101 行
3.4 KiB
Ruby
101 行
3.4 KiB
Ruby
class PostVersionsController < ApplicationController
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def index
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post_id = params[:post].presence
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tag_id = params[:tag].presence&.to_i
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page = (params[:page].presence || 1).to_i
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limit = (params[:limit].presence || 20).to_i
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page = 1 if page < 1
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limit = 1 if limit < 1
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offset = (page - 1) * limit
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q = PostVersion.joins(<<~SQL.squish)
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LEFT JOIN
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post_versions prev
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ON
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prev.post_id = post_versions.post_id
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AND prev.version_no = post_versions.version_no - 1
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SQL
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.select('post_versions.*',
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'prev.title AS prev_title',
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'prev.url AS prev_url',
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'prev.thumbnail_base AS prev_thumbnail_base',
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'prev.tags_json AS prev_tags_json',
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'prev.video_ms AS prev_video_ms',
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'prev.original_created_from AS prev_original_created_from',
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'prev.original_created_before AS prev_original_created_before')
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q = q.where('post_versions.post_id = ?', post_id) if post_id
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if tag_id
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q = q.where(("JSON_CONTAINS(post_versions.tags_json, JSON_OBJECT('id', :tag_id)) " +
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"OR JSON_CONTAINS(prev.tags_json, JSON_OBJECT('id', :tag_id))"),
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tag_id:)
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end
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count = q.except(:select, :order, :limit, :offset).count
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versions = q.order(Arel.sql('post_versions.created_at DESC, post_versions.id DESC'))
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.limit(limit)
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.offset(offset)
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render json: { versions: serialise_versions(versions), count: }
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end
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private
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def serialise_versions rows
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user_ids = rows.map(&:created_by_user_id).compact.uniq
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users_by_id = User.where(id: user_ids).pluck(:id, :name).to_h
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rows.map do |row|
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cur_tags =
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normalise_json(row.tags_json)
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.map { Post.tag_snapshot_literal(_1) }
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prev_tags =
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(normalise_json(row.attributes['prev_tags_json']) || [])
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.map { Post.tag_snapshot_literal(_1) }
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{ post_id: row.post_id,
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version_no: row.version_no,
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event_type: row.event_type,
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title: { current: row.title, prev: row.attributes['prev_title'] },
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url: { current: row.url, prev: row.attributes['prev_url'] },
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thumbnail: { current: nil, prev: nil },
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thumbnail_base: { current: row.thumbnail_base,
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prev: row.attributes['prev_thumbnail_base'] },
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video_ms: { current: row.video_ms, prev: row.attributes['prev_video_ms'] },
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tags: build_version_tags(cur_tags, prev_tags),
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original_created_from: {
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current: row.original_created_from&.iso8601,
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prev: row.attributes['prev_original_created_from']&.iso8601 },
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original_created_before: {
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current: row.original_created_before&.iso8601,
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prev: row.attributes['prev_original_created_before']&.iso8601 },
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created_at: row.created_at.iso8601,
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created_by_user:
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if row.created_by_user_id
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{ id: row.created_by_user_id,
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name: users_by_id[row.created_by_user_id] }
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end }
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end
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end
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def build_version_tags(cur_tags, prev_tags)
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(cur_tags | prev_tags).map do |name|
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type =
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if cur_tags.include?(name) && prev_tags.include?(name)
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'context'
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elsif cur_tags.include?(name)
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'added'
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else
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'removed'
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end
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{
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name:,
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type:
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}
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end
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end
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end
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