float(fps["den"])

        # Loop through each selected clip
        for clip_id in clip_ids:

            # Get existing clip object
            clip = Clip.get(id=clip_id)
            if not clip:
                # Invalid clip, skip to next item
                continue

            start_of_clip = round(float(clip.data["start"]) * fps_float) + 1
            end_of_clip = round(float(clip.data["end"]) * fps_float) + 1

            # Determine the beginning and ending of this animation
            # ["Start of Clip", "End of Clip", "Entire Clip"]
            start_animation = start_of_clip
            end_animation = end_of_clip
            if position == "Start of Clip" and action in [MENU_VOLUME_FADE_IN_FAST, MENU_VOLUME_FADE_OUT_FAST]:
                start_animation = start_of_clip
                end_animation = min(start_of_clip + (1.0 * fps_float), end_of_clip)
            elif position == "Start of Clip" and action in [MENU_VOLUME_FADE_IN_SLOW, MENU_VOLUME_FADE_OUT_SLOW]:
                start_animation = start_of_clip

# Determine what was changed
        property = self.model.item(item.row(), 0).data()
        property_type = property[1]["type"]
        closest_point_x = property[1]["closest_point_x"]
        previous_point_x = property[1]["previous_point_x"]
        property_key = property[0]
        clip_id, item_type = item.data()

        if property_type == "color":
            # Find this clip
            c = None
            clip_updated = False

            if item_type == "clip":
                # Get clip object
                c = Clip.get(id=clip_id)
            elif item_type == "transition":
                # Get transition object
                c = Transition.get(id=clip_id)
            elif item_type == "effect":
                # Get effect object
                c = Effect.get(id=clip_id)

            if c:
                # Update clip attribute
                if property_key in c.data:
                    log.info("color update: %s" % c.data)

                    # Loop through each keyframe (red, blue, and green)
                    for color, new_value in [("red", new_color.red()), ("blue", new_color.blue()),  ("green", new_color.green())]:

                        # Keyframe

def refreshTriggered(self):
        """Signal to refresh viewport (i.e. a property might have changed that effects the preview)"""

        # Update reference to clip
        if self and self.transforming_clip:
            self.transforming_clip = Clip.get(id=self.transforming_clip.id)

def Align_Triggered(self, action, clip_ids, tran_ids):
        """Callback for alignment context menus"""
        log.info(action)
        prop_name = "position"
        left_edge = -1.0
        right_edge = -1.0

        # Loop through each selected clip (find furthest left and right edge)
        for clip_id in clip_ids:
            # Get existing clip object
            clip = Clip.get(id=clip_id)
            if not clip:
                # Invalid clip, skip to next item
                continue

            position = float(clip.data["position"])
            start_of_clip = float(clip.data["start"])
            end_of_clip = float(clip.data["end"])

            if position < left_edge or left_edge == -1.0:
                left_edge = position
            if position + (end_of_clip - start_of_clip) > right_edge or right_edge == -1.0:
                right_edge = position + (end_of_clip - start_of_clip)

        # Loop through each selected transition (find furthest left and right edge)
        for tran_id in tran_ids:
            # Get existing transition object

def update_clip_data(self, clip_json):
		""" Create an updateAction and send it to the update manager """

		# read clip json
		if not isinstance(clip_json, dict):
			clip_data = json.loads(clip_json)
		else:
			clip_data = clip_json

		# Search for matching clip in project data (if any)
		existing_clip = Clip.get(id=clip_data["id"])
		if not existing_clip:
			# Create a new clip (if not exists)
			existing_clip = Clip()		
		existing_clip.data = clip_data
		existing_clip.save()

log.info(self.preview_thread.current_frame)

        # Calculate current position (in seconds)
        fps = get_app().project.get("fps")
        fps_float = float(fps["num"]) / float(fps["den"])
        current_position = (self.preview_thread.current_frame - 1) / fps_float
        all_marker_positions = []

        # Get list of marker and important positions (like selected clip bounds)
        for marker in Marker.filter():
            all_marker_positions.append(marker.data["position"])

        # Loop through selected clips (and add key positions)
        for clip_id in self.selected_clips:
            # Get selected object
            selected_clip = Clip.get(id=clip_id)
            if selected_clip:
                all_marker_positions.append(selected_clip.data["position"])
                all_marker_positions.append(selected_clip.data["position"] + (selected_clip.data["end"] - selected_clip.data["start"]))

        # Loop through selected transitions (and add key positions)
        for tran_id in self.selected_transitions:
            # Get selected object
            selected_tran = Transition.get(id=tran_id)
            if selected_tran:
                all_marker_positions.append(selected_tran.data["position"])
                all_marker_positions.append(selected_tran.data["position"] + (selected_tran.data["end"] - selected_tran.data["start"]))

        # Loop through all markers, and find the closest one to the right
        closest_position = None
        for marker_position in sorted(all_marker_positions):
            # Is marker smaller than position?